Strange UITabBarItem bug

[iT0ny]

Note: i can't reproduce this bug,kinda random bug.

When selected,icon shifts to a different position(it may even disappear from the visible view(bar item) frame)

PS i assume there's a problem w/ - (id)_updateImageWithTintColor:(UIColor )tintColor isSelected:(BOOL)selected getImageOffset:(UIOffset )offset;

you are not using offset argument

[youknowone]

Thanks. Could you give me environment hints?

1. OS version
2. SDK version
3. Autolayout usage

[iT0ny]

1. iOS 5/6
2. iOS 7b6
3. Disabled

[iT0ny]

just noticed: it only appears in iPhone UI

[marcdown]

I can consistently recreate this issue on the latest version (0.9.7); it occurs every time I dismiss a modal. I am testing on iOS 6 using the iOS 7 GM SDK with Autolayout disabled.

[youknowone]

Would anyone share me bug-reproducable test project?

[marcdown]

https://dl.dropboxusercontent.com/u/5975955/TabBarTest.zip

Test Project includes a tab bar controller containing 3 tab bar items each pointing to a view controller with a button that displays a modal. Once you dismiss the modal the selected tab bar image is offset by 2px in iOS 6 - I have not tested iOS 5.

[marcdown]

@youknowone any update on this?

[VincentSit]

I also have this bug and I found my reason.

My controller hierarchy like below:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    UIViewController1 *viewController1 = [[UIViewController1 alloc] initWithNibName:nil bundle:nil];
    UIViewController2 *viewController2 = [[UIViewController2 alloc] initWithNibName:nil bundle:nil];
    UIViewController3 *viewController3 = [[UIViewController3 alloc] initWithNibName:nil bundle:nil];
    UIViewController4 *viewController4 = [[UIViewController4 alloc] initWithNibName:nil bundle:nil];
    UIViewController5 *viewController5 = [[UIViewController5 alloc] initWithNibName:nil bundle:nil];

    UINavigationController *navigationController1 = [[UINavigationController alloc] initWithRootViewController:viewController1];
    UINavigationController *navigationController2 = [[UINavigationController alloc] initWithRootViewController:viewController2];
    UINavigationController *navigationController3 = [[UINavigationController alloc] initWithRootViewController:viewController3];
    UINavigationController *navigationController4 = [[UINavigationController alloc] initWithRootViewController:viewController4];
    UINavigationController *navigationController5 = [[UINavigationController alloc] initWithRootViewController:viewController5];

    UITabBarController *tabBarController = [[UITabBarController alloc] initWithNibName:nil bundle:nil];
    tabBarController.viewControllers = @[navigationController1, navigationController2,
                                         navigationController3, navigationController4, navigationController5];
    self.window.rootViewController = self.tabBarController;
}

UIViewController1 with UIViewController6, UIViewController7,UIViewController8 have same super class called SuperClass.

In SuperClass have a method to change the first tabBar view controller:

- (void)foo {
     UIViewController6 *viewController6 = [[UIViewController6 alloc] initWithNibName:nil bundle:nil];
     // in here, self.navigationController is the first viewController in  tabBarController.viewControllers.
     [self.navigationController setViewControllers:@[viewController6] animated:NO];
}

if I call foo, the first tabBarItem will disappear from the tabbar. but if I change the foo like this, the first tabBarItem will not disappear:

- (void)foo {
     UIViewController6 *viewController6 = [[UIViewController6 alloc] initWithNibName:nil bundle:nil];
     // in here, self.navigationController is the first viewController in  tabBarController.viewControllers.
//     [self.navigationController setViewControllers:@[viewController6] animated:NO];
       [self.navigationController pushViewController:viewController6 animated:NO];
}

[bumaociyuan]

@youknowone any update on this?

[kalyan4]

My task is to change tabbar iem position change according to user criteria my if-condition not perfectly working at this point CGPoint touchlocation; [pan locationInView:self.view];

if (tabbarview == nil) { tabbarview =[tbItems objectAtIndex:self.tabBarController.selectedIndex]; [self.tabBarController.view addSubview:tabbarview]; } if (fixedPos == 0) { fixedPos=touchlocation.y;

}[tabbarview removeFromSuperview]; tabbarview.center = touchlocation;

if (pan.state == UIGestureRecognizerStateEnded) { // [tabbarview removefromsuperview] [tabbarview removeFromSuperview]; tabbarview =nil; fixedPos = 0;

if(touchlocation.x<4){

    if (touchlocation.x<=109)
    {
        [tbItems exchangeObjectAtIndex:0 withObjectAtIndex:self.tabBarController.selectedIndex];
        NSMutableArray *tvcs=[[self.tabBarController viewControllers]mutableCopy];
        id tempvc=[tvcs objectAtIndex:self.tabBarController.selectedIndex];
        [tvcs removeObject:tempvc];
        [tvcs insertObject:tempvc atIndex:1];
        [self.tabBarController setViewControllers:tvcs animated:YES];

    }else
    if (touchlocation.x>109 && touchlocation.x<=215)
    {
        [tbItems exchangeObjectAtIndex:1 withObjectAtIndex:self.tabBarController.selectedIndex];
        NSMutableArray *tvcs=[[self.tabBarController viewControllers]mutableCopy];
        id tempvc=[tvcs objectAtIndex:self.tabBarController.selectedIndex];
        [tvcs removeObject:tempvc];
        [tvcs insertObject:tempvc atIndex:2];
        [self.tabBarController setViewControllers:tvcs animated:YES];

    }else if (touchlocation.x>215 )
    {
        [tbItems exchangeObjectAtIndex:2 withObjectAtIndex:self.tabBarController.selectedIndex];
        NSMutableArray *tvcs=[[self.tabBarController viewControllers]mutableCopy];
        id tempvc=[tvcs objectAtIndex:self.tabBarController.selectedIndex];
        [tvcs removeObject:tempvc];
        [tvcs insertObject:tempvc atIndex:3];
        [self.tabBarController setViewControllers:tvcs animated:YES];

    }else
    {
        [tbItems exchangeObjectAtIndex:3 withObjectAtIndex:4];
        NSMutableArray *tvcs=[[self.tabBarController viewControllers]mutableCopy];
        id tempvc=[tvcs objectAtIndex:self.tabBarController.selectedIndex];
        [tvcs removeObject:tempvc];
        [tvcs insertObject:tempvc atIndex:4];
        [self.tabBarController setViewControllers:tvcs animated:YES];
    }

}else
{
    [tbItems exchangeObjectAtIndex:3 withObjectAtIndex:4];
    NSMutableArray *tvcs=[[self.tabBarController viewControllers]mutableCopy];
    id tempvc=[tvcs objectAtIndex:self.tabBarController.selectedIndex];
    [tvcs removeObject:tempvc];
    [tvcs insertObject:tempvc atIndex:4];
    [self.tabBarController setViewControllers:tvcs animated:YES];
}

}