问题描述

我有一个搜索栏文本字段和一个表格视图(用于谷歌自动完成)，当键盘进入视图时，我想翻译它们.我成功地做到了这一点，但是，我收到了关于我的约束的警告/错误.我在此视图上通过情节提要使用自动布局，并尝试在显示/隐藏键盘之前/之后禁用/启用约束，但我仍然收到这些错误.我没有正确禁用自动布局吗?我遵循了 this SO回应.

I have a search bar text field and a table view (for google auto complete) that I would like to translate up when the keyboard comes into view. I am successfully doing this, however, I am getting warnings/errors about my constraints. I am using auto layout via storyboard on this view and tried to disable/enable the constraints prior to/after showing/hiding the keyboard, but I am still getting these errors. Am I not disabling auto layout correctly? I followed what was given in this SO response.

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(sender: NSNotification) {
    self.pixieLabel.hidden = true
    self.searchBar.setTranslatesAutoresizingMaskIntoConstraints(true)
    self.startingTableView.setTranslatesAutoresizingMaskIntoConstraints(true)
    self.searchBar.frame.origin.y -= 150
    self.startingTableView.frame.origin.y -= 150
}
func keyboardWillHide(sender: NSNotification) {
    self.pixieLabel.hidden = false
    self.searchBar.setTranslatesAutoresizingMaskIntoConstraints(false)
    self.startingTableView.setTranslatesAutoresizingMaskIntoConstraints(false)
    self.searchBar.frame.origin.y += 150
    self.startingTableView.frame.origin.y += 150
}

func keyboardWillShow(sender: NSNotification) {
    self.pixieLabel.hidden = true
    self.seachBarTopConstraint.constant -= 150
    self.searchBar.layoutIfNeeded()
}
func keyboardWillHide(sender: NSNotification) {
    self.pixieLabel.hidden = false
    self.seachBarTopConstraint.constant += 150
    self.searchBar.layoutIfNeeded()
}

推荐答案

我认为您应该创建 @IBOutlet 对约束的引用，而不是调整 frame 值Interface Builder，然后在您想要为它们设置动画时更改这些约束的 constant 值，然后调用 layoutIfNeeded.据我了解，手动更改视图框架和自动布局的值不会混合使用.

Instead of adjusting theframe values, I think you should be creating @IBOutlet references to constraints in Interface Builder and then changing the constant value of those constraints when you want to animate them, followed by a call to layoutIfNeeded. As I understand it, manually changing the values of a view's frame and auto layout don't mix.

另外，我不会乱用 setTranslatesAutoresizingMaskIntoConstraints，除非您以编程方式添加约束，在这种情况下，您很可能只是将其设置为 false.

Also, I wouldn't mess around with setTranslatesAutoresizingMaskIntoConstraints unless you are adding your constraints programmatically, in which case you're most likely just setting it to false.

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