移动文本字段时，键盘出现迅速

我使用Swift与iOS编程，我使用这段代码来移动UITextField，但它不起作用。我正确地调用了函数keyboardWillShow，但是文本字段没有移动。我正在使用自动布局。

override func viewDidLoad() {
    super.viewDidLoad()
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name:UIKeyboardWillShowNotification, object: nil);
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: nil);
}

deinit {
    NSNotificationCenter.defaultCenter().removeObserver(self);
}

func keyboardWillShow(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        //let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)

        var frame = self.ChatField.frame
        frame.origin.y = frame.origin.y - keyboardSize.height + 167
        self.chatField.frame = frame
        println("asdasd")
    }
}

当前回答

我已采取以下方式:

当textfield superview为view时，这很有用

class AdminLoginViewController: UIViewController,
UITextFieldDelegate{

    @IBOutlet weak var txtUserName: UITextField!
    @IBOutlet weak var txtUserPassword: UITextField!
    @IBOutlet weak var btnAdminLogin: UIButton!

    private var activeField : UIView?

    var param:String!
    var adminUser : Admin? = nil
    var kbHeight: CGFloat!

    override func viewDidLoad()
    {
        self.addKeyBoardObserver()
        self.addGestureForHideKeyBoard()
    }

    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func addGestureForHideKeyBoard()
    {
        let tapGesture = UITapGestureRecognizer(target: self, action: Selector("hideKeyboard"))
        tapGesture.cancelsTouchesInView = false
        view.addGestureRecognizer(tapGesture)
    }

    func hideKeyboard() {
        self.view.endEditing(true)
    }

    func addKeyBoardObserver(){

        NSNotificationCenter.defaultCenter().addObserver(self, selector: "willChangeKeyboardFrame:",
name:UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "willChangeKeyboardFrame:",
name:UIKeyboardWillHideNotification, object: nil)
    }

    func removeObserver(){
        NSNotificationCenter.defaultCenter().removeObserver(self)
    }

    //MARK:- textfiled Delegate

    func textFieldShouldBeginEditing(textField: UITextField) -> Bool
    {
         activeField = textField

        return true
    }
    func textFieldShouldEndEditing(textField: UITextField) -> Bool
    {
        if activeField == textField
        {
            activeField = nil
        }

        return true
    }

    func textFieldShouldReturn(textField: UITextField) -> Bool {

        if txtUserName == textField
        {
            txtUserPassword.becomeFirstResponder()
        }
        else if (textField == txtUserPassword)
        {
            self.btnAdminLoginAction(nil)
        }
        return true;
    }

    func willChangeKeyboardFrame(aNotification : NSNotification)
    {
       if self.activeField != nil && self.activeField!.isFirstResponder()
    {
        if let keyboardSize =  (aNotification.userInfo![UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue()
        {
            let dy = (self.activeField?.superview?.convertRect((self.activeField?.frame)!, toView: view).origin.y)!

            let height = (self.view.frame.size.height - keyboardSize.size.height)

            if dy > height
            {
                var frame = self.view.frame

                frame.origin.y = -((dy - height) + (self.activeField?.frame.size.height)! + 20)

                self.view.frame = frame
            }
        }
    }
    else
    {
        var frame = self.view.frame
        frame.origin.y = 0
        self.view.frame = frame
    }
    } }

2015-12-15 13:13:15

其他回答

最好的方法是使用NotificationCenter来捕捉键盘动作。您可以按照这篇短文中的步骤操作 https://medium.com/@demirciy/keyboard-handling-deb1a96a8207

2018-04-06 08:34:58

以下是我对Swift 2.2的解决方案:

首先注册键盘显示/隐藏通知

NSNotificationCenter.defaultCenter().addObserver(self,
                                                 selector: #selector(MessageThreadVC.keyboardWillShow(_:)),
                                                 name: UIKeyboardWillShowNotification,
                                                 object: nil)
NSNotificationCenter.defaultCenter().addObserver(self,
                                                 selector: #selector(MessageThreadVC.keyboardWillHide(_:)),
                                                 name: UIKeyboardWillHideNotification,
                                                 object: nil)

然后在与这些通知相对应的方法中，向上或向下移动主视图

func keyboardWillShow(sender: NSNotification) {
if let keyboardSize = (sender.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.CGRectValue() {
  self.view.frame.origin.y = -keyboardSize.height
  }
}

func keyboardWillHide(sender: NSNotification) {
self.view.frame.origin.y = 0
}

诀窍在于“keyboardWillShow”部分，每次“QuickType建议栏”被展开或折叠时，该部分都会被调用。然后我们总是设置主视图的y坐标等于键盘总高度的负值(包括或不包括“QuickType栏”部分)。

最后不要忘记删除观察者

deinit {
NSNotificationCenter.defaultCenter().removeObserver(self)
}

2016-04-12 13:33:51

在Swift 4.0 -

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()
    }

2018-05-07 06:38:37

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

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

func keyboardWillShow(_ notification:Notification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        tableView.contentInset = UIEdgeInsetsMake(0, 0, keyboardSize.height, 0)
    }
}

func keyboardWillHide(_ notification:Notification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        tableView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0)
    }
}

2017-03-10 10:09:20

我已采取以下方式:

当textfield superview为view时，这很有用

class AdminLoginViewController: UIViewController,
UITextFieldDelegate{

    @IBOutlet weak var txtUserName: UITextField!
    @IBOutlet weak var txtUserPassword: UITextField!
    @IBOutlet weak var btnAdminLogin: UIButton!

    private var activeField : UIView?

    var param:String!
    var adminUser : Admin? = nil
    var kbHeight: CGFloat!

    override func viewDidLoad()
    {
        self.addKeyBoardObserver()
        self.addGestureForHideKeyBoard()
    }

    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func addGestureForHideKeyBoard()
    {
        let tapGesture = UITapGestureRecognizer(target: self, action: Selector("hideKeyboard"))
        tapGesture.cancelsTouchesInView = false
        view.addGestureRecognizer(tapGesture)
    }

    func hideKeyboard() {
        self.view.endEditing(true)
    }

    func addKeyBoardObserver(){

        NSNotificationCenter.defaultCenter().addObserver(self, selector: "willChangeKeyboardFrame:",
name:UIKeyboardWillShowNotification, object: nil)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "willChangeKeyboardFrame:",
name:UIKeyboardWillHideNotification, object: nil)
    }

    func removeObserver(){
        NSNotificationCenter.defaultCenter().removeObserver(self)
    }

    //MARK:- textfiled Delegate

    func textFieldShouldBeginEditing(textField: UITextField) -> Bool
    {
         activeField = textField

        return true
    }
    func textFieldShouldEndEditing(textField: UITextField) -> Bool
    {
        if activeField == textField
        {
            activeField = nil
        }

        return true
    }

    func textFieldShouldReturn(textField: UITextField) -> Bool {

        if txtUserName == textField
        {
            txtUserPassword.becomeFirstResponder()
        }
        else if (textField == txtUserPassword)
        {
            self.btnAdminLoginAction(nil)
        }
        return true;
    }

    func willChangeKeyboardFrame(aNotification : NSNotification)
    {
       if self.activeField != nil && self.activeField!.isFirstResponder()
    {
        if let keyboardSize =  (aNotification.userInfo![UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue()
        {
            let dy = (self.activeField?.superview?.convertRect((self.activeField?.frame)!, toView: view).origin.y)!

            let height = (self.view.frame.size.height - keyboardSize.size.height)

            if dy > height
            {
                var frame = self.view.frame

                frame.origin.y = -((dy - height) + (self.activeField?.frame.size.height)! + 20)

                self.view.frame = frame
            }
        }
    }
    else
    {
        var frame = self.view.frame
        frame.origin.y = 0
        self.view.frame = frame
    }
    } }

2015-12-15 13:13:15

移动文本字段时，键盘出现迅速

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