Uitabbar Items Jumping on Back Navigation on iOS 12.1

UITabBar items jumping on back navigation on iOS 12.1

In your UITabBarController, set isTranslucent = false

Incorrect display of items on UITabBarController

In your UITabBarController, set
isTranslucent = false

thanks Vanya

How to correct Tab Bar height issue on iPhone X

"File inspector" from right of Xcode storyboard, enable Safe Area guide layout to support your app in iPhone

This post describes it really well.

Weird frame calculation for UITabBar

I found the same behavior on iOS9 in two cases:

1) while immediate rotation during the pop-navigation in UINavigationController;

2) on rotation from landscape to portrait while watching full-screen video player and closing player after that.

To solve the problem on iOS8+ you should subclass UITabBarController and implement method from UIContentContainer protocol as follows:

- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
{
    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];

    if (!self.tabBar.window) return;

    [coordinator animateAlongsideTransition: ^(id<UIViewControllerTransitionCoordinatorContext>  _Nonnull context) {
         CGRect newBounds = self.tabBar.bounds;
         newBounds.size.width = size.width;
         self.tabBar.bounds = newBounds;

         [self.view.superview setNeedsLayout];
     }
                             completion: nil];
}

If you don't write return string you won't fix the 2nd issue.

Adding same in Swift:

extension UITabBarController {
    public override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
        super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
        if let _ = self.tabBar.window {
            coordinator.animateAlongsideTransition( { (context) in
                self.tabBar.bounds.size.width = size.width
                self.view.superview?.setNeedsLayout()
                }, completion: nil)
        }
    }
}

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