关于ios：当屏幕显示时，如何让键盘向上推？


How do I make a keyboard push the view up when it comes on screen? Xcode Swift

本问题已经有最佳答案，请猛点这里访问。

所以我有一个视图，其中有一个文本字段，但文本字段在底部。当我单击键盘时，它会弹出并覆盖文本字段，这是我的问题。我想知道当一个键盘出现时，是否有可能将视图的其余部分向上推？

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您可以注册视图控制器，以便在键盘即将显示时得到通知，然后向上推视图。

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class ViewController: UIViewController {

var keyboardAdjusted = false
var lastKeyboardOffset: CGFloat = 0.0

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    NSNotificationCenter.defaultCenter().addObserver(self, selector:"keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector:"keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)
}

override func viewDidDisappear(animated: Bool) {
    super.viewDidDisappear(animated)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().removeObserver(self, name: UIKeyboardWillHideNotification, object: nil)
}

func keyboardWillShow(notification: NSNotification) {
    if keyboardAdjusted == false {
        lastKeyboardOffset = getKeyboardHeight(notification)
        view.frame.origin.y -= lastKeyboardOffset
        keyboardAdjusted = true
    }
}

func keyboardWillHide(notification: NSNotification) {
    if keyboardAdjusted == true {
        view.frame.origin.y += lastKeyboardOffset
        keyboardAdjusted = false
    }
}

func getKeyboardHeight(notification: NSNotification) -> CGFloat {
    let userInfo = notification.userInfo
    let keyboardSize = userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue
    return keyboardSize.CGRectValue().height
}

}

您可以检查本教程move uitextfield，这样键盘就不会隐藏它。

您可以在这里找到这个的演示

或者，当键盘显示为Swift时，可以检查此StackOverflow移动文本字段的答案。

最好的答案是通过更新这样的底部约束来管理

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func keyboardWasShown(notification: NSNotification) {
     var info = notification.userInfo!
     var keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()

     UIView.animateWithDuration(0.1, animations: { () -> Void in
       self.bottomConstraint.constant = keyboardFrame.size.height + 20
  })
}

您应该将文本字段放入UIScrollView，并在UIKeyboardDidShowNotification上调整其contentInset。

阅读本帮助页面：https://developer.apple.com/library/ios/documentation/stringstextfonts/conceptive/textandwebiphoneos/keyboardmanagement/keyboardmanagement.html//apple_-ref/doc/uid/tp40009542-ch5-sw7