我假设这发生在UIViewController上。如果是这样，您可以设置以下两个函数，以便在键盘显示/隐藏时调用，并在其块中做出适当的响应。

设置 UIViewController：

class ViewController: UIViewController, UITextFieldDelegate... {

    var frameView: UIView!

首先，在< code>viewDidLoad()中:

override func viewDidLoad() {

    self.frameView = UIView(frame: CGRect(x: 0, y: 0, width: self.view.bounds.width, height: self.view.bounds.height))

    // Keyboard stuff.
    let center: NotificationCenter = NotificationCenter.default
    center.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
    center.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)

}

然后实现以下两个函数来响应上面的< code>viewDidLoad()中定义的< code>NotificationCenter函数。我给你一个移动整个视图的例子，但是你也可以仅仅动画化< code>UITextField的

@objc func keyboardWillShow(notification: NSNotification) {
    let info:NSDictionary = notification.userInfo! as NSDictionary
    let keyboardSize = (info[UIResponder.keyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue

    let keyboardHeight: CGFloat = keyboardSize.height

    let _: CGFloat = info[UIResponder.keyboardAnimationDurationUserInfoKey] as! NSNumber as! CGFloat


    UIView.animate(withDuration: 0.25, delay: 0.25, options: .curveEaseInOut, animations: {
        self.frameView.frame = CGRect(x: 0, y: (self.frameView.frame.origin.y - keyboardHeight), width: self.view.bounds.width, height: self.view.bounds.height)
    }, completion: nil)
}

@objc func keyboardWillHide(notification: NSNotification) {
    let info: NSDictionary = notification.userInfo! as NSDictionary
    let keyboardSize = (info[UIResponder.keyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue

    let keyboardHeight: CGFloat = keyboardSize.height

    let _: CGFloat = info[UIResponder.keyboardAnimationDurationUserInfoKey] as! NSNumber as! CGFloat

    UIView.animate(withDuration: 0.25, delay: 0.25, options: .curveEaseInOut, animations: {
        self.frameView.frame = CGRect(x: 0, y: (self.frameView.frame.origin.y + keyboardHeight), width: self.view.bounds.width, height: self.view.bounds.height)
    }, completion: nil)

}

离开视图时不要忘记删除通知

override func viewWillDisappear(_ animated: Bool) {
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
}

这是Swift中的简单解决方案。我翻译了一些过去对我有用的Objective-C代码。

func textFieldDidBeginEditing(textField: UITextField) { // became first responder

    //move textfields up
    let myScreenRect: CGRect = UIScreen.mainScreen().bounds
    let keyboardHeight : CGFloat = 216

    UIView.beginAnimations( "animateView", context: nil)
    var movementDuration:NSTimeInterval = 0.35
    var needToMove: CGFloat = 0

    var frame : CGRect = self.view.frame
    if (textField.frame.origin.y + textField.frame.size.height + /*self.navigationController.navigationBar.frame.size.height + */UIApplication.sharedApplication().statusBarFrame.size.height > (myScreenRect.size.height - keyboardHeight)) {
    needToMove = (textField.frame.origin.y + textField.frame.size.height + /*self.navigationController.navigationBar.frame.size.height +*/ UIApplication.sharedApplication().statusBarFrame.size.height) - (myScreenRect.size.height - keyboardHeight);
    }

    frame.origin.y = -needToMove
    self.view.frame = frame
    UIView.commitAnimations()
}

func textFieldDidEndEditing(textField: UITextField) {
        //move textfields back down
        UIView.beginAnimations( "animateView", context: nil)
        var movementDuration:NSTimeInterval = 0.35
        var frame : CGRect = self.view.frame
        frame.origin.y = 0
        self.view.frame = frame
        UIView.commitAnimations()
}

Swift 4代码，它很简单而不是用很多NSNotificationCenter之类的东西，然后计算所有东西的高度，做条件使得这个更复杂，

下面编码了实现这一点的简单方法，它可以将视图上移。

func textFieldDidBeginEditing(_ textField: UITextField) {
        moveTextField(textfield: textField, moveDistance: -250, up: true)
}

func textFieldDidEndEditing(_ textField: UITextField) {
        moveTextField(textfield: textField, moveDistance: -250, up: false)
}

func moveTextField(textfield: UITextField, moveDistance: Int, up: Bool) {
    let moveDuration = 0.3
    let movement: CGFloat = CGFloat(up ? moveDistance: -moveDistance)
    UIView.beginAnimations("animateTextField", context: nil)
    UIView.setAnimationBeginsFromCurrentState(true)
    UIView.setAnimationDuration(moveDuration)
    self.view.frame = self.view.frame.offsetBy(dx: 0, dy: movement)
    UIView.commitAnimations()
}

您可以根据文本字段的位置更改-250值。