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

最简单的不需要任何代码的方法:

下载KeyboardLayoutConstraint.swift并将文件添加(拖放)到你的项目中,如果你还没有使用Spring动画框架的话。 在你的故事板中,为对象/视图/文本字段创建一个底部约束,选择约束(双击它)并在标识检查器中,将其类从NSLayoutConstraint更改为KeyboardLayoutConstraint。 完成了!

物体会随着键盘同步自动移动。

其他回答

如果你像我一样,使用自动布局,在模拟器上运行应用程序时不使用键盘。这可能是因为苹果让你使用你电脑的键盘作为第一个键盘。

显示设备上的键盘:

shift + cmd + K

听起来很愚蠢,但我很想在3小时前找到这个答案:)

我的做法如下:

class SignInController: UIViewController , UITextFieldDelegate {

@IBOutlet weak var scrollView: UIScrollView!

// outlet declartion
@IBOutlet weak var signInTextView: UITextField!

var kbHeight: CGFloat!

/**
*
* @method viewDidLoad
*
*/

override func viewDidLoad() {
    super.viewDidLoad()

    self.signInTextView.delegate = self

}// end viewDidLoad

/**
*
* @method viewWillAppear
*
*/

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)

    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)

    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)

}// end viewWillAppear

/**
*
* @method viewDidAppear
*
*/

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)


}// end viewDidAppear

/**
*
* @method viewWillDisappear
*
*/
override func viewWillDisappear(animated: Bool) {
    super.viewWillDisappear(animated)
    NSNotificationCenter.defaultCenter().removeObserver(self)
}

/**
*
* @method textFieldShouldReturn
* retun the keyboard value
*
*/

// MARK -
func textFieldShouldReturn(textField: UITextField) -> Bool {
    signInTextView.resignFirstResponder()
    return true;

}// end textFieldShouldReturn

// MARK - keyboardWillShow
func keyboardWillShow(notification: NSNotification) {
    if let userInfo = notification.userInfo {
        if let keyboardSize =  (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
            kbHeight = keyboardSize.height
            self.animateTextField(true)
        }
    }
}// end keyboardWillShow

// MARK - keyboardWillHide
func keyboardWillHide(notification: NSNotification) {
    self.animateTextField(false)
}// end keyboardWillHide

// MARK - animateTextField
func animateTextField(up: Bool) {
    var movement = (up ? -kbHeight : kbHeight)

    UIView.animateWithDuration(0.3, animations: {
        self.view.frame = CGRectOffset(self.view.frame, 0, movement)
    })
}// end animateTextField

/**
*
* @method didReceiveMemoryWarning
*
*/

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.

}// end didReceiveMemoryWarning


}// end SignInController

我正在使用swift 4,我解决了这个问题,没有使用任何额外的底部约束,看我的代码在这里。这对我的案子很有帮助

1)在did load中添加通知观察者

override func viewDidLoad() { super.viewDidLoad () setupManager () //加载视图后进行任何额外的设置。 addobserver (self, selector: #selector(self. keyboardwillshow), name: NSNotification.Name。对象:nil) addobserver (self, selector: #selector(self. keyboardwillhide), name: NSNotification.Name。对象:nil) }

2)删除通知观察者

Deinit { NotificationCenter.default.removeObserver(self) }

3)增加键盘显示/隐藏方法

 @objc func keyboardWillShow(notification: NSNotification) {
            if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
                UIView.animate(withDuration: 0.1, animations: { () -> Void in
                    self.view.frame.origin.y -= keyboardSize.height
                    self.view.layoutIfNeeded()
                })
            }
        }

@objc func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            UIView.animate(withDuration: 0.1, animations: { () -> Void in
                self.view.frame.origin.y += keyboardSize.height
                self.view.layoutIfNeeded()
            })
        }
    }

4)添加textfield delegate和touchesBegan方法。usefull用于在屏幕上的textfield外触摸时隐藏键盘

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        view.endEditing(true)

    }

你可以使用这个库,只需一行代码在appDidFinishedLaunching和你完成。

func application(application: UIApplication,didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    IQKeyboardManager.sharedManager().enable = true
    return true
}

IQKeyboardManager -调整视图每当键盘出现 link - https://github.com/hackiftekhar/IQKeyboardManager

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
    }
    } }