移动自动布局约束一个文本框的键盘出现时 [英] Moving a textfield with auto layout constraints when the keyboard appears

问题描述

我有一个搜索栏的文本字段和表视图（谷歌自动完成），我想翻译起来的时候键盘映入眼帘。我成功地这样做，但我得到了我的约束警告/错误。我对这种观点通过故事板使用自动布局，并试图禁用/启用前/后显示/隐藏键盘的限制，但我仍然得到这些错误。我不能正确禁用自动布局？我跟着什么是在<一个给定的href=\"http://stackoverflow.com/questions/11368440/can-i-disable-autolayout-for-a-specific-subview-at-runtime\">this SO回应。

 覆盖FUNC viewDidLoad中（）{
    ...
    。NSNotificationCenter.defaultCenter（）的addObserver（自我，选择：选择（keyboardWillShow），名称：UIKeyboardWillShowNotification，对象：无）
    。NSNotificationCenter.defaultCenter（）的addObserver（自我，选择：选择（keyboardWillHide），名称：UIKeyboardWillHideNotification，对象：无）
    ...
}
FUNC keyboardWillShow（发件人：NSNotification）{
    self.pixieLabel.hidden =真
    self.searchBar.setTranslatesAutoresizingMaskIntoConstraints（真）
    self.startingTableView.setTranslatesAutoresizingMaskIntoConstraints（真）
    self.searchBar.frame.origin.y  -  = 150
    self.startingTableView.frame.origin.y  -  = 150
}
FUNC keyboardWillHide（发件人：NSNotification）{
    self.pixieLabel.hidden = FALSE
    self.searchBar.setTranslatesAutoresizingMaskIntoConstraints（假）
    self.startingTableView.setTranslatesAutoresizingMaskIntoConstraints（假）
    self.searchBar.frame.origin.y + = 150
    self.startingTableView.frame.origin.y + = 150
}
 

解决方案code

  FUNC keyboardWillShow（发件人：NSNotification）{
    self.pixieLabel.hidden =真
    self.seachBarTopConstraint.constant  -  = 150
    self.searchBar.layoutIfNeeded（）
}
FUNC keyboardWillHide（发件人：NSNotification）{
    self.pixieLabel.hidden = FALSE
    self.seachBarTopConstraint.constant + = 150
    self.searchBar.layoutIfNeeded（）
}
 

解决方案

除了调整架值

，我想你应该创建 @ IBOutlet中，并在Interface Builder约束参考文献，然后改变这些约束的恒值当你想制作动画，随后调用 layoutIfNeeded 。据我了解，手动更改视图的框架和经销商布局的值不混合。

另外，我也不会用 setTranslatesAutoresizingMaskIntoConstraints 除非你是编程方式将您的约束，在这种情况下，你很可能只是将其设置为<$ C $浪费时间C>假。

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
}

Solution Code

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()
}

解决方案

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.

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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