How do you test for collisions in Xcode?

In Apple’s Xcode, how do you test for collisions between two possibly moving objects? My current code is this: if (rock.center.x >= player.frame.origin. x && rock.center.x <= player.frame.size. width && rock.center.y >= player.frame.origin.y && rock.center.y <= player.frame.size.height) { but something is off, the code is not working. I do not know what is wrong- it… Continue reading How do you test for collisions in Xcode?