該博客同步于 <swift 帶復(fù)制功能的 Label | AndyCuiの博客>

產(chǎn)品需求需要對(duì) UILabel 展示的文本進(jìn)行復(fù)制操作,針對(duì)這一需求想出了兩種實(shí)現(xiàn)方式: 1.自定義控件,添加復(fù)制功能. 2.使用 UItextView 實(shí)現(xiàn).

通過(guò)自定義 UILabel 的子類(lèi)實(shí)現(xiàn)

• 創(chuàng)建 YTTCopyLabel, 使其繼承于 UILabel.

class YTTCopyLabel: UILabel {
}

• 使 YTTCopyLabel 可以進(jìn)行交互, 添加長(zhǎng)按手勢(shì)使其觸發(fā)復(fù)制事件

override var canBecomeFirstResponder: Bool { return true }

override func awakeFromNib() {
    super.awakeFromNib()
    setup()
}

override init(frame: CGRect) {
    super.init(frame: frame)
    setup()
}

private func setup() {
    self.isUserInteractionEnabled = true
    let longPressGestureRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(longPressAction(_:)))
    self.addGestureRecognizer(longPressGestureRecognizer)
}

• 在長(zhǎng)按事件中實(shí)現(xiàn)復(fù)制功能
  使用 UIMenuController 彈出復(fù)制菜單.使用簡(jiǎn)介

@objc private func longPressAction(_ sender: UIGestureRecognizer) {

    guard sender.state == .began else {
    return
    }

    // 變?yōu)榈谝豁憫?yīng)者
    self.becomeFirstResponder()

    // 菜單控制器
    let menuController = UIMenuController.shared
    // 復(fù)制 item
    let copyItem = UIMenuItem(title: "復(fù)制", action: #selector(copyText))
    // 添加 item 到 menu 控制器
    menuController.menuItems = [copyItem]
    // 設(shè)置菜單控制器點(diǎn)擊區(qū)域?yàn)楫?dāng)前控件 bounds
    menuController.setTargetRect(self.bounds, in: self)
    // 菜單顯示器可見(jiàn)
    menuController.setMenuVisible(true, animated: true)

}

• 確認(rèn) label 具有的操作能力

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
    if action == #selector(copyText) {
        return true
    }
    return false
}

• 實(shí)現(xiàn)將 label 內(nèi)容放到剪切板

@objc private func copyText() {
    UIPasteboard.general.string = self.text
}

• 在需要的地方使用

let label = YTTCopyLabel(frame: CGRect(x: 20, y: 100, width: self.view.frame.width - 40, height: 30))

運(yùn)行效果如下:
YTTCopyLabel.swift

通過(guò)設(shè)置 UITextView 的屬性實(shí)現(xiàn)

UITextView 本身就有復(fù)制的功能,他有兩個(gè)屬性车海，一個(gè)可控制其是否編輯，一個(gè)是可控制其是否可選,只需將其可編輯設(shè)為 false

isEditable = false

• 創(chuàng)建 YTTCustomTextView,使其繼承與 UITextView

class YTTCustomTextView: UITextView {
}

• 重寫(xiě)父類(lèi)方法,使其使其編輯功能

@IBInspectable
var isAutoLayout: Bool = true  // 是否是自適應(yīng)布局

override func awakeFromNib() {
    super.awakeFromNib()
    setup()
}

override init(frame: CGRect, textContainer: NSTextContainer?) {
    super.init(frame: frame, textContainer: textContainer)
    setup()
}

private func setup() {
    self.isEditable = false
    self.isScrollEnabled = false // 設(shè)為 false 可自適應(yīng)
}

• 重寫(xiě)屬性 text 與 attributedText, 進(jìn)行自適應(yīng)布局

override var text: String! {
    get {
        return super.text
    }
    set {
        super.text = newValue
        if !isAutoLayout {
            let width = self.bounds.width - (self.contentInset.left + self.contentInset.right + self.textContainerInset.left + self.textContainerInset.right + self.textContainer.lineFragmentPadding * 2)
            let paragraphStyle = NSMutableParagraphStyle()
            paragraphStyle.lineBreakMode = self.textContainer.lineBreakMode
            let wordHeight = (self.text as NSString).boundingRect(with: CGSize(width: width, height: CGFloat.greatestFiniteMagnitude), options: [.usesLineFragmentOrigin, .usesFontLeading], attributes: [.font : self.font!, .paragraphStyle: paragraphStyle ], context: nil).height + self.textContainerInset.top + self.textContainerInset.bottom + self.textContainer.lineFragmentPadding * 2 + self.contentInset.top + self.contentInset.bottom
            let rect = CGRect(x: self.frame.minX, y: self.frame.minY, width: width, height: wordHeight)
            self.frame = rect
        }
    }
}

override var attributedText: NSAttributedString! {
    get {
        return super.attributedText
    }
    set {
        super.attributedText = newValue
        if !isAutoLayout {
            let width = self.bounds.width - (self.contentInset.left + self.contentInset.right + self.textContainerInset.left + self.textContainerInset.right + self.textContainer.lineFragmentPadding * 2)
            let wordHeight = newValue.boundingRect(with: CGSize(width: width, height: CGFloat.greatestFiniteMagnitude), options: [.usesLineFragmentOrigin, .usesFontLeading], context: nil).height + self.textContainerInset.top + self.textContainerInset.bottom + self.textContainer.lineFragmentPadding * 2 + self.contentInset.top + self.contentInset.bottom
            let rect = CGRect(x: self.frame.minX, y: self.frame.minY, width: width, height: wordHeight)
            self.frame = rect
        }
    }
}

• 判斷屏幕點(diǎn)擊事件是否在本視圖,不是取消選中狀態(tài)

// 設(shè)置點(diǎn)擊空白取消選中效果
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
    // 判斷點(diǎn)擊點(diǎn)是否在本視圖
    if !self.point(inside: point, with: event) {
        self.selectedRange = NSMakeRange(0, 0) // 設(shè)置為 NSMakeRange(0, 0) 取消選中效果
    }
    return super.hitTest(point, with: event)
}

YTTCustomTextView