blocks|key|1464149|text|在所有决议中都支持同样的行为。您需要按以下方式设置布局。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1464150|红景城|offset|length|style|BOLD|1464151|📷|atomic|1464152|​|1464153|UIView顶级|1464154|1464155|1464156|1464157|UIView中间|1464158|1464159|1464160|1464161|UIView底部|1464162|1464163|1464164|1464165|希望这能帮到你。|1464166|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/ae9cf69c729f67f7aee2b659c9e857ff.png|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/3a183c39f78ae7663619f0b700d19b8e.png|2|https://developer.qcloudimg.com/http-save/yehe-900000/6a5f74cbb746976eac717a218cc597f0.png|3|https://developer.qcloudimg.com/http-save/yehe-900000/80b4b5a7a84126c7ce32b22b7ba858ff.png^0|0|0|3|0|0|1|0|0|0|0|8|0|0|0|1|1|0|0|0|8|0|0|0|1|2|0|0|0|8|0|0|0|1|3|0|0|0^^$0|@$1|2|3|4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1J|8|@$D|1K|E|1L|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|1M|8|@]|9|@$D|1N|E|1O|1|1P]]|A|$]]|$1|K|3|L|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1R|8|@$D|1S|E|1T|F|G]]|9|@]|A|$]]|$1|O|3|L|5|6|7|1U|8|@]|9|@]|A|$]]|$1|P|3|I|5|J|7|1V|8|@]|9|@$D|1W|E|1X|1|1Y]]|A|$]]|$1|Q|3|L|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|R|3|S|5|6|7|20|8|@$D|21|E|22|F|G]]|9|@]|A|$]]|$1|T|3|L|5|6|7|23|8|@]|9|@]|A|$]]|$1|U|3|I|5|J|7|24|8|@]|9|@$D|25|E|26|1|27]]|A|$]]|$1|V|3|L|5|6|7|28|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|29|8|@$D|2A|E|2B|F|G]]|9|@]|A|$]]|$1|Y|3|L|5|6|7|2C|8|@]|9|@]|A|$]]|$1|Z|3|I|5|J|7|2D|8|@]|9|@$D|2E|E|2F|1|2G]]|A|$]]|$1|10|3|L|5|6|7|2H|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|2I|8|@]|9|@]|A|$]]|$1|13|3|-4|5|6|7|2J|8|@]|9|@]|A|$]]]|14|$15|$5|16|17|18|A|$19|1A|1B|-4]]|1C|$5|16|17|18|A|$19|1D|1B|-4]]|1E|$5|16|17|18|A|$19|1F|1B|-4]]|1G|$5|16|17|18|A|$19|1H|1B|-4]]]]

To support same behaviour in all resolution. you need to set layout as follow.

Red View
<img src="https://i.stack.imgur.com/PL5hL.png" alt="enter image description here">

UIView Top

<img src="https://i.stack.imgur.com/gQLYk.png" alt="enter image description here">

UIView Middle

<img src="https://i.stack.imgur.com/PFDbK.png" alt="enter image description here">

UIView Bottom

<img src="https://i.stack.imgur.com/lXKZI.png" alt="enter image description here">

hope this help you.

blocks|key|962005|text|您可以从第三个视图中添加一个底部约束到其superview中，然后必须删除superview的固定高度约束。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|962006|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can add a bottom constraint from the 3rd view to its superview, then you have to remove the fixed height constraint of the superview.

I have a UIView with 3 UIViews as its subviews. I have set layout constraints for these subview as fixed aspect ratio. i.e if the screen size changes their width will change but aspect ratio will always be the same.

Now i have also made width of the UIView (the red one as shown in screen shot) changing as the screen size changes. 
But i am struggling to make constraint for height of this view. what i want is its height should be set according to the total height of the subviews inside it.

since the height of the subviews will change if the width of the screen changes, because i have made their aspect ratios fixed.

As of right now i have made height of the Red superview fixed.
but i want it to be variable according the total height of all the subviews inside it.

Here is the screen shot of my viewcontroller and its preview.

<img src="https://i.stack.imgur.com/iJTZE.png" alt="enter image description here"> 

As you can see there is some space remaining because of the fixed height of red super view.

Details of the constraints i have added so far are as bellow.

Main Red SuperView

<img src="https://i.stack.imgur.com/kGasM.png" alt="Main Red SuperView">

**1st (Top), 2nd (Middle), 3rd (Bottom) Subviews respectively **

<img src="https://i.stack.imgur.com/9mDYZ.png" alt="enter image description here">

How to set layout constraints for variable hight calculated at run time?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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问如何为运行时计算的变量高度设置布局约束？
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