ios - 通知、键盘隐藏

Question

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(true)
    keyboardUpNotification()
    keyboardDownNotification()
}

func keyboardUpNotification() {
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    print("keyboard up notification registered")
}
func keyboardWillShow(_ notification: Notification) {
    view.frame.origin.y = 0 - keyboardSize(notification)
    print("keyboard will show method. \(keyboardSize(notification))")
}


func keyboardDownNotification() {
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    print("keyboard down notification registered")
}
func keyboardWillHide() {
    print("keyboard will hide method")
    view.frame.origin.y = 0
}

我添加了两个通知(键盘向上、向下)。我希望当我触摸返回按钮时键盘隐藏。但 KeyboardWillHide() 方法没有调用。我做错了什么或错过了什么？

Answer 1

第一件事

1.让你的ViewController确认textField委托(delegate)

class YourViewController: UIViewController, UITextFieldDelegate {

}

2.将 self 设置为 textField 委托(delegate)

override func viewDidLoad() {
    super.viewDidLoad()
    self.yourTextField.delegate = self
}

3.实现

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    self.yourTextField.resignFirstResponder()
    return true
}