viewDidLoad被调用两次 [英] viewDidLoad is called twice

问题描述

我的 viewDidLoad 被调用两次。一次通过 [UIViewController View] ，第二次通过 [UINib instanciateWithOwner：Options] 。为什么会这样？它可以被阻止吗？

My viewDidLoad in a view controller is called twice. Once by [UIViewController View] and a second time by [UINib instanciateWithOwner:Options]. Why is this happening? Can it be prevented?

谢谢

推荐答案

你放的任何代码在 viewDidLoad 里面应该可以多次运行而不会出现任何问题。如果您的代码只需要为您的控制器运行一次 -awakeFromNib 。原因是视图控制器的视图可以多次卸载和加载。 viewDidLoad 中的代码应该只修改UI以反映当前状态。

Any code you put inside of viewDidLoad should be able to run multiple times with out any issues. If you have code that only needs to run once for your controller use -awakeFromNib. The reason is because the view of the view controller can be unloaded and loaded multiple times. The code inside of viewDidLoad should only modify the UI to reflect the current state.

现在我已经知道了顺便说一句，你的特定问题看起来像是一个bug。请参阅 Ned的回答。

Now that I got that out of the way, your particular issue looks to be a bug. See Ned's answer.

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