646 lines
24 KiB
Objective-C
646 lines
24 KiB
Objective-C
//
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// WRPageView.m
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// WeRead (微信读书)
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//
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// Detailed pseudo-code reconstruction of the page rendering view.
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// This view draws text directly via CoreText into CGContext — no UILabel
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// or UITextView is used for the reading content.
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//
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#import "WRPageView.h"
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#import "WRChapterData.h"
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#import "WRCoreTextLayoutFrame.h"
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#import "WRActivityIndicator.h"
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#import "WRLoadingProgressView.h"
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#import "WRFriendReviewsButton.h"
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// ============================================================================
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#pragma mark - Private Helpers
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// ============================================================================
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/// Extracts a plain-text NSString from a given range of the chapter's
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/// attributed string, stripping any attachment characters.
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static NSString *WRPlainStringFromRange(NSAttributedString *attrStr, NSRange range) {
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if (!attrStr || range.location == NSNotFound) return @"";
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NSString *raw = [[attrStr string] substringWithRange:range];
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// Remove object replacement characters used for image attachments.
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return [raw stringByReplacingOccurrencesOfString:@"" withString:@""];
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}
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/// Converts a UITouch point from view coordinates to the flipped coordinate
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/// system expected by CoreText (origin at bottom-left).
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static CGPoint WRSFlipPointForCoreText(CGPoint viewPoint, CGFloat viewHeight) {
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return CGPointMake(viewPoint.x, viewHeight - viewPoint.y);
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}
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// ============================================================================
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#pragma mark - WRPageView ()
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// ============================================================================
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@interface WRPageView ()
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// ---- Private selection tracking ----
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@property (nonatomic, assign) NSInteger selectionStartIndex;
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@property (nonatomic, assign) NSInteger selectionEndIndex;
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@property (nonatomic, assign) BOOL isSelecting;
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// ---- Gesture recognizers ----
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@property (nonatomic, strong) UITapGestureRecognizer *singleTapGR;
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@property (nonatomic, strong) UILongPressGestureRecognizer *longPressGR;
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@property (nonatomic, strong) UIPanGestureRecognizer *panGR;
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// ---- Highlight/underline drawing cache ----
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@property (nonatomic, strong) NSMutableArray<NSDictionary *> *highlightRects;
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@end
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// ============================================================================
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#pragma mark - WRPageView Implementation
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// ============================================================================
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@implementation WRPageView
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// ---- Synthesize properties backed by ivars from the binary ----
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// The binary shows these ivar types:
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// NSArray -> imageAttachments
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// NSMutableArray -> visibleHighlights
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// NSTimer -> autoReadTimer
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// NSTimer -> loadingTimeoutTimer
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// NSString -> chapterId
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// UILabel -> headerLabel
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// UIImageView -> backgroundImageView
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// WRActivityIndicator -> activityIndicator
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// UILabel -> statusLabel
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// QMUIButton -> retryButton
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// QMUIButton -> shareButton
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// WRLoadingProgressView -> loadingProgressView
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// QMUIButton -> bookmarkButton
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// QMUIButton -> fontSizeUpButton
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// QMUIButton -> fontSizeDownButton
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// WRFriendReviewsButton -> friendReviewsButton
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// ============================================================================
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#pragma mark - Lifecycle
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// ============================================================================
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- (instancetype)initWithFrame:(CGRect)frame {
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self = [super initWithFrame:frame];
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if (self) {
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// CoreText views must be opaque and have a cleared background for
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// the CGContext to render correctly.
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self.opaque = YES;
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self.backgroundColor = [UIColor whiteColor];
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self.clearsContextBeforeDrawing = YES;
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// Enable multiple touches for selection handles.
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self.multipleTouchEnabled = YES;
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_selectionStartIndex = NSNotFound;
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_selectionEndIndex = NSNotFound;
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_isSelecting = NO;
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[self _setupSubviews];
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[self _setupGestureRecognizers];
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}
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return self;
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}
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- (void)dealloc {
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[_autoReadTimer invalidate];
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[_loadingTimeoutTimer invalidate];
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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// ============================================================================
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#pragma mark - Subview Setup
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// ============================================================================
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/// Creates the non-text overlay UI elements. The reading text itself is
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/// rendered entirely in -drawRect: via CoreText, so these are all floating
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/// controls layered on top.
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- (void)_setupSubviews {
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// ---- Background image (e.g., paper texture) ----
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_backgroundImageView = [[UIImageView alloc] initWithFrame:self.bounds];
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_backgroundImageView.autoresizingMask = UIViewAutoresizingFlexibleWidth |
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UIViewAutoresizingFlexibleHeight;
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_backgroundImageView.contentMode = UIViewContentModeScaleAspectFill;
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[self addSubview:_backgroundImageView];
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// ---- Header label (chapter title, page indicator) ----
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_headerLabel = [[UILabel alloc] initWithFrame:CGRectZero];
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_headerLabel.font = [UIFont systemFontOfSize:12.0];
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_headerLabel.textColor = [UIColor grayColor];
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_headerLabel.textAlignment = NSTextAlignmentCenter;
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[self addSubview:_headerLabel];
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// ---- Activity indicator (shown during chapter load) ----
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_activityIndicator = [[WRActivityIndicator alloc] initWithFrame:CGRectZero];
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_activityIndicator.hidden = YES;
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[self addSubview:_activityIndicator];
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// ---- Status label (error / empty state) ----
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_statusLabel = [[UILabel alloc] initWithFrame:CGRectZero];
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_statusLabel.font = [UIFont systemFontOfSize:15.0];
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_statusLabel.textColor = [UIColor darkGrayColor];
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_statusLabel.textAlignment = NSTextAlignmentCenter;
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_statusLabel.numberOfLines = 0;
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_statusLabel.hidden = YES;
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[self addSubview:_statusLabel];
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// ---- Retry button ----
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_retryButton = [QMUIButton buttonWithType:UIButtonTypeSystem];
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[_retryButton setTitle:@"重试" forState:UIControlStateNormal]; // "Retry"
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[_retryButton addTarget:self
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action:@selector(_retryButtonTapped:)
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forControlEvents:UIControlEventTouchUpInside];
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_retryButton.hidden = YES;
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[self addSubview:_retryButton];
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// ---- Share button ----
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_shareButton = [QMUIButton buttonWithType:UIButtonTypeSystem];
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[_shareButton setImage:[UIImage imageNamed:@"icon_share"]
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forState:UIControlStateNormal];
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[_shareButton addTarget:self
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action:@selector(_shareButtonTapped:)
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forControlEvents:UIControlEventTouchUpInside];
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_shareButton.hidden = YES;
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[self addSubview:_shareButton];
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// ---- Loading progress view ----
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_loadingProgressView = [[WRLoadingProgressView alloc] initWithFrame:CGRectZero];
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_loadingProgressView.hidden = YES;
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[self addSubview:_loadingProgressView];
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// ---- Bookmark button ----
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_bookmarkButton = [QMUIButton buttonWithType:UIButtonTypeSystem];
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[_bookmarkButton addTarget:self
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action:@selector(_bookmarkButtonTapped:)
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forControlEvents:UIControlEventTouchUpInside];
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[self addSubview:_bookmarkButton];
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// ---- Font size buttons ----
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_fontSizeUpButton = [QMUIButton buttonWithType:UIButtonTypeSystem];
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[_fontSizeUpButton setTitle:@"A+" forState:UIControlStateNormal];
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[_fontSizeUpButton addTarget:self
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action:@selector(_fontSizeUpTapped:)
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forControlEvents:UIControlEventTouchUpInside];
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[self addSubview:_fontSizeUpButton];
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_fontSizeDownButton = [QMUIButton buttonWithType:UIButtonTypeSystem];
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[_fontSizeDownButton setTitle:@"A-" forState:UIControlStateNormal];
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[_fontSizeDownButton addTarget:self
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action:@selector(_fontSizeDownTapped:)
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forControlEvents:UIControlEventTouchUpInside];
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[self addSubview:_fontSizeDownButton];
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// ---- Friend reviews button ----
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_friendReviewsButton = [[WRFriendReviewsButton alloc] initWithFrame:CGRectZero];
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[_friendReviewsButton addTarget:self
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action:@selector(_friendReviewsTapped:)
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forControlEvents:UIControlEventTouchUpInside];
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_friendReviewsButton.hidden = YES;
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[self addSubview:_friendReviewsButton];
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}
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// ============================================================================
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#pragma mark - Gesture Recognizers
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// ============================================================================
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- (void)_setupGestureRecognizers {
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// Single tap: link detection, selection dismissal, toolbar toggle.
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_singleTapGR = [[UITapGestureRecognizer alloc]
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initWithTarget:self action:@selector(_handleSingleTap:)];
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_singleTapGR.numberOfTapsRequired = 1;
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[self addGestureRecognizer:_singleTapGR];
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// Long press: initiate text selection.
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_longPressGR = [[UILongPressGestureRecognizer alloc]
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initWithTarget:self action:@selector(_handleLongPress:)];
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_longPressGR.minimumPressDuration = 0.5;
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[self addGestureRecognizer:_longPressGR];
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// Pan: extend selection after long press.
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_panGR = [[UIPanGestureRecognizer alloc]
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initWithTarget:self action:@selector(_handlePan:)];
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_panGR.enabled = NO; // Enabled only when selecting.
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[self addGestureRecognizer:_panGR];
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// Long press should fail before single tap fires.
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[_singleTapGR requireGestureRecognizerToFail:_longPressGR];
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}
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// ============================================================================
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#pragma mark - Layout
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// ============================================================================
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- (void)layoutSubviews {
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[super layoutSubviews];
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// Position the header label at the top edge with padding.
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CGFloat headerHeight = 20.0;
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_headerLabel.frame = CGRectMake(16.0, 8.0,
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CGRectGetWidth(self.bounds) - 32.0,
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headerHeight);
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// Center the activity indicator.
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_activityIndicator.center = CGPointMake(CGRectGetMidX(self.bounds),
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CGRectGetMidY(self.bounds));
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// Position the friend reviews button at bottom-right.
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CGSize reviewSize = CGSizeMake(60.0, 30.0);
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_friendReviewsButton.frame =
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CGRectMake(CGRectGetWidth(self.bounds) - reviewSize.width - 16.0,
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CGRectGetHeight(self.bounds) - reviewSize.height - 40.0,
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reviewSize.width, reviewSize.height);
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}
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// ============================================================================
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#pragma mark - CoreText Drawing (drawRect:)
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// ============================================================================
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///
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/// This is the heart of the page view. It draws the chapter text directly
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/// into the CGContext using CoreText. No UILabel or UITextView is involved.
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///
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/// The flow is:
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/// 1. Get the current graphics context.
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/// 2. Flip the coordinate system for CoreText (origin at bottom-left).
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/// 3. Call WRCoreTextLayoutFrame to draw the attributed string runs.
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/// 4. Draw inline images at their attachment positions.
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/// 5. Draw highlight/underline overlays.
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///
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- (void)drawRect:(CGRect)rect {
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CGContextRef ctx = UIGraphicsGetCurrentContext();
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if (!ctx) return;
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// If there is no chapter data or layout frame, just clear and return.
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if (!self.chapterData || !self.layoutFrame) {
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CGContextClearRect(ctx, rect);
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return;
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}
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// ---- Step 1: Fill background ----
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UIColor *bgColor = self.backgroundColor ?: [UIColor whiteColor];
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CGContextSetFillColorWithColor(ctx, bgColor.CGColor);
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CGContextFillRect(ctx, rect);
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// ---- Step 2: Flip coordinate system for CoreText ----
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// CoreText uses a bottom-left origin; UIKit uses top-left.
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CGContextSetTextMatrix(ctx, CGAffineTransformIdentity);
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CGContextTranslateCTM(ctx, 0.0, CGRectGetHeight(self.bounds));
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CGContextScaleCTM(ctx, 1.0, -1.0);
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// ---- Step 3: Draw the layout frame ----
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// This calls WRCoreTextLayoutFrame -drawInContext:image:size:inRect:position:
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// which iterates over CTLine objects, draws glyphs, and positions images.
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CGSize pageSize = self.bounds.size;
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CGPoint drawOrigin = CGPointMake(0.0, 0.0); // Could include margins.
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CGRect drawRect = UIEdgeInsetsInsetRect(self.bounds,
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self.chapterData.contentInsets);
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[self.layoutFrame drawInContext:ctx
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image:self.backgroundImageView.image
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size:pageSize
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inRect:drawRect
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position:drawOrigin];
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// ---- Step 4: Draw highlights and underlines ----
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[self _drawHighlightsInContext:ctx];
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// ---- Step 5: Draw selection handles if selecting ----
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if (self.isSelecting) {
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[self _drawSelectionInContext:ctx];
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}
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}
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/// Draws highlight rectangles and underline paths for annotations,
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/// bookmarks, and the current selection.
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- (void)_drawHighlightsInContext:(CGContextRef)ctx {
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for (NSDictionary *entry in self.highlightRects) {
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CGRect hlRect = [entry[@"rect"] CGRectValue];
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UIColor *color = entry[@"color"] ?: [UIColor yellowColor];
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BOOL isUnderline = [entry[@"underline"] boolValue];
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CGContextSetFillColorWithColor(ctx,
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[color colorWithAlphaComponent:0.3].CGColor);
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CGContextFillRect(ctx, hlRect);
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if (isUnderline) {
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CGFloat y = CGRectGetMaxY(hlRect);
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CGContextSetStrokeColorWithColor(ctx, color.CGColor);
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CGContextSetLineWidth(ctx, 1.0);
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CGContextMoveToPoint(ctx, CGRectGetMinX(hlRect), y);
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CGContextAddLineToPoint(ctx, CGRectGetMaxX(hlRect), y);
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CGContextStrokePath(ctx);
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}
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}
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}
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/// Draws the selection highlight between selectionStartIndex and
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/// selectionEndIndex using CTLineGetOffsetForStringIndex.
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- (void)_drawSelectionInContext:(CGContextRef)ctx {
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if (_selectionStartIndex == NSNotFound || _selectionEndIndex == NSNotFound) {
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return;
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}
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// Clamp range.
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NSInteger lo = MIN(_selectionStartIndex, _selectionEndIndex);
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NSInteger hi = MAX(_selectionStartIndex, _selectionEndIndex);
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NSRange selRange = NSMakeRange((NSUInteger)lo, (NSUInteger)(hi - lo));
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// Ask the layout frame for the rects covering this range.
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NSArray<NSValue *> *rects = [self.layoutFrame rectsWithinRange:selRange];
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UIColor *selColor = [UIColor colorWithRed:0.2 green:0.5 blue:1.0 alpha:0.3];
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for (NSValue *val in rects) {
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CGRect r = [val CGRectValue];
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CGContextSetFillColorWithColor(ctx, selColor.CGColor);
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CGContextFillRect(ctx, r);
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}
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}
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// ============================================================================
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#pragma mark - Drawing API (called externally)
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// ============================================================================
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/// External entry point for drawing. Delegates to the layout frame.
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- (void)drawInContext:(CGContextRef)context
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withData:(WRChapterData *)chapterData
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size:(CGSize)size
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inRect:(CGRect)rect
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position:(CGPoint)position {
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// Store references so -drawRect: can use them.
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self.chapterData = chapterData;
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// Trigger a redraw.
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[self setNeedsDisplay];
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}
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// ============================================================================
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#pragma mark - Text Selection via CoreText Hit Testing
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// ============================================================================
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/// Converts a view-coordinate point to a string index in the attributed string
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/// using CTLineGetStringIndexForPosition.
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- (NSInteger)stringIndexForPoint:(CGPoint)point {
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if (!self.layoutFrame) return NSNotFound;
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// Flip Y for CoreText.
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CGPoint ctPoint = WRSFlipPointForCoreText(point, CGRectGetHeight(self.bounds));
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// Walk the CTLine objects in the layout frame to find the line at this Y,
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// then use CTLineGetStringIndexForPosition to get the character index.
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NSInteger index = [self.layoutFrame stringIndexForPoint:ctPoint];
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return index;
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}
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/// Returns the range of the line containing the given string index,
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/// using CTLineGetOffsetForStringIndex to find line boundaries.
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- (NSRange)lineRangeForStringIndex:(NSInteger)index {
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if (!self.layoutFrame || index == NSNotFound) {
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return NSMakeRange(NSNotFound, 0);
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}
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return [self.layoutFrame lineRangeForStringIndex:index];
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}
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/// Clears the current text selection and disables the pan gesture.
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- (void)clearSelection {
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_selectionStartIndex = NSNotFound;
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_selectionEndIndex = NSNotFound;
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_isSelecting = NO;
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_panGR.enabled = NO;
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[self setNeedsDisplay];
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}
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// ============================================================================
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#pragma mark - Gesture Handlers
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// ============================================================================
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- (void)_handleSingleTap:(UITapGestureRecognizer *)gr {
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CGPoint pt = [gr locationInView:self];
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// If currently selecting, dismiss selection.
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if (self.isSelecting) {
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[self clearSelection];
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return;
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}
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// Check if the tap hits a link in the layout frame.
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NSInteger idx = [self stringIndexForPoint:pt];
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if (idx != NSNotFound) {
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NSURL *linkURL = [self.layoutFrame linkURLAtIndex:idx];
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if (linkURL) {
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if ([self.delegate respondsToSelector:@selector(pageView:didTapLinkWithURL:)]) {
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[self.delegate pageView:self didTapLinkWithURL:linkURL];
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}
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return;
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}
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}
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// Otherwise, toggle toolbar / delegate the tap.
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// (In the real app, this toggles the reader chrome.)
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}
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- (void)_handleLongPress:(UILongPressGestureRecognizer *)gr {
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if (gr.state == UIGestureRecognizerStateBegan) {
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CGPoint pt = [gr locationInView:self];
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NSInteger idx = [self stringIndexForPoint:pt];
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if (idx != NSNotFound) {
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_selectionStartIndex = idx;
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_selectionEndIndex = idx;
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_isSelecting = YES;
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_panGR.enabled = YES;
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[self setNeedsDisplay];
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if ([self.delegate respondsToSelector:@selector(pageView:didBeginSelectionAtPoint:)]) {
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[self.delegate pageView:self didBeginSelectionAtPoint:pt];
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}
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}
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}
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}
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- (void)_handlePan:(UIPanGestureRecognizer *)gr {
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if (!self.isSelecting) return;
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CGPoint pt = [gr locationInView:self];
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NSInteger idx = [self stringIndexForPoint:pt];
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if (idx != NSNotFound && idx != _selectionEndIndex) {
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_selectionEndIndex = idx;
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[self setNeedsDisplay];
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// Notify delegate of selection range change.
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NSInteger lo = MIN(_selectionStartIndex, _selectionEndIndex);
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NSInteger hi = MAX(_selectionStartIndex, _selectionEndIndex);
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NSRange selRange = NSMakeRange((NSUInteger)lo, (NSUInteger)(hi - lo));
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if ([self.delegate respondsToSelector:@selector(pageView:selectionDidChangeWithRange:)]) {
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[self.delegate pageView:self selectionDidChangeWithRange:selRange];
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}
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}
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}
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// ============================================================================
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#pragma mark - Accessibility
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// ============================================================================
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/// Provides a plain-text representation of the page for VoiceOver.
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- (nullable NSString *)accessibilityValue {
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if (!self.chapterData) return nil;
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NSAttributedString *attrStr = self.chapterData.typesetAttributedString;
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if (!attrStr) return nil;
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// Return the plain text for the current page range.
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NSRange pageRange = [self.chapterData rangeOfPage:self.pageIndex];
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return WRPlainStringFromRange(attrStr, pageRange);
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}
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/// Supports VoiceOver scroll gestures to flip pages.
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- (BOOL)accessibilityScroll:(UIAccessibilityScrollDirection)direction {
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||
// Post a page-change notification for the WRPageViewController to handle.
|
||
NSString *dirStr = nil;
|
||
switch (direction) {
|
||
case UIAccessibilityScrollDirectionLeft:
|
||
dirStr = @"next";
|
||
break;
|
||
case UIAccessibilityScrollDirectionRight:
|
||
dirStr = @"previous";
|
||
break;
|
||
default:
|
||
return NO;
|
||
}
|
||
|
||
[[NSNotificationCenter defaultCenter]
|
||
postNotificationName:@"WRPageViewAccessibilityScroll"
|
||
object:self
|
||
userInfo:@{@"direction": dirStr}];
|
||
return YES;
|
||
}
|
||
|
||
// ============================================================================
|
||
#pragma mark - Friend Reviews
|
||
// ============================================================================
|
||
|
||
- (void)friendReviewsCount:(NSUInteger)count {
|
||
self.friendReviewsButton.hidden = (count == 0);
|
||
[self.friendReviewsButton setReviewCount:count];
|
||
}
|
||
|
||
// ============================================================================
|
||
#pragma mark - Loading / Error States
|
||
// ============================================================================
|
||
|
||
- (void)showLoadingWithProgress:(float)progress {
|
||
self.activityIndicator.hidden = NO;
|
||
[self.activityIndicator startAnimating];
|
||
|
||
if (progress > 0.0 && progress < 1.0) {
|
||
self.loadingProgressView.hidden = NO;
|
||
self.loadingProgressView.progress = progress;
|
||
} else {
|
||
self.loadingProgressView.hidden = YES;
|
||
}
|
||
|
||
// Start a timeout timer — if loading takes too long, show an error.
|
||
[_loadingTimeoutTimer invalidate];
|
||
_loadingTimeoutTimer =
|
||
[NSTimer scheduledTimerWithTimeInterval:15.0
|
||
target:self
|
||
selector:@selector(_loadingDidTimeout)
|
||
userInfo:nil
|
||
repeats:NO];
|
||
}
|
||
|
||
- (void)hideLoading {
|
||
[_loadingTimeoutTimer invalidate];
|
||
_loadingTimeoutTimer = nil;
|
||
|
||
[self.activityIndicator stopAnimating];
|
||
self.activityIndicator.hidden = YES;
|
||
self.loadingProgressView.hidden = YES;
|
||
}
|
||
|
||
- (void)showErrorWithMessage:(NSString *)message {
|
||
[self hideLoading];
|
||
self.statusLabel.text = message;
|
||
self.statusLabel.hidden = NO;
|
||
self.retryButton.hidden = NO;
|
||
}
|
||
|
||
- (void)_loadingDidTimeout {
|
||
[self showErrorWithMessage:@"加载超时，请重试"]; // "Loading timed out, please retry"
|
||
}
|
||
|
||
// ============================================================================
|
||
#pragma mark - Button Actions
|
||
// ============================================================================
|
||
|
||
- (void)_retryButtonTapped:(QMUIButton *)sender {
|
||
self.statusLabel.hidden = YES;
|
||
self.retryButton.hidden = YES;
|
||
if ([self.delegate respondsToSelector:@selector(pageViewNeedsReload:)]) {
|
||
[self.delegate pageViewNeedsReload:self];
|
||
}
|
||
}
|
||
|
||
- (void)_shareButtonTapped:(QMUIButton *)sender {
|
||
// Share current page content.
|
||
// Handled by delegate or responder chain.
|
||
}
|
||
|
||
- (void)_bookmarkButtonTapped:(QMUIButton *)sender {
|
||
// Toggle bookmark for current page.
|
||
sender.selected = !sender.selected;
|
||
}
|
||
|
||
- (void)_fontSizeUpTapped:(QMUIButton *)sender {
|
||
// Increase font size — triggers re-typeset.
|
||
[[NSNotificationCenter defaultCenter]
|
||
postNotificationName:@"WRPageViewFontSizeChange"
|
||
object:self
|
||
userInfo:@{@"delta": @(1)}];
|
||
}
|
||
|
||
- (void)_fontSizeDownTapped:(QMUIButton *)sender {
|
||
[[NSNotificationCenter defaultCenter]
|
||
postNotificationName:@"WRPageViewFontSizeChange"
|
||
object:self
|
||
userInfo:@{@"delta": @(-1)}];
|
||
}
|
||
|
||
- (void)_friendReviewsTapped:(QMUIButton *)sender {
|
||
if ([self.delegate respondsToSelector:@selector(pageView:didTapFriendReviewsWithCount:)]) {
|
||
[self.delegate pageView:self
|
||
didTapFriendReviewsWithCount:sender.tag];
|
||
}
|
||
}
|
||
|
||
// ============================================================================
|
||
#pragma mark - Auto-Read Timer
|
||
// ============================================================================
|
||
|
||
/// Starts the auto-read timer that periodically advances the page.
|
||
- (void)startAutoReadWithInterval:(NSTimeInterval)interval {
|
||
[_autoReadTimer invalidate];
|
||
_autoReadTimer =
|
||
[NSTimer scheduledTimerWithTimeInterval:interval
|
||
target:self
|
||
selector:@selector(_autoReadTick)
|
||
userInfo:nil
|
||
repeats:YES];
|
||
}
|
||
|
||
- (void)stopAutoRead {
|
||
[_autoReadTimer invalidate];
|
||
_autoReadTimer = nil;
|
||
}
|
||
|
||
- (void)_autoReadTick {
|
||
// Post notification for the page view controller to advance.
|
||
[[NSNotificationCenter defaultCenter]
|
||
postNotificationName:@"WRPageViewAutoReadAdvance"
|
||
object:self];
|
||
}
|
||
|
||
@end
|