HidesBottomBarWhenPushed = NO not working?

Question

I have UITabBarin my application that I hide on the first UIViewControllerin the first tab, placing this line in ppDelegate :

// ... in MyAppDelegate.m
firstViewController.hidesBottomBarWhenPushed = YES;

The firstViewControlleruser can click UIButton, which clicks a new one UIViewControlleron the same tab. I would like it to UITabBardisplay again when this happens. I am trying to do it like this:

//... in firstViewController.m

secondViewController = [[SecondViewController alloc] init];
secondViewController.hidesBottomBarWhenPushed = NO;
[[self navigationController] pushViewController:secondViewController animated:YES];

Unfortunately, no returns UITabBar. He remains hidden.

How can I bring the panel UITabBarafter I hide it?

Thanks in advance.

Answer 1

, hidesBottomBarWhenPushed ( ):

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Answer 2

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- hidesBottomBarWhenPushed , , , :

Objective-C

- (BOOL) hidesBottomBarWhenPushed
{
    return (self.navigationController.topViewController == self);
}

Swift ( , , )

override var hidesBottomBarWhenPushed: Bool {
    get {
        return navigationController?.topViewController == self
    }
    set {
        super.hidesBottomBarWhenPushed = newValue
    }
}

hide/show , viewcontroller, .

Answer 3

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hidesBottomBarWhenPushed:

self.anotherViewController.hidesBottomBarWhenPushed = YES;
[self.navigationController pushViewController:self.anotherViewController animated:animated];

Answer 4

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:

UITabBarController 4 . UIViewController . IBOutlet, UIViewController, .

........

IBOutlet :

{
 self.hidesBottomBarWhenPushed = YES;
 /* Push the new controller with tab bar */
}

UITabBarController's, , .

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........

viewWillDisappear UIViewController, UIViewController :

- (void) viewWillDisappear:(BOOL)animated
{
    self.hidesBottomBarWhenPushed = NO;
}

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Answer 5

, hidesBottomBarWhenPushed. , , .

, :

SecondViewController YES, firstViewController NO.

Answer 6

secondViewController.hidesBottomBarWhenPushed = NO;

firstViewController.hidesBottomBarWhenPushed = YES;

Answer 7

UINavigationController. , , , .

ivar UINavigationController:

@interface CustomNavigationController ()
{
    NSMutableSet *_viewControllersWithHiddenBottomBar;
}

@end

push pop, :

- (void) pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if(viewController.hidesBottomBarWhenPushed)
    {
        viewController.hidesBottomBarWhenPushed = NO;
        [_viewControllersWithHiddenBottomBar addObject:viewController];
        [self rootViewController].hidesBottomBarWhenPushed = YES;
    }
    else
    {
        [self rootViewController].hidesBottomBarWhenPushed = NO;
    }
    [super pushViewController:viewController animated:animated];
}

- (UIViewController *) popViewControllerAnimated:(BOOL)animated
{
    if([_viewControllersWithHiddenBottomBar containsObject:self.viewControllers[self.viewControllers.count - 2]])
    {
        [self rootViewController].hidesBottomBarWhenPushed = YES;
    }
    else
    {
        [self rootViewController].hidesBottomBarWhenPushed = NO;
    }
    UIViewController *poppedViewController = [super popViewControllerAnimated:animated];
    [_viewControllersWithHiddenBottomBar removeObject:poppedViewController];
    return poppedViewController;
}

- (UIViewController *) rootViewController
{
    return ((UIViewController *)self.viewControllers.firstObject);
}

hidesButtomBarWhenPushed , reset viewcontroller (, , ). , root viewcontroller .

-, initWithRootViewController:.

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Answer 8

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#define kTabBarHeight               49 // This may be different on retina screens. Frankly, I have not yet tried.

- (void) hideTabBar:(BOOL)hide {

    // fetch the app delegate
    AppDelegate         *delegate   = [[UIApplication sharedApplication] delegate];

    // get the device coordinates
    CGRect              bounds      = [UIScreen mainScreen].bounds;
    float               width;
    float               height;

    // Apparently the tab bar controller view works with device coordinates  
    // and not with normal view/sub view coordinates
    // Therefore the following statement works for all orientations. 
    width                   = bounds.size.width;
    height                  = bounds.size.height;

    if (hide) {

        // The tab bar should be hidden too. 
        // Otherwise it may flickr up a moment upon rotation or 
        // upon return from detail view controllers. 
        [self.tabBarController.tabBar setHidden:YES];

        // Hiding alone is not sufficient. Hiding alone would leave us with an unusable black
        // bar on the bottom of the size of the tab bar. 
        // We need to enlarge the tab bar controller view by the height of the tab bar. 
        // Doing so the tab bar, although hidden, appears just beneath the screen. 
        // As the tab bar controller view works in device coordinations, we need to enlarge 
        // it by the tab bar height in the appropriate direction (height in portrait and width in landscape)
        // and in reverse/upside down orientation we need to shift the area origin beyond zero. 
        switch (delegate.tabBarController.interfaceOrientation) {
            case UIInterfaceOrientationPortrait:
                // Easy going. Just add the space on the bottom.
                [self.tabBarController.view setFrame:CGRectMake(0,0,width,height+kTabBarHeight)];
                break;

            case UIInterfaceOrientationPortraitUpsideDown:
                // The bottom is now up! Add the appropriate space and shift the rect origin to y = -49
                [self.tabBarController.view setFrame:CGRectMake(0,-kTabBarHeight,width,height+kTabBarHeight)];
                break;

            case UIInterfaceOrientationLandscapeLeft:
                // Same as Portrait but add the space to the with but the height
                [self.tabBarController.view setFrame:CGRectMake(0,0,width+kTabBarHeight,height)];
                break;

            case UIInterfaceOrientationLandscapeRight:
                // Similar to Upside Down: Add the space and shift the rect. Just use x and with this time
                [self.tabBarController.view setFrame:CGRectMake(0-kTabBarHeight,0,width+kTabBarHeight,height)];
                break;

            default:
                break;
        }
    } else {
        // reset everything to its original state. 
        [self.tabBarController.view setFrame:CGRectMake(0,0,width,height)];
        [self.tabBarController.tabBar setHidden:NO];
    }

    return; 
}


- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{

    // It is important to call this method at all and to call it here and not in willRotateToInterfaceOrientation
    // Otherwise the tab bar will re-appear. 
    [self hideTabBar:YES];

    // You may want to re-arrange any other views according to the new orientation
    // You could, of course, utilize willRotateToInterfaceOrientation instead for your subViews. 
}

- (void)viewWillAppear: (BOOL)animated { 

    // In my app I want to hide the status bar and navigation bar too. 
    // You may not want to do that. If so then skip the next two lines. 
    self.navigationController.navigationBar.barStyle = UIBarStyleBlackTranslucent;
    [[UIApplication sharedApplication] setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];

    [self hideTabBar: YES];

    // You may want to re-arrange your subviews here. 
    // Orientation may have changed while detail view controllers were visible. 
    // This method is called upon return from pushed and pulled view controllers.   

    return;
}

- (void)viewWillDisappear: (BOOL)animated {     

    // This method is called while this view controller is pulled
    // or when a sub view controller is pushed and becomes visible
    // Therefore the original settings for the tab bar, navigation bar and status bar need to be re-instated

    [self hideTabBar:NO];

    // If you did not change the appearance of the navigation and status bar in viewWillAppear,
    // then you can skip the next two statements too. 
    self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
    [[UIApplication sharedApplication] setStatusBarHidden:NO withAnimation:UIStatusBarAnimationSlide];

    return;
}

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I will keep you posted as soon as I find solutions to these small but unpleasant mistakes.