在 swift 中启用时在键盘上方显示按钮时出现问题

Question

我试图在启用时在键盘上方显示一个按钮，但它不能正常工作，当键盘打开时按钮不会移动到键盘上方，当我隐藏键盘时它会移动到屏幕顶部，当它显示给用户时，我如何在键盘上方显示按钮。这是我显示按钮的代码，

NotificationCenter.default.addObserver(self, selector: #selector(SignUpVC.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
             NotificationCenter.default.addObserver(self, selector: #selector(SignUpVC.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        if self.nextBtn.frame.origin.y == 0 {
            self.nextBtn.frame.origin.y -= keyboardSize.height   //can adjust as keyboardSize.height-(any number 30 or 40)
        }
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    if self.nextBtn.frame.origin.y != 0 {
        self.nextBtn.frame.origin.y = 0
    }
}

Answer 1

事实上，您应该更改视图的框架而不是更改按钮的框架。将按钮放在视图下方，当键盘弹出时向上推动视图。

Answer 2

Button frame has an initial y value that isn't 0 , so you need to perserve it and set back

选项 1 : 保存按钮框架并恢复它

var btnFrame:CGRect!
@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        btnFrame =  self.nextBtn.frame 
        self.nextBtn.frame.origin.y -= keyboardSize.height   //can adjust as keyboardSize.height-(any number 30 or 40) 
    }
} 
@objc func keyboardWillHide(notification: NSNotification) { 
    self.nextBtn.frame  = btnFrame
}

选项 2：移动视图本身

@objc func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y == 0 {
            self.view.frame.origin.y -= keyboardSize.height   //can adjust as keyboardSize.height-(any number 30 or 40)
        }
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    if self.view.frame.origin.y != 0 {
        self.view.frame.origin.y = 0
    }
}

Replace UIKeyboardFrameBeginUserInfoKey with UIKeyboardFrameEndUserInfoKey

在 swift 中启用时在键盘上方显示按钮时出现问题

Issue while showing button on above keyboard when enable in swift

keyboard

ios

swift