Transition Delegate for UITabBarController animation

Question

I have a custom UIViewControllerAnimationTransition class created already, and need to make this animate a UITabBarController when it switches tabs.

The tabBarController does not use the regular tab bar, though. I have a custom implementation that acts like it, and when a button is pressed, it calls this code:

tabBarController.selectedIndex = index

Currently I have the tabBarController (subclass) as the delegate for its own transitionDelegate. The delegate method animationControllerForPresentedController is never actually called, though.

Is it fine for the tab bar controller to be its own delegate? If so, why is the transition code never actually called?

there's a really good solution here that explains it [enter link description here][1] [1]: http://stackoverflow.com/a/5180104/2855836 — SleepsOnNewspapers, Feb 12 '15 at 22:04

erdekhayser · Accepted Answer · 2014-11-30T20:34:17.130

14

animationControllerForPresentedController is the wrong approach for the tab bar controller.

In the UITabBarController subclass, adopt the UITabBarControllerDelegate protocol and set it as its own delegate. Then, use tabBarController: animationControllerForTransitionFromViewController: toViewController: to return the custom UIViewControllerAnimatedTransitioning object.

To get a better visualization, look at VCTransitionsLibrary in the TabBarDemo folder.

edited Nov 30 '14 at 20:34

answered Jul 24 '14 at 16:15

erdekhayser

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Shouldn't it be `UIViewControllerTransitionDelegate` instead of `UITabBarControllerDelegate`? – André Fratelli Nov 30 '14 at 20:06
No, I mean, shouldn't it be `delegate`, instead of `transitionDelegate`! My bad. – André Fratelli Nov 30 '14 at 20:07
@AndréFratelli don't think so. The delegate and the transition delegate do different things. The delegate handles events like when a button is pressed, while the transition delegate handles animations. – erdekhayser Nov 30 '14 at 20:09
Yes, but it's the delegate and not the transition delegate that implements `tabBarController:animationControllerForTransitionFromViewController:toViewController:` – André Fratelli Nov 30 '14 at 20:30
@AndréFratelli OK I see what you mean. I'm surprised nobody else caught that before :) – erdekhayser Nov 30 '14 at 20:34

score 0 · Answer 2 · answered Jul 24 '14 at 05:11

Did you use these delegate methods like this?

@interface BTSlideInteractor : NSObject <UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate>

- (IBAction)showModalButtonWasTouched:(id)sender
{
    BTSlideInteractor *interactor = [[BTSlideInteractor alloc] init];
    interactor.presenting = YES;

    BTModalViewController *modalController = [self.storyboard instantiateViewControllerWithIdentifier:@"ModalViewController"];
    modalController.modalPresentationStyle = UIModalPresentationCustom;
    modalController.transitioningDelegate = interactor;
    [self presentViewController:modalController animated:YES completion:nil];
}

Use this link for Reference: https://github.com/brightec/CustomViewControllerTransition/blob/master/test/BTViewController.m

If you didnt find the solution kindly add your codes.

Are you saying that the trabsition delegate should be set for the *view controllers* not the tab bar? — erdekhayser, Jul 24 '14 at 12:59

Transition Delegate for UITabBarController animation

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