CODEWITHSUNDEEP
iosobjective-cuitabbarcontrolleruiviewanimation
Zigglzworth
Zigglzworth

Reputation: 6803

iOS / Objective c - UITabBarControllerDelegate - Custom tab animation delegates not called

I am trying to create a custom tabbar animation when a user taps on a tab bar button.

I have implemented a UITabBarController subclass that implements UITabBarControllerDelegate

here is the .m

#import "MYCustomTabBarControler.h"


@interface MYCustomTabBarControler ()

@end

@implementation MYCustomTabBarControler

- (void)viewDidLoad {
    [super viewDidLoad];

    self.delegate = self; // I set the delegate as self

}


#pragma mark - UITabBarControllerDelegate

- (BOOL)tabBarController:(UITabBarController *)tabBarController
shouldSelectViewController:(UIViewController *)viewController {

    //This is called so I know the delegate is working 
    NSLog(@"The tabBarController delegate is set and working");
    return YES;
}

//This delegate method is never called 
- (id<UIViewControllerAnimatedTransitioning>)tabBarController:(UITabBarController *)tabBarController
           UIViewControllerAnimatedTransitioning:(UIViewController *)fromVC
                                             toViewController:(UIViewController *)toVC {


    MYBarTransition *animator = [MYBarTransition new];
    return animator;

}

//This delegate method is never called 
- (id<UIViewControllerInteractiveTransitioning>)tabBarController:(UITabBarController *)tabBarController
                     interactionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController {

    MYBarTransition *animator = [MYBarTransition new];
    return animator;
}

For some reason the delegate methods responsible for transitioning are NOT called. I have read the docs and can't see any reason they would not be called.

I have set my delegate correctly and confirmed it is working by implementing the shouldSelectViewController method

What am I missing here?

Upvotes: 0

Views: 489

Answers (1)

john_ryan
john_ryan

Reputation: 1787

I think you are using the wrong delegate method for what you are trying to accomplish. Try using:

- (nullable id <UIViewControllerAnimatedTransitioning>)tabBarController:(UITabBarController *)tabBarController
            animationControllerForTransitionFromViewController:(UIViewController *)fromVC
                                              toViewController:(UIViewController *)toVC;

This will be called when the user taps on a different tab.

Upvotes: 3

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