ios - 当主视图是 UIScrollView 但不是 UIView 时隐藏导航栏调整视图大小

Question

当用户点击屏幕时，我试图隐藏状态栏和导航栏。这很好用，但是当导航栏和状态栏出现并从屏幕上消失时，它总是会调整“视图”的大小。因此，我认为 setWantsFullScreenLayout:YES 不起作用。这里是代码的摘录：

- (void)loadView
{   
    // Make transparencies of bars and full screen
    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent];
    [self.navigationController.navigationBar setBarStyle:UIBarStyleBlackTranslucent]; 
    [self setWantsFullScreenLayout:YES];       

    pagingScrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    /* ... */

    // Assign to UIScrollView !!
    self.view = pagingScrollView;
}

但是，如果我将 self.view 分配给 UIView 而不是 UIScrollView，那么当导航栏和状态栏出现并从屏幕上消失时，永远不会调整视图的大小

- (void)loadView
{   
    // Make transparencies of bars and full screen
    [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleBlackTranslucent];
    [self.navigationController.navigationBar setBarStyle:UIBarStyleBlackTranslucent]; 
    [self setWantsFullScreenLayout:YES];       

    pagingScrollView = [[UIScrollView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    /* ... */

    // Assign to UIView !!
    UIView * mainView  = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    [mainView addSubview:pagingScrollView];
    self.view = mainView;
}

所以我的问题是¿这里是否有一些逻辑来调整视图的大小？

提前致谢。