如何使用autolayout获得真正大小的UIView-HowtogetrealsizeUIViewwithautolayout

13  

The simplest solution is to just run that code in -viewDidAppear: (after autolayout has been run).

最简单的解决方案是在-viewDidAppear中运行该代码:(在运行autolayout之后）。

38  

Before your "getting real size code", insert the following code:

在“获取实际大小代码”之前，请插入以下代码：

[view setNeedsLayout];
[view layoutIfNeeded];

14  

Since everybody assumes the access is done via a UIViewController and not inside a UIView subclass, the answers don't prove really useful. The correct way to get the correct size of a UIView subclass is in layoutSubviews.

由于每个人都认为访问是通过UIViewController完成的，而不是在UIView子类中，因此答案并不真正有用。获取UIView子类的正确大小的正确方法是在layoutSubviews中。

9  

You could just use the UIView method intrinsicContentSize

您可以使用UIView方法intrinsicContentSize

which you can read about https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instm/UIView/intrinsicContentSize

您可以阅读有关https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIView_Class/#//apple_ref/occ/instm/UIView/intrinsicContentSize的内容

6  

This is awesome.

这太棒了。

If you want to get frame without using layoutsubviews method during autolayout usage, Use this one:

如果您想在自动布局使用期间不使用layoutsubviews方法获取帧，请使用以下方法：

dispatch_async(dispatch_get_main_queue(), ^{
        NSLog(@"View frame: %@", NSStringFromCGRect(view.frame));
    })

3  

Seems like - (CGSize)systemLayoutSizeFittingSize:(CGSize)targetSize; is what you are looking for:

好像 - （CGSize）systemLayoutSizeFittingSize：（CGSize）targetSize;是你在找什么：

Return Value
The size of the view that satisfies the constraints it holds.

返回值满足其所拥有约束的视图大小。

Discussion
Determines the best size of the view considering all constraints it holds and those of its subviews.

讨论确定视图的最佳大小，考虑它所拥有的所有约束及其子视图的约束。

https://developer.apple.com/documentation/uikit/uiview/1622624-systemlayoutsizefittingsize?language=objc

https://developer.apple.com/documentation/uikit/uiview/1622624-systemlayoutsizefittingsize?language=objc

1  

The best moment is during the viewDidLayoutSubviews because it happens before the viewDidAppearso you still are able to do some modifications before the view is displayed.

最佳时刻是在viewDidLayoutSubviews期间，因为它发生在viewDidAppearso之前，您仍然可以在显示视图之前进行一些修改。

0  

[view layoutIfNeed] save me.

[查看layoutIfNeed]救救我。

Use this method to force the layout of subviews before drawing. Using the view that receives the message as the root view, this method lays out the view subtree starting at the root.

使用此方法在绘制之前强制子视图的布局。使用以根视图接收消息的视图，此方法从根开始布局视图子树。

After invoke this method, I can get actual size of custom view in xib. Thanks a lot to @Allen and the author.

调用此方法后，我可以在xib中获得自定义视图的实际大小。非常感谢@Allen和作者。