cs193p – Assignment #4 Extra Task #4

Please note, this blog entry is from a previous course. You might want to check out the current one.

Think of some other way(s) to use animation in your application and implement it.

What happens if you shake your iPhone? The card go crazy:

- (BOOL)canBecomeFirstResponder
{
    return YES;
}

- (void)viewDidAppear:(BOOL)animated
{
    [self becomeFirstResponder];
}

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    if (motion == UIEventSubtypeMotionShake) {
        if (!self.pileAnimator) {
            self.pileAnimator = [[UIDynamicAnimator alloc] initWithReferenceView:self.gridView];
            UIGravityBehavior *gravity = [[UIGravityBehavior alloc] initWithItems:self.cardViews];
            [self.pileAnimator addBehavior:gravity];
            UICollisionBehavior *collision = [[UICollisionBehavior alloc] initWithItems:self.cardViews];
            collision.translatesReferenceBoundsIntoBoundary = YES;
            [self.pileAnimator addBehavior:collision];
            UIDynamicItemBehavior *item = [[UIDynamicItemBehavior alloc] initWithItems:self.cardViews];
            item.elasticity = 1.1;
            [self.pileAnimator addBehavior:item];
        } else {
            self.pileAnimator = nil;
            [self updateUI];
        }
    }
}

… if you shake again, the return to their assigned places, but the might still be crazy (just throw them away and deal a new deck):

The complete code is available on github.