Cocos2d -- Check if place is free before moving (all objects) - objective-c

Question

Is there a method in Cocos2d like CGRectIntersectsRect, except instead of limiting it to one sprite, it checks for ALL objects?

Answer 1

You can do it in a loop. This example is a method for a sprite instance (i.e. the player) to test against an array of other sprites.
- (BOOL) checkForCollision
{
BOOL didCollide = NO;
CGRect myRect;
CGRect testRect;
// assuming anchor point is in the center
myRect = CGRectMake(self.position.x - self.contentSize.width /2,
self.position.y - self.contentSize.height /2,
self.contentSize.width,
self.contentSize.height);
for (CCSprite * currSprite in listOfWallSprites) {
testRect = CGRectMake(currSprite.position.x - currSprite.contentSize.width /2,
currSprite.position.y - currSprite.contentSize.height /2,
currSprite.contentSize.width,
currSprite.contentSize.height);
if ( CGRectIntersectsRect(myRect, testRect) ) {
didCollide = YES;
return didCollide;
}
}
return didCollide;
}

Answer 2

you can set up a method like this
CGRect sprite1Rect = CGRectMake(
sprite1.position.x - (sprite1.contentSize.width/2),
sprite1.position.y - (sprite1.contentSize.height/2),
sprite1.contentSize.width,
sprite1.contentSize.height);
CGRect somethingRect = CGRectMake(
something.position.x - (something.contentSize.width/2),
something.position.y - (something.contentSize.height/2),
something.contentSize.width,
something.contentSize.height);
CGRect something2Rect = CGRectMake(
something2.position.x - (something2.contentSize.width/2),
something2.position.y - (something2.contentSize.height/2),
something2.contentSize.width,
something2.contentSize.height);
if (CGRectIntersectsRect(sprite1Rect, somethingRect) || CGRectIntersectsRect(sprite1Rect, something2Rect)) {
// do something
}
or
if (CGRectIntersectsRect(sprite1.frame, something.frame) || CGRectIntersectsRect(sprite1Rect, something2Rect)) {
// do something
}
this means that if sprite1 intersects something OR something2 then it will do something