当键盘出现时，如何向上移动最后一个文本字段的视图？

Question

我有一个视图，里面有 6 个文本字段，但我想在单击最后一个文本字段时向上移动视图，我可以在最后一个文本字段中输入值。

这是我的代码，但它适用于所有文本字段：-

 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()
} 

那么对于特定的文本字段，我该如何向上移动视图（键盘大小）

谢谢

Answer 1

@IBOutlet var scrollView: UIScrollView!
@IBOutlet var contentView: UIView!
var textFieldActive:UITextField!

override func viewDidLoad() {
    super.viewDidLoad()

    //Keyboard notification
    NotificationCenter.default.addObserver(self,selector: #selector(keyboardWasShown),name:NSNotification.Name.UIKeyboardDidShow,
                                                     object: nil)
    NotificationCenter.default.addObserver(self,selector: #selector(keyboardWillHide),name:NSNotification.Name.UIKeyboardWillHide,
                                                     object: nil)
    // Do any additional setup after loading the view.
}



func textFieldDidBeginEditing(_ textField: UITextField){

    textFieldActive = textField
}



// MARK: - Keyboard notification Method
func keyboardWasShown(notification: NSNotification)
{
    let userInfo = notification.userInfo
    let keyboardSize = (userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue
    let contentInset = UIEdgeInsetsMake(0.0, 0.0, (keyboardSize?.height)!+100,  0.0)
    self.scrollViewGroupMakeTakers.contentInset = contentInset
    self.scrollViewGroupMakeTakers.scrollIndicatorInsets = contentInset

    // Step 3: Scroll the target text field into view.
    var aRect: CGRect = self.contentViewMakeTakers.frame;
    aRect.size.height -= (keyboardSize?.height)!+100
    if (!aRect.contains(textFieldActive!.frame.origin))
    {

        let scrollPoint: CGPoint = CGPoint(x: 0.0, y: textFieldActive!.frame.origin.y - (keyboardSize!.height-150));            
self.scrollViewGroupMakeTakers.setContentOffset(scrollPoint, animated: true)
    }
}
func keyboardWillHide(notification: NSNotification)
{
    let contentInsets : UIEdgeInsets = UIEdgeInsets.zero
    scrollViewGroupMakeTakers.contentInset = contentInsets;
    scrollViewGroupMakeTakers.scrollIndicatorInsets = contentInsets;
}

Answer 2

试试这个-

 func textFieldShouldReturn(textField: UITextField) -> Bool {

     if textField == lastTextField{

            view.frame.origin.y -= 50  //Or 100, 200 as you required
             performAction()

        }
}



func performAction() {

        lastTextField.becomeFirstResponder()
        otherTextField.resignFirstResponder()

    }

Answer 3

假设您使用的是 autoLayout

我想象你所有的UITextField 都存在于一个单独的UIScrollView 中。此外，这个UISCrollView 将对其 superView 有一个底部约束。为这个底部间距垂直约束创建一个IBOutlet 到它的超级视图。

注意：即使它不在UIScrollView 内，您也可以通过简单地采用最低UITextField 的底部约束来执行此操作，但这会迫使您的另一个UITextFields 最好关闭屏幕把它放在UIScrollView中。

在您的viewDidLoad 设置观察者如下 -

func viewDidLoad(){

    super.viewDidLoad()

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

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

//and then:
//MARK: Animate Keyboard
func keyboardWillShow(notification : NSNotification){

    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {

        animateKeyboard(withConstraintValue: keyboardSize.size.height)
    }
}

func keyboardWillHide(notification : NSNotification){

    animateKeyboard(withConstraintValue: 0)
}

func animateKeyboard(withConstraintValue: CGFloat){

    scrollViewBottomSpaceConstraint.constant = withConstraintValue

    UIView.animate(withDuration: 0.3, animations: {

        self.view.layoutIfNeeded()
    })
}