Swift,移动键盘后面的内容在解散后不会重置

Question

我在我的一个VC中有一个uiscrollview.在scrollView中,我有多个TF,按钮等.我使用下面的代码,根据Apple文档,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"向上移动"的位置.

我在这里错过了什么吗？我有一个名为的类的成员变量:

var activeTextField: UITextField!

我是否正确使用委托方法？

(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

你必须改变第一行keyboardWillBeHidden

代替：

let contentInsets: UIEdgeInsets = UIEdgeInsetsZero

写：

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

我希望对你有帮助