View controller-based status bar appearance

info.plist文件中，View controller-based status bar appearance项设为YES，则View controller对status bar的设置优先级高于application的设置。为NO则以application的设置为准，view controller的prefersStatusBarHidden方法无效，是根本不会被调用的。

一、如果View controller-based status bar appearance 设为YES。
这时 view controller中对status bar的设置优先级高于application的设置，用下面的方式隐藏status bar:

1、在view controller中调用setNeedsStatusBarAppearanceUpdate，更新status bar的显示。

- (void)viewDidAppear:(BOOL)animated
{[super viewDidAppear:animated];if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {[self prefersStatusBarHidden];[self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];}
}

2、覆盖view controller的prefersStatusBarHidden的实现，返会YES。

- (BOOL)prefersStatusBarHidden
{return YES;
}

二、如果View controller-based status bar appearance 设为NO,这时application的设置优先级最高，用下面的方式隐藏status bar:

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:NO];

综合上面的结论，如果iOS6和iOS7都支持，则处理方式如下：

一、如果View controller-based status bar appearance 设为NO。

则在iOS6和iOS7都是用下面的方法隐藏status bar。

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:NO];

二、如果View controller-based status bar appearance 设为YES。

则需要判断当前是iOS6还是iOS7。如果是iOS6，则还通过sharedApplication隐藏。

如果是iOS7，则用setNeedsStatusBarAppearanceUpdate加prefersStatusBarHidden的方式来隐藏 status bar。

取info.plist中 View controller-based status bar appearance中的设置：

NSNumber *isVCBasedStatusBarAppearanceNum = [[NSBundle mainBundle]objectForInfoDictionaryKey:@"UIViewControllerBasedStatusBarAppearance"];
if (isVCBasedStatusBarAppearanceNum) {_isVCBasedStatusBarAppearance = isVCBasedStatusBarAppearanceNum.boolValue;
} else {_isVCBasedStatusBarAppearance = YES; // default
}

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