Warning: Attempt to present on whose view is not in the window hierarchy!
Posted
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了Warning: Attempt to present on whose view is not in the window hierarchy!相关的知识，希望对你有一定的参考价值。
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。
有时会遇到了此类警告:Warning: Attempt to present on whose view is not in the window hierarchy!
原因：页面跳转必须在viewDidLoad和viewDidAppear之后才能进行。
解决办法：必须确保页面跳转要在view load完毕之后进行。
第一种：通过延时来等待view Load执行结束，但是这个方法在时间上不好把握
第二种：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
以上是关于Warning: Attempt to present on whose view is not in the window hierarchy!的主要内容，如果未能解决你的问题，请参考以下文章
[!] Attempt to read non existent folder `***********`
***-[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from ob
attempt to create delete event with null entity
Opening socket connection to server :2181. Will not attempt to authenticate using SASL (unknown err
Java反射报错“Attempt to get int field “i“ with illegal data type conversion to short“