问题描述
我不能找到一种方法来创建一个广场的约束，这意味着在Interface Builder的宽度等于高度。我想这是可能的编程方式添加这样的限制。有什么我可以做IB？也许我只是没有看到呢？这似乎微不足道，但我找不到它。
I can't find a way to create a 'square' constraint, meaning 'width equals height' in Interface Builder. I guess it's possible to add such constraint programmatically. Is there something I can do in IB? Maybe I just don't see it? It seems trivial, yet I can't find it.
推荐答案
更新X $ C $ç5.1b5
按Ctrl +从视图中单击并拖动和释放，而指针所在的视图。选择宽高比。其中第一和第二项是视图它会创建一个约束
Ctrl+click and drag from a view and release while the pointer is over the view. Select "Aspect Ratio". It will create a constraint where the first and second item is the view.
X $ C $在C之前5.1
您不能因为宽度/高度编辑缺乏领域涉及到另一个属性或设置比：
You can't because the width/height editor lacks the fields to relate to another property or set the ratio:
因此，你不能EX preSS在Interface Builder以下code：
Therefore, you can't express the following code in Interface Builder:
CGFloat ratio = 1.0;
NSLayoutConstraint *constraint = [NSLayoutConstraint
constraintWithItem:myView
attribute:NSLayoutAttributeWidth
relatedBy:NSLayoutRelationEqual
toItem:myView
attribute:NSLayoutAttributeHeight
multiplier:ratio
constant:0];
constraint.priority = 1000;
[myView.superview addConstraint:constraint];
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