iOS-隐藏状态栏

iOS系统隐藏状态栏。

在plist里设置：
首先设置key：

Status bar is initially hidden = YES

然后设置key：

View controller-based status bar appearance = NO

ViewController:

if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
    // iOS 7
    self.isStatusBarVisible = YES;
    [self prefersStatusBarHidden];
    [self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];
}

- (BOOL)prefersStatusBarHidden
{
    return !self.isStatusBarVisible;
}