viewWillDisappear和viewDidDisappear之间的巨大延迟 [英] Huge delay between viewWillDisappear and viewDidDisappear

问题描述

这是日志输出

2013-03-16 14:02:59.301 Echo[65406:4503] child viewWillDisappear start
2013-03-16 14:02:59.303 Echo[65406:4503] child viewWillDisappear returning
2013-03-16 14:02:59.303 Echo[65406:4503] parent viewWillAppear start
2013-03-16 14:02:59.305 Echo[65406:4503] parent viewWillAppear returning
2013-03-16 14:02:59.307 Echo[65406:4503] parent finished calling popToRootViewControllerAnimated on child.navigationController
2013-03-16 14:03:30.120 Echo[65406:c07] child viewDidDisappear start
2013-03-16 14:03:30.121 Echo[65406:c07] child viewDidDisappear returning
2013-03-16 14:03:30.121 Echo[65406:c07] parent viewDidAppear start
2013-03-16 14:03:30.122 Echo[65406:c07] parent viewDidAppear returning

viewWillDisappear 和 viewDidDisappear 。

推荐答案

这里的问题是线程。这是因为此操作是在AFNetworking代码的回调。而不是使用：

The problem here was threads. It is because this action was in a callback from AFNetworking code. Instead of using:

[controller.navigationController popViewControllerAnimated:NO];

需要：

// http://stackoverflow.com/questions/9411271/how-to-perform-uikit-call-on-mainthread-from-inside-a-block
dispatch_async(dispatch_get_main_queue(), ^{
    [controller.navigationController popViewControllerAnimated:NO];
    [self.navigationController pushViewController:newController animated:YES];
});

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