swift3 UITextView键盘显示隐藏处理

    1. 键盘启动的时候, viewDidLoad()函数里加
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
    func keyboardWillShow(aNotification: NSNotification) {
        print("text view begin")
        // 获取键盘高度
        let userinfo: NSDictionary = aNotification.userInfo! as NSDictionary
        let nsValue = userinfo.object(forKey: UIKeyboardFrameEndUserInfoKey)
        let keyboardRec = (nsValue as AnyObject).cgRectValue
        let height = keyboardRec?.size.height
        self.keyHeight = Int(height!)
        UIView.animate(withDuration: 0.5, animations: {
            var frame = self.view.frame
            frame.origin.y = -(CGFloat)(self.keyHeight)
            self.view.frame = frame
        }, completion: nil)
    }
  • 2.恢复键盘
    //键盘隐藏时恢复
    func textFieldShouldEndEditing(_ textField: UITextField) -> Bool {
        UIView.animate(withDuration: 0.5, animations: {
            var frame = self.view.frame
            frame.origin.y = 0
            self.view.frame = frame
        }, completion: nil)
        return true
    }

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