今天因为要弄一个瀑布流里面item的动态加载,
所以考虑把里面的一些空间的高度设成0从而实现“隐藏”效果
网上对这类修改是 关联 NSLayoutConstraint
然后设置对应的constant
下面是网上的答案,但是注意了,要用父类layoutIfNeeded()来重新布局
If you are adding constraint programatically like this:
Then you can update it this way:
And if you want that with animation you can do it this way:
|
If you are adding constraint programatically like this:
Then you can update it this way:
And if you want that with animation you can do it this way:
|
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