如何以编程方式禁用约束？ [英] How to disable a constraint programmatically?

问题描述

如何以编程方式禁用约束？

How to disable a constraint programmatically?

我有两个约束，一个约束的优先级取决于另一个约束。据我所知，约束优先级在安装时无法以编程方式更改（这会引发错误），所以想法是，当X发生时，约束A禁用，约束B启用，当Y发生A是启用，而B禁用

I have two constraints, that the priority of one depends for the other. As far as I know the constraints priority can’t change programmatically when they are installed (it throw me an error), So the idea is, when X occurs the constraint A is disable and the constraint B is enable, and when Y occur A is enable and B disable

IBOutlet weak var constraint_A
IBOutlet weak var constraint_B

... 

func configureViews() {
   if x {
        constraint_A.disable = true
        constraint_B.disable = false
   }  else {
        constraint_A.disable = false
        constraint_B.disable = true
   }
}
...

推荐答案

约束有一个名为 active 的布尔属性，因此如果要禁用约束您可以轻松地调用它：

The constraints have a boolean property called active so if you want to disable a constraint you can easily call it:

constraint_A.active = false

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