ios - UIView vertical flip animation

Question

I have an iOS UIView with UIViewAnimationTransitionFlipFromRight. I need it to flip vertically though. The page curl transition won't cut it. I assume this will require something custom.

Any ideas?

Answer 1

Just write your own method for the flip using Core Animation Transforms.

- (void)verticalFlip{
    [UIView animateWithDuration:someDuration delay:someDelay animations:^{
        yourView.layer.transform = CATransform3DMakeRotation(M_PI,1.0,0.0,0.0);
    } completion:^{
        // code to be executed when flip is completed
    }];
}

Make sure you have the Core Animation libraries/frameworks added and included and also have included math.h if you want to use the M_PI notation.

EDIT:

To have it essentially "change" the view when it's halfway flipped do something like this:

- (void)verticalFlip{
    [UIView animateWithDuration:someDuration delay:someDelay animations:^{
        yourView.layer.transform = CATransform3DMakeRotation(M_PI_2,1.0,0.0,0.0); //flip halfway
    } completion:^{
        while ([yourView.subviews count] > 0)
            [[yourView.subviews lastObject] removeFromSuperview]; // remove all subviews
        // Add your new views here 
        [UIView animateWithDuration:someDuration delay:someDelay animations:^{
            yourView.layer.transform = CATransform3DMakeRotation(M_PI,1.0,0.0,0.0); //finish the flip
        } completion:^{
            // Flip completion code here
        }];
    }];
}

This could also work:

- (void)verticalFlip{

    // Do the first half of the flip
    [UIView animateWithDuration:someDuration delay:someDelay animations:^{
        yourView.layer.transform = CATransform3DMakeRotation(M_PI_2,1.0,0.0,0.0); //flip halfway
    } completion:^{
        while ([yourView.subviews count] > 0)
            [[yourView.subviews lastObject] removeFromSuperview]; // remove all subviews
        // Add your new views here 
    }];

    // After a delay equal to the duration+delay of the first half of the flip, complete the flip
    [UIView animateWithDuration:someDuration delay:durationOfFirstAnimation animations:^{
        yourView.layer.transform = CATransform3DMakeRotation(M_PI,1.0,0.0,0.0); //finish the flip
    } completion:^{
        // Flip completion code here
    }];
}

Cheers.