Pasteboard

這次來做一下剪貼簿的功能，code很簡單，功用主要是將app裡面的文字或圖片長按複製，之後再貼到其他地方。例如備忘錄

限制：iOS 3以上 (基本無限制)

單行文字

實作(1)單行文字

UIPasteboard.general.string = "輸入想要複製的文字"

圖片

實作(2)圖片

UIPasteboard.general.image = "輸入你想要複製的 UIimage"

多行文字

實作(3)多行文字

UIPasteboard.general.strings = "輸入想複製的string array"

Label 可支援 copy 文字功能

實作(4) Label 可支援 copy 文字功能

客製化Label

class CopyLabel: UILabel {
  override init(frame: CGRect) {
    super.init(frame: frame)
    sharedInit()
  }
  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    sharedInit()
  }
  func sharedInit() {
    isUserInteractionEnabled = true
    addGestureRecognizer(UILongPressGestureRecognizer(target: self,
    action: #selector(showMenu(_:))))
  }
  @objc func showMenu(_ sender: UILongPressGestureRecognizer) {
    becomeFirstResponder()
    let menu = UIMenuController.shared
    if !menu.isMenuVisible {
      menu.showMenu(from: self, rect: bounds)
    }
  }
  override func copy(_ sender: Any?) {
    UIPasteboard.general.string = text
    UIMenuController.shared.hideMenu()
  }
  override var canBecomeFirstResponder: Bool {
    return true
  }
  override func canPerformAction(_ action: Selector, withSender   sender: Any?) -> Bool {
    if action == #selector(UIResponderStandardEditActions.copy(_:)) {
        return true
      }
      return false
  }
}

ImageView 可支援 copy 圖片功能

實作(5) ImageView 可支援 copy 圖片功能

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一樣客製化 ImageView

class CopyImageView: UIImageView {
  override init(frame: CGRect) {
    super.init(frame: frame)
    sharedInit()
  }
  required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    sharedInit()
  }
  func sharedInit() {
    isUserInteractionEnabled = true
    addGestureRecognizer(UILongPressGestureRecognizer(target: self,
    action: #selector(showMenu(_:))))
  }
  @objc func showMenu(_ sender: UILongPressGestureRecognizer) {
    becomeFirstResponder()
    let menu = UIMenuController.shared
    if !menu.isMenuVisible {
      menu.showMenu(from: self, rect: bounds)
    }
  }
  override func copy(_ sender: Any?) {
    let tmpImage = self.image?.imageWithNewSize(size: CGSize(width: 1920, height: 1080))
    guard let data = tmpImage?.compressImageMid(maxLength: 1920 * 1080), let newImage = UIImage(data: data) else { return }
    UIPasteboard.general.image = newImage
    UIMenuController.shared.hideMenu()
  }
  override func paste(_ sender: Any?)  {
    self.image = UIPasteboard.general.image
    UIMenuController.shared.hideMenu()
  }
  override var canBecomeFirstResponder: Bool {
    return true
  }
  override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
  if action == #selector(UIResponderStandardEditActions.copy(_:)) &&  self.image != nil {
    return true
  } else if action ==  #selector(UIResponderStandardEditActions.paste(_:)) && self.image == nil {
    return true
  }
    return false
  }
}

Tabele Cell 可支援 copy 文字功能

實作(6) Tabele Cell 可支援 copy 文字功能

將有 TableView 的 ViewController 裡多呼叫三個 UITableViewDelegate 的 func

1. func tableView(_ tableView: UITableView, performAction action: Selector, forRowAt indexPath: IndexPath, withSender sender: Any?) {}
2. func tableView(_ tableView: UITableView, canPerformAction action: Selector, forRowAt indexPath: IndexPath, withSender sender: Any?) -> Bool {}
3. func tableView(_ tableView: UITableView, shouldShowMenuForRowAt indexPath: IndexPath) -> Bool {}

在 performAction func 裡回傳 cell的資料給 UIPasteboard.general.string

func tableView(_ tableView: UITableView, performAction action: Selector, forRowAt indexPath: IndexPath, withSender sender: Any?) {
   UIPasteboard.general.string = strArr[indexPath.row]
}

在 canPerformAction func 裡判斷支援哪種手勢事件，此範例只支援copy功能

func tableView(_ tableView: UITableView, canPerformAction action: Selector, forRowAt indexPath: IndexPath, withSender sender: Any?) -> Bool {
  if action == #selector(UIResponderStandardEditActions.copy(_:)) {
    return true
  }
  return false
}

在 shouldShowMenuForRowAt func 裡判斷是否允許顯示 UIMenuController ，此範例不限制哪個 cell，如果想限制哪幾個不行複製可在這設定。

func tableView(_ tableView: UITableView, shouldShowMenuForRowAt indexPath: IndexPath) -> Bool {
  return true
}

GitHub

GitHub - molder1007/PasteboardDemo

參考

Apple Developer Documentation

Swift - UIPasteboard剪贴板的使用详解（复制、粘贴文字和图片）