swift textview禁止用户使用复制粘贴

//自定义一个TextView

class Own_TextView: UITextView {

override func caretRect(for position: UITextPosition) -> CGRect {

return CGRect.zero

}

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {

if action == #selector(copy(_:)) || action == #selector(selectAll(_:)) {

return false

}

if action == #selector(paste(_:)){

return false

}

return super.canPerformAction(action, withSender: sender)

}

}

//禁止复制粘贴

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {

return false

}

let textView = Own_TextView.init(frame: CGRect(x:5, y: NavigationBarHeight + 20, width: ScreenWidth - 10, height: screenHeight - NavigationBarHeight-398-20))