向上移动键盘上方的文本字段

Question

我尝试使用某些东西来向上移动视图，因为当我进入表单末尾并点击最后一个文本字段时，我看不到我写的内容，因为键盘出现在文本字段上方，所以我发现了一些东西，但是在这里如果我点击视图顶部的文本字段，这将通过向上隐藏，这就是代码：

override func viewDidLoad() {

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

}


func keyboardWillShow(notification: NSNotification) {

    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        self.view.frame.origin.y -= keyboardSize.height
    }

}

func keyboardWillHide(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
        self.view.frame.origin.y += keyboardSize.height
    }
}

但是这里还有一个问题，当我在另一个文本字段上点击两次时，会出现一个黑色块。

所以我不想做的是检测文本字段并将键盘放在它下面，以便向上移动文本字段。并检测键盘是否已经在这里不要显示黑色块。但是我还没有找到解决办法。

Answer 1

我在我的项目中使用了这个代码：

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

    // Register Keyboard Notification
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillHide:", name: UIKeyboardWillHideNotification, object: nil)
}

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

    // Remove Keyboard notification observer
    NSNotificationCenter.defaultCenter().removeObserver(self)
}

func keyboardWillShow(notification: NSNotification)
{
    var userInfo = notification.userInfo!
    var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
    keyboardFrame = self.view.convertRect(keyboardFrame, fromView: nil)

    var contentInset:UIEdgeInsets = self.scrollView.contentInset
    contentInset.bottom = keyboardFrame.size.height - 30 //Set this value (30) according to your code as i have navigation tool bar for next and prev.
    self.scrollView.contentInset = contentInset
}

func keyboardWillHide(notification: NSNotification) {
    let contentInset:UIEdgeInsets = UIEdgeInsetsZero
    self.scrollView.contentInset = contentInset
}

希望对你有帮助！！

Answer 2

添加一个 bool 属性 self.isKeyBoardUp

在keyboardWillShow中： 如果 isKeyBoardUp 返回，则将其设置为 true 并执行您的操作。

在键盘中将隐藏： 如果不是 isKeyBoardUp 返回，则将其设置为 false 并执行您的操作。

Answer 3

请检查此代码，我正在尝试并适用于从

获取此代码

Move textfield when keyboard appears swift

 func keyboardWasShown(notification: NSNotification) {
   var info = notification.userInfo!
   var keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue() 

   UIView.animateWithDuration(0.1, animations: { () -> Void in
    self.bottomConstraint.constant = keyboardFrame.size.height + 20
   })
 }