collision detection

Question

HI everybody, how can i carry out "collision detection" in my app,which just like this: http://www.gskinner.com/blog/assets/CDTest.swf

Give me some advices,,please..

Answer 1

a good tutorial.

Answer 2

Have a look at CGRectContainsPoint and CGRectIntersectsRect.

Answer 3

Take a look at this:

http://www.youtube.com/watch?v=hdsnxcvNb7Y

hope this helps :)