对Warning: Attempt to present XXX on XXX whose view is not in the window hierarchy!的解决方案

下面是我找到的最靠谱的答案了。尝试后问题果然解决了。分享给大家。http://blog.csdn.net/sbvfhp/article/details/19826221

当我想从一个VC跳转到另一个VC的时候，

一般会用- (void)presentViewController:(UIViewController *)viewControllerToPresent animated: (BOOL)flag completion:(void (^)(void))completion;当然也可以用导航push。

可是昨天就遇到了题目中的warning，在stackoverflow找到了答案：点击打开链接

大意就是页面跳转必须在viewDidLoad和viewDidAppear之后才能进行。解决的办法就是确保页面跳转要在view load完毕之后进行。大神说可以通过设置延时来实现，通过实验我觉得这个不好控制，到底需要延时多少呢？

后来换了一个方案，在viewDidLoad里用

[selfperformSelectorOnMainThread:@selector(login)withObject:nilwaitUntilDone:NO];

把页面跳转的代码写进函数里，然后将 waitUntilDone 设为NO，就是viewDidLoad直接返回不用等login执行。这样就可以确保login里的页面跳转是在viewDidLoad之后执行。

时间： 2024-08-27 12:11:58

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