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sizeThat在视图上有约束（框架布局视图中的自动布局视图）

[英]sizeThatFits on view with constraints (auto layout view inside frame layout view)

原文 2016-07-18 10:07:07 2 2 ios/ autolayout/ uikit

View A layouts it's subviews by calculating and setting their frames in layoutSubviews. 通过在layoutSubviews中计算和设置框架，查看A的子视图。

View B uses constraints to layout it's subviews. 视图B使用约束来布局它的子视图。

View A contains a number of View B instances. 视图A包含许多View B实例。

View A needs to know the size of its subviews when it layouts them, so it calls sizeThatFits: on them. 视图A在布局时需要知道子视图的大小，因此它会调用sizeThatFits: on。

View B's height depends on it's width. 视图B的高度取决于它的宽度。 In my example it has a multiline UILabel inside it. 在我的例子中，它内部有一个多行UILabel 。

How should B implement it's sizeThatFits: so it returns the correct size taking both the size parameter passed to sizeThatFits: and the constraints in account? B应该如何实现它的sizeThatFits:所以它返回正确的大小，同时将size参数传递给sizeThatFits:和帐户中的约束？

What I've tried/considered so far: 到目前为止我尝试/考虑的内容：

systemLayoutSizeFittingSize: - doesn't work because it doesn't take into account an exact size passed to it. systemLayoutSizeFittingSize: - 不起作用，因为它没有考虑传递给它的确切大小。 It can't be used to specify an exact width for eg a view that grows vertically as it shrinks horizontally. 它不能用于指定精确的宽度，例如，当水平收缩时垂直生长的视图。 It only gives either the most compressed size or the most expanded size. 它只提供最大压缩尺寸或最大尺寸。

intrinsicContentSize - this is used to pass information to Auto Layout as far as i understand from the docs. intrinsicContentSize - 据我所知，这可用于将信息传递给自动布局。 What we want is to get information from Auto Layout. 我们想要的是从 Auto Layout获取信息。

This is how i've reasoned so far. 到目前为止，这就是我的理由。 Please correct me if i've made a mistake. 如果我犯了错误，请纠正我。 And please help me, i'd be very grateful if someone could point me to how this is done! 请帮助我，如果有人能指出我是如何完成的，我将非常感激！

edit: Also, maybe there is some entirely different way to do this, without even using sizeThatFits: ? 编辑：此外，也许有一些完全不同的方式来做到这一点，甚至没有使用sizeThatFits: The only requirement i have is that i can continue using frame layout in the "outer" view (View A) and auto layout in the "inner view" (View B). 我唯一的要求是我可以在“外部”视图（视图A）中继续使用框架布局，在“内部视图”（视图B）中继续使用自动布局。

edit2: Added a picture to illustrate the exact case i must solve edit2：添加了一张图片来说明我必须解决的确切情况

edit3: Forgot to mention, i need to support iOS 7.0 edit3：忘了提，我需要支持iOS 7.0

2 个解决方案

From the picture it would appear that a UIStackView might be a better approach for View A? 从图中可以看出，UIStackView可能是View A的更好方法吗？

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIStackView_Class_Reference/ https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIStackView_Class_Reference/

and then just constrain with a margin offset the bottom of the View A UIStackView to the bottom of the last View B 然后用一个边距约束，将View A UIStackView的底部偏移到最后一个View B的底部

I would use Autolayout for the lot. 我会使用Autolayout。 You can still specify exact sizes and positions, you just do it with constraints instead of with frames. 您仍然可以指定精确的大小和位置，只需使用约束而不是框架。