How do I draw a circle UIView that acts like one with UICollisionBehavior?

Question

In my app, I'm currently drawing a basic view, and then I'm trying to round it's corners using a CAShapeLayer, but the UICollisionBehavior still reacts like it's a square that is drawn.

Here's an example of my code

  UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.bounds
                                           byRoundingCorners:UIRectCornerAllCorners
                                                 cornerRadii:radiiSize];

// Mask the container view’s layer to round the corners.
CAShapeLayer *cornerMaskLayer = [CAShapeLayer layer];
[cornerMaskLayer setPath:path.CGPath];
self.containerView.layer.mask = cornerMaskLayer;
self.containerView.layer.allowsEdgeAntialiasing = YES;

It looks like UIKit Dynamics is limited to rectangular shapes. A core design decision was to be low overhead, so it's a pretty simplistic engine. — Brian Nickel, Jan 25 '14 at 22:47

Ethan Fang · Answer 1 · 2014-01-21T03:14:55.863

-3

Just do this rather than use UIBezierPath

self.containerView.layer.cornerRadius = [Radius is half the height/width];
self.containerView.clipsToBounds = YES;

edited Jan 21 '14 at 03:14

answered Jan 21 '14 at 02:58

Ethan Fang

1,271
10
15

I've tried this, still behaves like a square. So weird. I don't want to try and hack in Sprite Kit. – Justin Cabral Jan 21 '14 at 03:00
I have used it in ImageView and it works there. I am trying it on normal UIView right now. – Ethan Fang Jan 21 '14 at 03:02
Could you show me the snippet of your code that gets this to work? Would be extremely grateful. – Justin Cabral Jan 21 '14 at 03:03
Just those two lines on your viewDidLoad. I have tested it. – Ethan Fang Jan 21 '14 at 03:08
Still won't work for some reason. Do you have a github where you could host a quick project? – Justin Cabral Jan 21 '14 at 03:13
I have. But you can just create one view, then set layer cornerRadius. Then set clipsToBounds. It will work. Just try to replace your code with the code above. – Ethan Fang Jan 21 '14 at 03:15
Still doesn't work. I have no idea what I could be doing wrong. – Justin Cabral Jan 21 '14 at 06:22
Do you have a link of your source code somewhere so that I can have a look? Or you can send the source code to ethan.fang@hotmail.com and I will fix it for you. – Ethan Fang Jan 26 '14 at 02:54

How do I draw a circle UIView that acts like one with UICollisionBehavior?

1 Answers1