CGRect rect1 = [self positionRect:sheep];
CGRect rect2 = [self positionRect:cow];
if ( ! CGRectIsNull(CGRectIntersection(rect1,rect2))) {
// handle collision
[sheep stopAction:jump_4ever];
}
CGRect rect1 = [self positionRect:sheep];
CGRect rect2 = [self positionRect:cow];
if ( ! CGRectIsNull(CGRectIntersection(rect1,rect2))) {
// handle collision
[sheep stopAction:jump_4ever];
}