Animation when tab changing

Question

I want to change to another tab but i also want to open it from bottom. Like a vertical transition.

I was trying to do like this :

  -(void)test{

    UIView * toView = [[self.tabBarController.viewControllers objectAtIndex:1] view];


    UIImage *img=[self imageWithView:toView];



    [UIView transitionWithView:img
                      duration:1.0f
                       options:UIViewAnimationOptionCurveEaseIn
                    animations:^{
                        self.tabBarController.selectedIndex = 0;
                    } completion:NULL];



}

- (BOOL)tabBarController:(UITabBarController *)tabBarController
shouldSelectViewController:(UIViewController *)viewController{
    return false;
}
- (UIImage *) imageWithView:(UIView *)view
{
    UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();







    return img;
}

but it's not the effect that i want . Any ideea?

so when you select the tab, you want to present view controller from the bottom ? — Teja Nandamuri, Oct 08 '15 at 13:45

score 0 · Answer 1 · edited May 23 '17 at 12:29

0

This is my solution:

Firstly. return false in the UITabBarController' delegate. So the system won't change the tab immediately when user selecting the tab.
- (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController

Secondly. Capture your toView to an image

Thirdly. Do any animation you want with the imageView.

Finally. Set selectedIndex of your tabBarController and remove the imageView when the animation completed.

Feel free to ask me. Thanks!

edited May 23 '17 at 12:29

Community

1
1

answered Oct 12 '15 at 08:49

hzwzw

1,042
12
17

@AdinaMarin Add the image to UIWindow with a origin frame(maybe outside of the screen). then do the animation that moving the image to the view frame. – hzwzw Oct 12 '15 at 16:24

Animation when tab changing

1 Answers1