Attempt to present on whose view is not in the window hierarchy!

在开发的时候，有时候会遇到

1.ios attempt to present whose view is not in the window hierarchy

2.Warning: Attempt to present on whose view is not in the window hierarchy!

等等这样类似的提示，只要里面提示有 window hierarchy，都是view hierarchy的理解不到位导致的。

上面的问题都是在一个controller的view还没加到window上的时候又取present另外一个controller，这就相当于在盖楼，2楼还没盖完，直接去盖3楼了，这样肯定是不行。

遇到上面的问题最直接的解决方法就是在controller的viewDidAppear里面去调用present。这样可以确保view hierarchy的层次结构不乱。

时间： 2024-11-07 18:01:49

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