How do you make images wobble like on the iPhone home screen?

Question

I have many icons in my app and I would like to animate them in a manner similar to what happens when you try to delete applications from the iPhone's home screen. How can you do this?

Additionally, is there a way to have the icons animate up onto the screen in a manner similar to what happens when you unlock the iPhone?

Answer 1

If you want to make your views, images, etc. wobble, like the home screen, you could do something like this:

    CGAffineTransform leftWobble = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(-15.0));
    CGAffineTransform rightWobble = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(15.0));

    view.transform = leftWobble;  // starting point

    [UIView beginAnimations:@"wobble" context:view];
    [UIView setAnimationRepeatAutoreverses:YES];
    [UIView setAnimationRepeatCount:5]; // adjustable
    [UIView setAnimationDuration:0.125];
    [UIView setAnimationDelegate:self];
    view.transform = rightWobble; // end here & auto-reverse
    [UIView commitAnimations];

You would also need to add this define:

#define RADIANS(degrees) ((degrees * M_PI) / 180.0)

Answer 2

with blocks (iOS 4+) it would look like:

#define RADIANS(degrees) ((degrees * M_PI) / 180.0)

    CGAffineTransform leftWobble = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(-2.0));
    CGAffineTransform rightWobble = CGAffineTransformRotate(CGAffineTransformIdentity, RADIANS(2.0));

    cell.transform = leftWobble;  // starting point
    cell.deleteButton.hidden = NO;

    [UIView animateWithDuration:0.125 delay:0 options:(UIViewAnimationOptionRepeat | UIViewAnimationOptionAutoreverse) animations:^{
        cell.transform = rightWobble;
    }completion:^(BOOL finished){
    }];

Answer 3

If you mean icons in the main screen of iOS, I don't think it would be ever possible.

Of course, if you mean icons inside your application, you can do whatever you want.