feat(epub): complete wxread parity scope

Sources/RDReaderView/EPUBUI/RDEPUBReaderSettings.swift

@@ -112,6 +112,8 @@ public struct RDEPUBReaderSettings: Codable, Equatable {
     public var fontSize: CGFloat?
     /// 用户选择的行距倍数，nil 表示使用默认值
     public var lineHeightMultiple: CGFloat?
+    /// 用户选择的栏数，nil 表示使用默认值
+    public var numberOfColumns: Int?
     /// 用户选择的翻页模式，nil 表示使用默认值
     public var displayMode: RDEPUBReaderDisplayMode?
     /// 用户选择的主题预设，nil 表示使用默认值
@@ -122,12 +124,14 @@ public struct RDEPUBReaderSettings: Codable, Equatable {
         brightness: CGFloat? = nil,
         fontSize: CGFloat? = nil,
         lineHeightMultiple: CGFloat? = nil,
+        numberOfColumns: Int? = nil,
         displayMode: RDEPUBReaderDisplayMode? = nil,
         themePreset: RDEPUBReaderThemePreset? = nil
     ) {
         self.brightness = brightness
         self.fontSize = fontSize
         self.lineHeightMultiple = lineHeightMultiple
+        self.numberOfColumns = numberOfColumns
         self.displayMode = displayMode
         self.themePreset = themePreset
     }
@@ -145,6 +149,9 @@ public struct RDEPUBReaderSettings: Codable, Equatable {
         if let lineHeightMultiple {
             resolvedConfiguration.lineHeightMultiple = lineHeightMultiple
         }
+        if let numberOfColumns {
+            resolvedConfiguration.numberOfColumns = max(1, numberOfColumns)
+        }
         if let displayMode {
             resolvedConfiguration.displayType = displayMode.displayType
         }
@@ -169,8 +176,9 @@ public struct RDEPUBReaderSettings: Codable, Equatable {
             brightness: max(0, min(1, brightness)),
             fontSize: configuration.fontSize,
             lineHeightMultiple: configuration.lineHeightMultiple,
+            numberOfColumns: configuration.numberOfColumns,
             displayMode: RDEPUBReaderDisplayMode(displayType: configuration.displayType),
             themePreset: RDEPUBReaderThemePreset(theme: configuration.theme)
         )
     }
-}
+}