presentModalViewController什么都不做 [英] presentModalViewController does nothing

问题描述

我有一个UIViewController（ parent ）在<$ c上用另一个UIViewController（ child ）调用 presentModalViewController $ c> viewDidLoad 。

I have a UIViewController (parent) that calls presentModalViewController with another UIViewController (child) on viewDidLoad.

如果 parent 没有UINavigationController，那么 presentModalViewController 什么都不做。如果它有一个UINavigationController，则 presentModalViewController 按预期显示 child 。

If parent doesn't have a UINavigationController, then presentModalViewController does nothing. If it has a UINavigationController, then presentModalViewController shows child as expected.

这是 presentModalViewController的标准行为或者还有其他什么在玩吗？

Is this the standard behavior of presentModalViewController or is there something else at play here?

推荐答案

因为您要在 viewDidLoad 中展示它，请尝试在 viewDidAppear 中展示它。

It is because you are presenting it in viewDidLoad, try presenting it in viewDidAppear.

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