42 lines
1.1 KiB
Swift
42 lines
1.1 KiB
Swift
import UIKit
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#if canImport(DTCoreText)
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import DTCoreText
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/// 基于 DTCoreText 的 Core Text 直接绘制视图
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/// 将 DTCoreText 的排版结果直接绘制到 UIView 上，跳过 UITextView 的间接渲染。
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final class RDEPUBTextPageRenderView: UIView {
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var layoutFrame: DTCoreTextLayoutFrame? {
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didSet {
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setNeedsDisplay()
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}
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}
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var drawOptions: DTCoreTextLayoutFrameDrawingOptions = DTCoreTextLayoutFrameDrawingOptions(rawValue: 1)! {
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didSet {
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setNeedsDisplay()
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}
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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backgroundColor = .clear
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isOpaque = false
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contentMode = .redraw
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}
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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override func draw(_ rect: CGRect) {
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guard let context = UIGraphicsGetCurrentContext(),
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let layoutFrame else { return }
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context.saveGState()
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layoutFrame.draw(in: context, options: drawOptions)
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context.restoreGState()
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}
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}
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#endif
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