Apparently, in addition to setting the status bar to not be hidden, you also have to reset its style
after the camera view makes it disappear. Try this:
[[UIApplication sharedApplication] setStatusBarHidden:NO animated:NO];
[[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent animated:YES];
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原文地址：http://blog.csdn.net/liudukun/article/details/47137751
