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dismissViewControllerAnimated:completion:未执行

当我调用dismissViewControllerAnimated:completion:dismiss UIViewController时,当相应的视图正在动画到屏幕上时(使用presentViewController:animated:completion:),从不执行完成块.

该UIViewController甚至不dissappear.这就像dismissViewControllerAnimated:completion:被忽略了.

以下代码是一个简化的代码示例,因为原始代码要大得多.我在下面给出的代码模拟了一个用例,其中网络通信错误可能触发视图弹出,而另一个视图也同时弹出.

代码示例:

NSLog(@"Presenting view");

[self presentViewController:changeLocationViewController animated:YES completion:^{
    NSLog(@"View done presenting");
}];

NSLog(@"Dismissing view");

[self dismissViewControllerAnimated:NO completion:^{
    NSLog(@"View done dismissing");
}];

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