ios 隐藏状态栏，时间

  if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
        // iOS 7
        [self prefersStatusBarHidden];
        [self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];
    }
- (BOOL)prefersStatusBarHidden
{
    return YES;//隐藏为YES，显示为NO

}

或者设置plist文件全局

设置key：Status bar is initially hidden    YES

设置key：View controller-based status bar appearance   NO