问题
I am just pushing new VC like this.
[nav pushViewController:vc animated:YES];
However, it doesn't push. The new view reach the state - viewwillappear but viewDidAppear fail to reach sometime. I can swipe back to go back. I have checked new view frame and it is also normal.
View frame is {{0, 64}, {320, 455}}. May I know where bug can occur?
回答1:
Please check if your UIViewController is pushed or presented. If it is pushed then you can push a new UIViewController then you can push new view controller if it is presented then you can not push.
来源：https://stackoverflow.com/questions/29094230/pushviewcontroller-stuck-or-viewdidappear-fail