键盘管理阻塞 UITextView

Question

所以我遵循了关于在键盘上方移动文本的苹果指南，当文本字段位于滚动视图上时，这可以正常工作，但是滚动视图包含一个集合视图，并且该集合视图加载一个包含文本字段的笔尖，它们都被分配为委托，当他们被按下时，委托的 didEdit/endEdit 功能确实会触发，但是键盘管理代码没有按预期工作......这是键盘管理代码

http://creativecoefficient.net/swift/keyboard-management/

这里是正在使用的代码的链接..

func keyboardWillBeShown(sender: NSNotification) {
    print("KEYBOARD SHOWN")

    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)
    print(keyboardSize.height)
    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 activeTextFieldOrigin: CGPoint? = activeTextFieldRect?.origin
    if (!CGRectContainsPoint(aRect, activeTextFieldOrigin!)) {
    let dHeight = displayView.frame.height

    ScrollView.scrollRectToVisible(activeTextFieldRect!, animated:true) 
}

此代码的问题在于 activeTextfield 与视图的文本字段配合得很好，当我单击文本字段时会打印这些点

activetextfield Frame
(0.0, 20.5, 150.0, 20.5)

但是当我点击集合视图笔尖文本字段时，我得到了这些点

0.0, 0.0, 259.5, 30.0

我相信这是键盘阻止文本字段的原因，activetextfieldRect 给了错误的坐标

ScrollView.scrollRectToVisible(activeTextFieldRect!, animated:true)  

有人可以就如何解决这个问题给我一些指导吗？

Answer 1

func keyboardWillBeShown(sender: NSNotification) {
    print("KEYBOARD SHOWN")
    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.ScrollView.frame
    aRect.size.height -= keyboardSize.height
    let activeTextFieldRect: CGRect? = activeTextField?.frame
    let activeTextFieldOrigin: CGPoint? = TextfieldPoint
    if (!CGRectContainsPoint(aRect, activeTextFieldOrigin!)) {


        ScrollView.scrollRectToVisible(testBox, animated:true)
    }

       }

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


func textFieldDidBeginEditing(textField: UITextField) {



    let point: CGPoint = textField.convertPoint(CGPointZero, toView: self.ScrollView);

TextfieldPoint = point

    testBox = CGRectMake(point.x, point.y, textField.frame.width, 100 );

    //let indexPath:NSIndexPath? = collview1.indexPathForItemAtPoint(point)

    print("TEXTFIELD EDIT")
    activeTextField = textField

    print(activeTextField)





    ScrollView.scrollEnabled = true
}

func textFieldDidEndEditing(textField: UITextField) {

    print("TEXTFIELD STOP EDIT")
    activeTextField = nil
    ScrollView.scrollEnabled = false
}

我想它真的很乱，我知道文本字段所在的位置，用它制作了 CGRect，如果键盘与文本重叠，视图会调整，在 iPhone 4s 到 6s plus 上测试，工作正常

Answer 2

是的，你是对的。 scrollRectToVisible 收到错误的坐标，这就是它不起作用的原因。

要实现您的目标，请考虑使用scrollToItemAtIndexPath(_:atScrollPosition:animated:)。您所需要的只是要移动的单元格的IndexPath。我猜你可以把这些信息放在你的textField 的tag 属性中（例如）。

类似这样的：

// inside cellForItem..
cell.textField.tag = indexPath.item

// inside keyboardWillShown
let indexPath = NSIndexPath(forItem: activeTextField.tag inSection: 0) // assume that you have one section
collectionView.scrollToItemAtIndexPath(indexPath, atScrollPosition: .Top, animated: true) // or try .Center position