Correct method to setup iOS constriants

Question

I just started using constraints in iOS. I feel fairly comfortable with them, but now I'm wondering what's the proper way to create them. I remember reading to create the constraints in a view's updateConstraints method. But I see that doing so could lead to adding multiple copies of the same constraints. Is this true, or will an exact duplicate constraint not be added?

Should my constraints be added in the init and just updated in the updateConstraints or is it okay to add and update the constraints in the updateConstraints method?

Answer 1

根据Dave的评论，答案是在init创建初始约束。