Question

我对Objective C并不熟悉，并且想知道Swift中是否有解决方案。

这是我正在玩的非常简单的SingleView应用程序。 UIView继承自UIControl。

我没有UIScrollView，我不能只移动整个视图吗？我相信键盘是独立的。

Answer 1

Apple的推荐记录在Swift中。

确保您的控件位于ScrollView上，并在选择器字符串中记下冒号。我使用变量（activeField）来指示活动文本字段。

var activeField: UITextField?

@IBAction func editingBegan(sender: UITextField) {
    activeField = sender
}

 override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    let center = NSNotificationCenter.defaultCenter()
    center.addObserver(self, selector: "keyboardOnScreen:", name: UIKeyboardDidShowNotification, object: nil)
    center.addObserver(self, selector: "keyboardOffScreen:", name: UIKeyboardDidHideNotification, object: nil)

}

func keyboardOnScreen(notification: NSNotification){
    let info: NSDictionary  = notification.userInfo!
    let kbSize = info.valueForKey(UIKeyboardFrameEndUserInfoKey)?.CGRectValue().size
    let contentInsets:UIEdgeInsets  = UIEdgeInsetsMake(0.0, 0.0, kbSize!.height, 0.0)
    scrollView.contentInset = contentInsets
    scrollView.scrollIndicatorInsets = contentInsets
    var aRect: CGRect = self.view.frame
    aRect.size.height -= kbSize!.height
    //you may not need to scroll, see if the active field is already visible
    if (!CGRectContainsPoint(aRect, activeField!.frame.origin) ) {
        let scrollPoint:CGPoint = CGPointMake(0.0, activeField!.frame.origin.y - kbSize!.height)
        scrollView.setContentOffset(scrollPoint, animated: true)
    }

}


func keyboardOffScreen(notification: NSNotification){
    let contentInsets:UIEdgeInsets = UIEdgeInsetsZero
    scrollView.contentInset = contentInsets
    scrollView.scrollIndicatorInsets = contentInsets
}

Answer 2

我在这里使用了代码。不需要添加scrollview

Move uitextfield up when keyboard shows

func textFieldDidBeginEditing(textField: UITextField) {
        animateViewMoving(true, moveValue: 100)
}
func textFieldDidEndEditing(textField: UITextField) {
        animateViewMoving(false, moveValue: 100)
}

func animateViewMoving (up:Bool, moveValue :CGFloat){
    var movementDuration:NSTimeInterval = 0.3
    var movement:CGFloat = ( up ? -moveValue : moveValue)
    UIView.beginAnimations( "animateView", context: nil)
    UIView.setAnimationBeginsFromCurrentState(true)
    UIView.setAnimationDuration(movementDuration )
    self.view.frame = CGRectOffset(self.view.frame, 0,  movement)
    UIView.commitAnimations()
}

Answer 3

https://developer.apple.com/library/ios/documentation/StringsTextFonts/Conceptual/TextAndWebiPhoneOS/KeyboardManagement/KeyboardManagement.html

查看＆＃34;接收键盘通知＆＃34;。

该文档中的代码示例都是Obj-C，因此您必须自己将其转换为swift，但正如@jtbandes所说，它本身并不是一个快速的问题。

Answer 4

我刚刚将上面的ChinLoong答案更新为Swift 3语法。不幸的是，我还不允许添加评论。

func textFieldDidBeginEditing(_ textField: UITextField) {
    animateViewMoving(up: true, moveValue: 100)
}
func textFieldDidEndEditing(_ textField: UITextField) {
    animateViewMoving(up: false, moveValue: 100)
}

func animateViewMoving (up:Bool, moveValue :CGFloat){
    let movementDuration:TimeInterval = 0.3
    let movement:CGFloat = ( up ? -moveValue : moveValue)
    UIView.beginAnimations( "animateView", context: nil)
    UIView.setAnimationBeginsFromCurrentState(true)
    UIView.setAnimationDuration(movementDuration )
    self.view.frame = self.view.frame.offsetBy(dx: 0,  dy: movement)
    UIView.commitAnimations()
}

键盘覆盖时向上移动文本字段

4 个答案: