如何添加过渡以在选项卡视图控制器之间进行切换

Question

I added UITabBarViewController to my app and added five ViewControllers . Each VC to one of the TabBarItems . And all of this is working good. But for the third view is made for user to input some data, so I want it to be presented as temporary VC . The usual transition for temporary VC is crossdisolve. This brings the VC up from the bottom.

So my question is how can I make this animation for transition between TabBarItems .

Answer 1

I use this function which takes in the index of the destination view. I would add this function as part of the parent view controller to be called by the sub-view controllers. That's up to you.

-(void) animateTabBarTransition:(NSInteger) destinationTabIdx{
   UIView * fromView = self.tabBarController.selectedViewController.view;
   UIView * toView = [[self.tabBarController.viewControllers objectAtIndex:destinationTabIdx] view];

  [UIView transitionFromView:fromView toView:toView duration:0.8
    options:(destinationTabIdx > self.tabBarController.selectedIndex ? UIViewAnimationOptionTransitionFlipFromLeft: UIViewAnimationOptionTransitionFlipFromRight)
            completion:^(BOOL finished) {
                if (finished) {
                    self.tabBarController.selectedIndex = destinationTabIdx;
                }
}];

}