status bar 半透明

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
        self.wantsFullScreenLayout = YES;
    }
    return self;
}

    [[UIApplication sharedApplication] setStatusBarHidden:hideEnable withAnimation:UIStatusBarStyleBlackTranslucent];