iOS Hiding tab bar in iOS 6 creates black bar (fix

问题:

I've got a tabbed application and in one tab there is a UIWebView. When I rotate the device to landscape I've made the UIWebView full screen while hiding the status and tab bar.

I've got it working in iOS 6 - originally when rotating and hiding the tab bar it would leave a black space where the tab bar was, so the fHeight code fixes this. However, on iOS 6 it worked perfectly, but now it actually creates the black bar problem iOS 6 was having!! Any ideas for a workaround to this?

Please see my edit below this

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;
{
    if(toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft || toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) {
        [self hideTabBar:self.tabBarController];
        [[UIApplication sharedApplication] setStatusBarHidden:TRUE withAnimation:UIStatusBarAnimationSlide];
    }
    else
    {
        [self showTabBar:self.tabBarController];
        [[UIApplication sharedApplication] setStatusBarHidden:FALSE withAnimation:UIStatusBarAnimationSlide];
    }
}

- (void) hideTabBar:(UITabBarController *) tabbarcontroller
{
    CGRect screenRect = [[UIScreen mainScreen] bounds];

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5];
    float fHeight = screenRect.size.height;
    if(  UIDeviceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation) )
    {
        fHeight = screenRect.size.width;
    }

    for(UIView *view in self.tabBarController.view.subviews)
    {
        if([view isKindOfClass:[UITabBar class]])
        {
            [view setFrame:CGRectMake(view.frame.origin.x, fHeight, view.frame.size.width, view.frame.size.height)];
        }
        else
        {
            [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, fHeight)];
            view.backgroundColor = [UIColor blackColor];
        }
    }
    [UIView commitAnimations];
}

- (void) showTabBar:(UITabBarController *) tabbarcontroller
{
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    float fHeight = screenRect.size.height - 49.0;

    if(  UIDeviceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation) )
    {
        fHeight = screenRect.size.width - 49.0;
    }

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationDuration:0.5];
    for(UIView *view in tabbarcontroller.view.subviews)
    {
        if([view isKindOfClass:[UITabBar class]])
        {
            [view setFrame:CGRectMake(view.frame.origin.x, fHeight, view.frame.size.width, view.frame.size.height)];
        }
        else
        {
            [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, fHeight)];
        }
    }
    [UIView commitAnimations];
}

//Edit

I've tried using this but I'm not sure how to pass in the view properly - I've tried self.view and webView and others but I can't get it to work on both iOS 6 and 7! Any kind of idea at all would be really helpful! Let me know if you need more info

- (void)setTabBarHidden:(BOOL)hidden view:(UIView *)view animated:(BOOL)animated
{
    if (self.tabBar.hidden == hidden)
        return;

    CGRect screenRect = [[UIScreen mainScreen] bounds];
    float height = 0.0f;

    if(UIDeviceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation))
    {
        height = screenRect.size.width;
    }
    else
    {
        height = screenRect.size.height;
    }

    if (!hidden)
    {
        height -= CGRectGetHeight(self.tabBar.frame);
    }

    void (^workerBlock)() = ^() {

        self.tabBar.frame = CGRectMake(CGRectGetMinX(self.tabBar.frame), height, CGRectGetWidth(self.tabBar.frame), CGRectGetHeight(self.tabBar.frame));
        view.frame = CGRectMake(CGRectGetMinX(view.frame), CGRectGetMinY(view.frame), CGRectGetWidth(view.frame), height);
    };

    void (^completionBlock)(BOOL finished) = ^(BOOL finished) {
        self.tabBar.hidden = hidden;
    };

    if (animated)
    {
        [UIView animateWithDuration:0.25f animations:workerBlock completion:completionBlock];
    }
    else
    {
        workerBlock();
        completionBlock(YES);
    }
}

回答1:

I've created a a public Gist on Github for how we're doing this.

This solution has gone through several iterations due to @Chris Byatt and our team trying it out. So, make sure you download the latest revision from there.

The method signature has been simplified to

- (void)setTabBarHidden:(BOOL)hidden animated:(BOOL)animated;

You can call it like this within your UIViewController subclass:

[self.tabBarController setTabBarHidden:YES animated:YES];

回答2:

OK guys, after struggling with this for about two hours, my colleague taught me the right way to do it. There is actually a very simple fix that I can't find online:

just put :

        self.hidesBottomBarWhenPushed = YES;

In the init method of your viewController and comment out the self.tabBar.hidden related code.

回答3:

I eventually got this working, but it took a while. It stemmed from a mixture of my original code and some of JRG-Developers work.

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation {

    BOOL toLandscape = UIDeviceOrientationIsLandscape([UIApplication sharedApplication].statusBarOrientation);

    CGRect screenRect = [[UIScreen mainScreen] bounds];

    void (^workerBlock)() = ^() {


        [[UIApplication sharedApplication] setStatusBarHidden:toLandscape withAnimation:UIStatusBarAnimationSlide];

        float height = toLandscape ? screenRect.size.width : screenRect.size.height - CGRectGetHeight(self.tabBarController.tabBar.frame);

        float width = toLandscape ? screenRect.size.height : screenRect.size.width;

        webView.frame = CGRectMake(CGRectGetMinX(webView.frame),
                               CGRectGetMinY(webView.frame),
                               width,
                               height);

        [self moveTabBarToPosition:height];
    };

    [UIView animateWithDuration:0.25f animations:workerBlock];
}
//Moving the tab bar and its subviews offscreen so that top is at position y
-(void)moveTabBarToPosition:(int)y {
    self.tabBarController.tabBar.frame = CGRectMake(self.tabBarController.tabBar.frame.origin.x, y, self.tabBarController.tabBar.frame.size.width, self.tabBarController.tabBar.frame.size.height);

    for(UIView *view in self.tabBarController.view.subviews) {
        if ([view isKindOfClass:[UITabBar class]]) {
            [view setFrame:CGRectMake(view.frame.origin.x, y, view.frame.size.width, view.frame.size.height)];
        } else {
            [view setFrame:CGRectMake(view.frame.origin.x, view.frame.origin.y, view.frame.size.width, y)];
            view.backgroundColor = [UIColor blackColor];
        }
    }
}

In my case this is for my webview but theoretically you can give it any view. Works in iOS 6 and 7

回答4:

-(void) hideBottomTabs{
// Get the size of the main screen
CGRect fullScreenRect = [[UIScreen mainScreen]bounds];
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0){
    UITabBar *bar = ((UITabBarController *)self.parentViewController).tabBarController.tabBar;
    fullScreenRect.size.height += ViewHeight(bar);
}
// Hide the tab bar
((UITabBarController *)self.parentViewController).tabBarController.tabBar.hidden = YES;
// Resize and fill the screen
[[((UITabBarController *)self.parentViewController).view.subviews objectAtIndex:0] setFrame:fullScreenRect];

}

I have solved my problem in a such way.