Iphone 键盘隐藏时的iOS事件

我需要控制，在键盘显示并按下“完成”按钮后，当键盘隐藏时。在iOS上隐藏键盘时触发哪个事件？谢谢

您可以收听

UIKeyboardWillHideNotification

，它会在键盘关闭时发送。

是使用以下命令

//UIKeyboardDidHideNotification when keyboard is fully hidden
//name:UIKeyboardWillHideNotification when keyboard is going to be hidden

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(onKeyboardHide:) name:UIKeyboardWillHideNotification object:nil];

和

onKeyboardHide

-(void)onKeyboardHide:(NSNotification *)notification
{
     //keyboard will hide
}

---

如果您想知道用户何时按下“完成”按钮，则必须采用

UITextFieldDelegate

协议，然后在您的视图控制器中实现此方法：

Swift 3：

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    // this will hide the keyboard
    textField.resignFirstResponder()
    return true
}

NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow(_:)), name: .UIKeyboardWillShow , object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide(_:)), name: .UIKeyboardWillHide , object: nil)

func keyboardWillShow(_ notification: NSNotification) {
    print("keyboard will show!")

    // To obtain the size of the keyboard:
    let keyboardSize:CGSize = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue.size

}

func keyboardWillHide(_ notification: NSNotification) {
    print("Keyboard will hide!")
}

如果您只想知道键盘何时显示或隐藏，请使用

通知

：

Swift 3：

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    // this will hide the keyboard
    textField.resignFirstResponder()
    return true
}

NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow(_:)), name: .UIKeyboardWillShow , object: nil)

NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide(_:)), name: .UIKeyboardWillHide , object: nil)

func keyboardWillShow(_ notification: NSNotification) {
    print("keyboard will show!")

    // To obtain the size of the keyboard:
    let keyboardSize:CGSize = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue.size

}

func keyboardWillHide(_ notification: NSNotification) {
    print("Keyboard will hide!")
}

---

准确地说，通知是在键盘被解除之前发送的。可能重复的通知将在解除时触发，而不是在键盘完全隐藏时触发。是的，正确，请检查更新的答案，以获取完全隐藏的通知使用

uikeyboarddidenotification