hiding TabBar when rotating iPhone device to lands

问题:

So here is what i have: A UITabBarController that handles different UIViewControllers. In one of the UIViewController i am trying to switch the view being displayed when the device rotates to landscape. the important part is that the view displayed in landscape MUST take the whole screen...

I have correctly implemented the methods :

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation

In fact i do have my rotation occurring correctly, and I my views swaped. i even hide status bar, nav bar and Tab bar BUT i keep having a blank space at the bottom of the screen which is the place of the TabBar...

So i am assuming that setting the hidden property of the tabBar is not enough in order to have the view on the whole screen. I think there is some stuff to do within the TabBarController or even the MainWindow to say somehting like "i don't need TabBarController now". But i do not see how to get around this problem properly.

If anyone has been around this issue, i would appreciate some help.

thank you, Sami.

回答1:

This worked for me.

- (void)viewDidLoad {
    [super viewDidLoad];    
    previousRect = self.view.frame; 
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;
{
    if(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {       
        [self.navigationController setNavigationBarHidden:TRUE animated:FALSE]; 
        [[UIApplication sharedApplication] setStatusBarHidden:TRUE animated:FALSE];
    }
    else
    {
        [self.navigationController setNavigationBarHidden:FALSE animated:FALSE];
        [[UIApplication sharedApplication] setStatusBarHidden:FALSE animated:FALSE];
    }
}

-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation { 
    UIInterfaceOrientation toOrientation = self.interfaceOrientation;

    if ( self.tabBarController.view.subviews.count >= 2 )
    {
        UIView *transView = [self.tabBarController.view.subviews objectAtIndex:0];
        UIView *tabBar = [self.tabBarController.view.subviews objectAtIndex:1];

        if(toOrientation == UIInterfaceOrientationLandscapeLeft || toOrientation == UIInterfaceOrientationLandscapeRight) {                 
            transView.frame = CGRectMake(0, 0, 480, 320 );
            tabBar.hidden = TRUE;
        }
        else
        {               
            transView.frame = previousRect;     
            tabBar.hidden = FALSE;
        }
    }
}

回答2:

• The solution above worked for me too just some little changes for iOS6 and above:
• in iOS6 remove the line: " previousRect = self.view.frame; "
• also replace " animated: " with " withAnimation: "
• and remove " transView.frame = previousRect; " from the bottom (in else function)
• It works for me this way. And a big thanks to user UB.

回答3:

This code works fine but when i dismiss a uiviewcontroller which is presented modally, my view is under the status bar by 20 pixel. My view is inside a navigationcontroller so i do not hide it before rotation.

回答4:

I needed tab bar to go into full screen mode in landscape view and I tried the approach suggested above using

transView.frame = CGRectMake(0, 0, 480, 320 );

This turned out to be a hacky solution and posed many problems such as with hiding and re-displaying the status bar (the view would overlap with the status bar when it is re-displayed after exiting portrait view). I would not recommend this. What worked for me perfectly in the end was pushing a new view controller containing the landscape view and using delegation to reuse the functionality of the original VC.

回答5:

This approach is working for me:

- (void) willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {

    UIView *parentView = self.tabBarController.view;
    CGRect frame = parentView.frame;
    CGFloat windowHeight = parentView.window.frame.size.height;

    switch (toInterfaceOrientation) {
        case UIInterfaceOrientationLandscapeLeft:
        case UIInterfaceOrientationLandscapeRight:
            CGFloat tabBarHeight = self.tabBarController.tabBar.frame.size.height;
            frame.size.height = windowHeight + tabBarHeight;
            break;
        default:
            frame.size.height = windowHeight;
            break;
    }

    [UIView animateWithDuration:duration animations:^{
        parentView.frame = frame;
    }];
}

(Only tested in iOS8.)

回答6:

Subclass your TabBarController and hide the TabBar when needed:

class tabBarVC: UITabBarController {

    override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
        if size.height < size.width {
            self.tabBar.hidden = true
        } else {
            self.tabBar.hidden = false
        }
    }

}

回答7:

Maybe you want to use this

- (void)willAnimateRotationToInterfaceOrientation:UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    [super willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];

    __block UIView *weakTabBar = [self.tabBarController.view.subviews objectAtIndex:1];
    weakTabBar.alpha = 0;
    [UIView animateWithDuration:duration
                          delay:0
                        options:UIViewAnimationOptionCurveEaseIn // slow at the beggining
                     animations:^{
                         weakTabBar.alpha = 1;
                     }
                     completion:^(BOOL finished) {
                         weakTabBar.alpha = 1;
                     }];
    }

}

This doesn't hide the tab bar but makes the rotate animation smoother.

回答8:

If you have your UITabBarController then put a UINavigationController inside it then you can use hidesBottomBarWhenPushed (with a bit of trickery) to do this.

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    [super willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];

    if (toInterfaceOrientation == UIInterfaceOrientationPortrait) {
        self.hidesBottomBarWhenPushed = NO;
        self.navigationController.viewControllers = self.navigationController.viewControllers;
        [self transitionToGridLayout];
    }
    else {
        self.hidesBottomBarWhenPushed = YES;
        self.navigationController.viewControllers = self.navigationController.viewControllers;
        [self transitionToCoverflowLayout];
    }
}

The trick is to push your view controller so that the hidesBottomBarWhenPushed flag is picked up. You can use following.

self.navigationController.viewControllers = self.navigationController.viewControllers;