如何从代码中更改长宽比约束值? [英] How can I change the aspect ratio constraint value from code?

问题描述

我在xib中为imageView给出了1:2的宽高比约束.我已经为约束创建了一个IBOutlet.现在，我需要将某些标准的宽高比更改为1:1.我想知道除了删除旧约束并放入新约束之外，是否还有其他方法可以更改约束的乘数?

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??

推荐答案

乘数是仅获取属性.因此，您只能更改常量和isActive.

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

此约束的常数会更改高度.如果常数==宽度，那么高度将为零.

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

最好添加高度和宽度约束并在代码中进行更改.

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

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