启动时无法隐藏状态栏

我正在构建一个iOS 9带有horizontal页面导航的应用程序,需要在某些页面上显示状态栏,并将其隐藏在其他页面上.我想使用淡入/淡出动画,所以我必须设置

View controller-based status bar appearance = NO

并像这样更新状态栏:

[[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];

在页面之间导航时,此过程非常有效,但我无法在启动时删除状态栏.

我试过设置: Status bar is initially hidden = YES

将此添加到 NavigationControllers viewDidLoad:

[[UIApplication sharedApplication] setStatusBarHidden:YES];
self.statusBarHidden = YES;
[self setNeedsStatusBarAppearanceUpdate];

将此添加到AppDelegates didFinishLaunchingWithOptions:

application.statusBarHidden = YES;

将其添加到初始页面的ViewController:

- (BOOL)prefersStatusBarHidden {
    return YES;
}

检查General-> Deployment Info中的"隐藏状态栏"选项

并在链接的storyboard元素中将"状态栏"设置为"无"

但状态栏仍然在发布时出现.如何在不改变值的情况下摆脱启动时的状态栏View controller-based status bar appearance？