如何使键盘在屏幕上显示视图时向上推？Xcode Swift[重复]

Question

所以我有一个带有文本字段的视图，但是文本字段在底部。当我单击键盘时，它会弹出并覆盖文本字段，这是我的问题。我想知道当键盘出现时是否有可能将视图的其余部分向上推？

Answer 1

您应该将文本字段放入UIScrollView并调整其contentInset在UIKeyboardddShowNotify上。

阅读此帮助页面：https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html#//apple_ref/doc/uid/TP40009542-CH5-SW7

Answer 2

您可以选中此教程移动UITextField，以便键盘不会隐藏它

你会在这里找到演示

或者你可以检查这个stackoverflow的答案当键盘出现迅速移动文本字段

最好的答案是通过如下方式更新底部约束进行管理

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
  })
}

Answer 3

您可以注册视图控制器，以便在即将显示键盘时收到通知，然后向上推视图。

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
}

}