如何从代码中更改宽高比约束值？

Question

I have given an aspect ratio constraint of 1:2 for an imageView in my xib. I have created an IBOutlet for the constraint. Now I need to change the aspect ratio to 1:1 for certain criteria. I want to know whether there is any way to change the constraint's multiplier value other than removing the old constraint and putting in a new one??

Answer 1

我认为除了'删除和替换约束'方法之外，它是不可能的。

Answer 2

The multiplier is a get only property. So you can change only constant and isActive.

The constant for this constraint changes the height. If constant == width, then the height would be zero.

It's better to add height and width constraints and change them in code.