我刚刚升级到Xcode 8,现在在我的项目中出现错误:
“Type 'NSObject' has no member 'copy'.”
在升级Xcode之前,我没有遇到这个错误。
注意:我仍在使用Swift 2.3。我子类化了UILabel,以便允许用户在长按标签时复制文本。以下是我的代码。错误发生在此行上:
“Type 'NSObject' has no member 'copy'.”
在升级Xcode之前,我没有遇到这个错误。
注意:我仍在使用Swift 2.3。我子类化了UILabel,以便允许用户在长按标签时复制文本。以下是我的代码。错误发生在此行上:
if action == #selector(NSObject.copy(_:))
以下是完整代码:
class MCCopyableLabel: UILabel {
override init(frame: CGRect) {
super.init(frame: frame)
sharedInit()
}
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)!
sharedInit()
}
func sharedInit() {
userInteractionEnabled = true
addGestureRecognizer(UILongPressGestureRecognizer(target: self, action: #selector(MCCopyableLabel.showMenu(_:))))
}
func showMenu(sender: AnyObject?) {
becomeFirstResponder()
let menu = UIMenuController.sharedMenuController()
if !menu.menuVisible {
menu.setTargetRect(bounds, inView: self)
menu.setMenuVisible(true, animated: true)
}
}
override func copy(sender: AnyObject?) {
let board = UIPasteboard.generalPasteboard()
board.string = text
let menu = UIMenuController.sharedMenuController()
menu.setMenuVisible(false, animated: true)
}
override func canBecomeFirstResponder() -> Bool {
return true
}
override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool {
if action == #selector(NSObject.copy(_:)) {
return true
}
return false
}
}
UIResponder.copy(_:)
,或者只是copy(_:)
。 - dan