Question

我在我的一个VC中有一个uiscrollview。在scrollView中，我有多个TF，按钮等。根据Apple文档，我使用下面的代码在调用键盘通知时向上移动scrollView，以推高隐藏的文本字段。但是，当我关闭键盘时，scrollView不会重置或向下移动，它只是停留在＆＃34;向上移动＆＃34;位置。

我在这里遗漏了什么吗？我有一个名为的成员变量：

var activeTextField: UITextField!

我是否正确使用了委托方法？

(func registerForKeyboardNotifications() {
    let notificationCenter = NSNotificationCenter.defaultCenter()
    notificationCenter.addObserver(self,
        selector: "keyboardWillBeShown:",
        name: UIKeyboardWillShowNotification,
        object: nil)
    notificationCenter.addObserver(self,
        selector: "keyboardWillBeHidden:",
        name: UIKeyboardWillHideNotification,
        object: nil)
}

func keyboardWillBeShown(sender: NSNotification) {
    let info: NSDictionary = sender.userInfo!
    let value: NSValue = info.valueForKey(UIKeyboardFrameBeginUserInfoKey) as NSValue
    let keyboardSize: CGSize = value.CGRectValue().size
    let contentInsets: UIEdgeInsets = UIEdgeInsetsMake(0.0, 0.0, keyboardSize.height, 0.0)
    scrollView.contentInset = contentInsets
    scrollView.scrollIndicatorInsets = contentInsets

    // If active text field is hidden by keyboard, scroll it so it's visible
    // Your app might not need or want this behavior.
    var aRect: CGRect = self.view.frame
    aRect.size.height -= keyboardSize.height
    let activeTextFieldRect: CGRect? = activeTextField?.frame
    let activeTextFieldOrigin: CGPoint? = activeTextFieldRect?.origin
    if (!CGRectContainsPoint(aRect, activeTextFieldOrigin!)) {
        scrollView.scrollRectToVisible(activeTextFieldRect!, animated:true)
    }
}

// Called when the UIKeyboardWillHideNotification is sent
func keyboardWillBeHidden(sender: NSNotification) {
    let contentInsets: UIEdgeInsets = UIEdgeInsetsZero
    scrollView.contentInset = contentInsets
    scrollView.scrollIndicatorInsets = contentInsets
}

func textFieldDidBeginEditing(textField: UITextField!) {
    activeTextField = textField
    scrollView.scrollEnabled = true
}

func textFieldDidEndEditing(textField: UITextField!) {
    activeTextField = nil
    scrollView.scrollEnabled = false
}


override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    self.registerForKeyboardNotifications()
}

override func viewDidDisappear(animated: Bool) {
    super.viewWillDisappear(animated)
    NSNotificationCenter.defaultCenter().removeObserver(self)
}

Answer 1

您必须更改 keyboardWillBeHidden

的第一行

而不是：

let contentInsets: UIEdgeInsets = UIEdgeInsetsZero

写：

let insets: UIEdgeInsets = UIEdgeInsetsMake(self.scrollView.contentInset.top, 0, 0, 0)

我希望能帮到你

Answer 2

我这样做了，它对我有用。似乎比你的方式容易多了。我为我的项目使用了UITextView。但它应该与UITextField一样。 - / + 25只是为了让标题显示出来。

func textViewDidBeginEditing(textView: UITextView) {
    myScrollView.setContentOffset(CGPointMake(0, textView.frame.origin.y-25), animated: true)
}

func textViewDidEndEditing(textView: UITextView) {
    myScrollView.setContentOffset(CGPointMake(0, -textView.frame.origin.y+25), animated: true)
}

Answer 3

除了Anna的答案，你也应该使用 let contentInsets: UIEdgeInsets = UIEdgeInsetsMake(self.scrollView.contentInset.top, 0.0, keyboardSize.height, 0.0)中的keyboardWillBeShown，以避免文本视图在导航栏下方消失。

Answer 4

问题在于

var activeTextField: UITextField!

您应该将activeTextField替换为其他UITextField（例如，故事板中存在的文本字段），您可以发现当键盘出现时，滚动视图可以滚动。

Swift，移动键盘后面的内容在解散后不会重置

4 个答案: