使用滚动视图时将对象保持在原位

Question

我几天前发布了这个，但似乎找不到有效的解决方案。

(1)这是画面的整体布局。该按钮位于滚动视图内，因此当出现该按钮时，该按钮将被推到用户视图中。然后在第一响应者辞职时退缩。我根本不希望文本字段移动。我想将它们保存在我放置它们的位置。只有按钮是我要移动的。

(1) https://i.stack.imgur.com/O8iJy.png

(2)键盘出现时的样子结果。它最终将文本字段推出视图。

(2) https://i.stack.imgur.com/VDhdI.png

这是我正在使用的代码： @IBOutlet weak var ScrollView: UIScrollView!

@IBOutlet weak var TextField: UITextField!

@IBOutlet weak var testButton: UIButton!

@IBOutlet weak var testView: UIView!
func closeKeyboard(){
    self.view.endEditing(true)
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    closeKeyboard()
}

    override func viewDidLoad() {
    super.viewDidLoad()
    NotificationCenter.default.addObserver(self, selector: #selector(scrollviewtest.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)

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

    }

func keyboardWillShow(notification: NSNotification) {

    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y == 0{
            self.view.frame.origin.y -= keyboardSize.height
        }
    }

}

func keyboardWillHide(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y != 0{
            self.view.frame.origin.y += keyboardSize.height
        }
    }

Answer 1

而不是

self.view.frame.origin.y -= keyboardSize.height

在

keyboardWillShow

您必须为按钮底部创建 NSLayoutConstraint 以滚动视图底部，然后使用此约束进行操作。代码将如下所示。

@IBOutlet weak var buttonBottomConstraint: NSLayoutConstraint!
.... 

func keyboardWillShow(notification: NSNotification) {

    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y == 0 {
            self.buttonBottomConstraint.constant -= keyboardSize.height
            self.view.layoutIfNeeded()
        }
    }
}

func keyboardWillHide(notification: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
        if self.view.frame.origin.y != 0 {
            self.buttonBottomConstraint.constant += keyboardSize.height
        }
    }
}

约束看起来像这样：

使用滚动视图时将对象保持在原位

Keep objects in place when scroll view is used

scrollview

textfield

ios

swift