How do I animate/rotate a UIView 90 degress from its upper right corner?

Question

I've been searching for hours trying to find a way to animate/rotate a UIView 90 degrees from the upper right corner.

The effect should almost work like a swinging door from the top of the screen.

Hope someone can help!

Answer 1

So right after I pressed enter I suddenly put two and two together and figured the Metronome sample worked kind of like a swinging door and that led me to a few other possibilities.

Here's my solution:

- (void)viewDidLoad {
    [super viewDidLoad];

    // Set the anchor point and center so the view swings from the upper right
    swingView.layer.anchorPoint = CGPointMake(1.0, 0.0);
    swingView.center = CGPointMake(CGRectGetWidth(self.view.bounds), 0.0);

    // Rotate 90 degrees to hide it off screen
    CGAffineTransform rotationTransform = CGAffineTransformIdentity;
    rotationTransform = CGAffineTransformRotate(rotationTransform, DegreesToRadians(90));
    swingView.transform = rotationTransform;
}

...

- (void)animateSwing {

    CGAffineTransform swingTransform = CGAffineTransformIdentity;
    swingTransform = CGAffineTransformRotate(swingTransform, DegreesToRadians(0));

    [UIView beginAnimations:@"swing" context:swingView];
    [UIView setAnimationDuration:0.25];

    swingView.transform = swingTransform;

    [UIView commitAnimations];
}

Hope this helps someone else too!