UICollisionBehavior: Rolling Ball?
I am trying to work on an iOS iPhone app that uses UIKit Dynamics in order to do the physics animation. It's a basketball game where you can throw the ball into the hoop. However, I can't figure out how to make the ball circular (treated this way by the UICollisionBehavior and UIDynamicAnimator )?
I've tried: ball.layer.cornerRadius = ball.frame.size.width / 2.0;
But this only draws the ball circular. It doesn't actually behave this way. I also know I can draw boundaries using: addBoundaryWithIdentifier:forPath:
But I can't figure out how to put bounds around a UIView ( UIImageView in my case) that aren't just a rectangle? I know I could do this using SpriteKit, but I've already written a few hours of code for the basketball game using UIKit Dynamics and don't want to switch over if there is a simple fix. Thank you!
In iOS 9 you can now do exactly what you want.
In your UIView subclass you can add this:
- (UIDynamicItemCollisionBoundsType)collisionBoundsType
{
return UIDynamicItemCollisionBoundsTypeEllipse;
}
You cannot do it using UIKit Dynamics . UIDynamicItem protocol implementation requires the object that implements the protocol to provide a bounds property which is a CGRect .
You have to go for SpriteKit .