假设我有一个 UIView,其中包含一个必须为 4:3 的子 UIView.我想在代码中使用 AutoLayout 来解决这个问题.
Let's say I have a UIView that contains a child UIView which has to be 4:3. I want to solve this problem using AutoLayout in code.
我一直在努力使用 AutoLayout,但我还没有弄清楚如何做到这一点.
I've been struggling with AutoLayout but I haven't figured out yet how to do this.
你知道如何解决这个问题吗?
Do you know how to solve this problem?
非常感谢.
我附上一张图片来更好地解释我的意思.http://d.pr/i/d0Oc
I attach an image to explain better what I mean. http://d.pr/i/d0Oc
我想通了.
//Given a childView...
NSLayoutConstraint *constraint =[NSLayoutConstraint
constraintWithItem:childView
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:childView
attribute:NSLayoutAttributeHeight
multiplier:4.0/3.0 //Aspect ratio: 4*height = 3*width
constant:0.0f];
[childView addConstraint:constraint];
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