blocks|key|273491|text|您可以将约束保存到属性或变量，作为纵向和横向版本，然后在旋转时设置和删除它们。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|273492|我已经在xib中为初始视图设置了约束，并将它们分配给视图控制器中的出口。在旋转时，我创建替代约束，移除出口，但保留它们，插入替代。|273493|反向旋转时的过程。|273494|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

You can save your constraints, to a property or variable as portrait and landscape versions then set and remove them on rotate.

I have done this making my constraints in xib for initial view, assigning them to outlets in the view controller. On rotate I create the alternate restraints, remove the outlets but retain them, insert the alternates.

Reverse the process on rotate back.

blocks|key|273523|text|我遵循与您相同的方法(没有nib文件或故事板)。您必须更新updateViewConstraints方法中的约束(通过检查设备方向)。不需要在updateViewConstraints中调用setNeedsUpdateConstraints，因为只要更改设备方向，最后一个方法就会自动调用。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|273524|entityMap^0|T|L|1Z|L|2N|P|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|O|8|@]|D|@]|E|$]]]|G|$]]

I am following the same approach as yours (no nib files or storyboards). You have to update your constraints in <code>updateViewConstraints</code> method (by checking the device orientation). There is no need to call <code>setNeedsUpdateConstraints</code> in <code>updateViewConstraints</code> because as soon as you change the device orientation the last method is called automatically.

blocks|key|273577|text|对于正在搜索当前可能解决方案(Swift)的任何人，请在此UIViewController函数中更新您的约束：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|273578|+override+func+viewWillTransition(to+size:+CGSize,+with+coordinator:+UIViewControllerTransitionCoordinator)+{}|code-block|syntax|javascript|273579|每次设备旋转时都会调用此函数。它允许您响应这些更改，甚至为它们添加动画。为了给你更好的概述，这就是我在上一个项目中如何通过改变两个子视图的约束来改变我的布局。在纵向模式下，我的子视图在彼此之上，而在横向模式下，子视图并排显示。|273580|override+func+viewWillTransition(to+size:+CGSize,+with+coordinator:+UIViewControllerTransitionCoordinator)+{
++++//+1.+I+recommend+to+remove+existing+constraints+BEFORE+animation,+otherwise+Xcode+can+yell+at+you+"Unable+to+simultaneously+satisfy+constraints"
++++removeConstraintsOfSubview()

++++coordinator.animate(alongsideTransition:+{+[unowned+self]+context+in
++++++++//+2.+By+comparing+the+size,+you+can+know+whether+you+should+use+portrait+or+landscape+layout+and+according+to+that+remake+or+add+specific+constraints
++++++++if+size.height+>+size.width+{
++++++++++++self.setPortraitLayout()
++++++++}+else+{
++++++++++++self.setLandscapeLayout()
++++++++}
++++++++//+3.+If+you+want+the+change+to+be+smoothly+animated+call+this+block+here
++++++++UIView.animate(withDuration:+context.transitionDuration)+{
++++++++++++self.view.layoutIfNeeded()
++++++++}
++++++++},+completion:+{+_+in
++++++++++++//+After+the+device+is+rotated+and+new+constraints+are+added,+you+can+perform+some+last+touch+here+(probably+some+extra+animation)
++++})
}|273581|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

For anyone who is searching for current possible solution (Swift), update your constraints in this UIViewController function:

<pre><code> override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {}
</code></pre>

This is called everytime the device is rotated. It allows you to respond to these changes and even animate them.
To give you better overview, this is how I've changed my layout in my last project, by changing constraints of two subviews. In portrait mode I had subviews above each other, in landscape mode subviews were side by side.

<pre><code>override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
 // 1. I recommend to remove existing constraints BEFORE animation, otherwise Xcode can yell at you "Unable to simultaneously satisfy constraints"
 removeConstraintsOfSubview()

 coordinator.animate(alongsideTransition: { [unowned self] context in
 // 2. By comparing the size, you can know whether you should use portrait or landscape layout and according to that remake or add specific constraints
 if size.height &gt; size.width {
 self.setPortraitLayout()
 } else {
 self.setLandscapeLayout()
 }
 // 3. If you want the change to be smoothly animated call this block here
 UIView.animate(withDuration: context.transitionDuration) {
 self.view.layoutIfNeeded()
 }
 }, completion: { _ in
 // After the device is rotated and new constraints are added, you can perform some last touch here (probably some extra animation)
 })
}
</code></pre>

Is it possible to change the constraints when the device is rotated? How might this be achieved?

A simple example might be two images which, in portrait, are stacked one above the other, but in landscape are side-by-side.

If this is not possible, how else might I accomplish this layout?

I am constructing my views and constraints in code and not using interface builder.

Can I use autolayout to provide different constraints for landscape and portrait orientations?

Swift

Xcode

旋转设备时是否可以更改约束？如何才能做到这一点？一个简单的例子可能是两个图像，在肖像中，一个堆叠在另一个之上，但在风景中是并排的。如果这是不可能的，我还能如何完成这个布局呢？我在代码中构造我的视图和约束，而不是使用接口生成器。

问我可以使用自动布局来为横向和纵向提供不同的约束吗？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问我可以使用自动布局来为横向和纵向提供不同的约束吗？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问我可以使用自动布局来为横向和纵向提供不同的约束吗？
EN