spritekit didBeginContact not called - ios

Question

didBeginContact doesnt get called for some reason. How can I fix this? Thanks! I set the category bitmasks and the skphysicsContactDelegate, yet it is still not registering contacts. I've been stuck at this for some time now.
#import "MyScene.h"
#import "FuelNode.h"
#import "SKSpriteNode+DebugDraw.h"
typedef NS_OPTIONS(uint32_t, CollisionCategory) {
CollisionCategoryPlayer = 1 << 0,
CollisionCategoryFuel = 1 << 1,
};
#interface MyScene() <SKPhysicsContactDelegate>
#end
#implementation MyScene
{
SKNode *_playerNode;
SKNode *_backgroundNode;
SKNode *_foreGround;
}
-(id)initWithSize:(CGSize)size
{
if (self = [super initWithSize:size]) {
self.physicsWorld.contactDelegate = self;
_backgroundNode = [self createBackground];
[self addChild:_backgroundNode];
_foreGround = [SKNode node];
[self addChild:_foreGround];
//add a fuelNode
FuelNode *fuel = [self createFuelAtPosition:CGPointMake(160, 440)];
[_foreGround addChild:fuel];
_playerNode = [self createPlayer];
[_foreGround addChild:_playerNode];
SKAction *actionMove = [SKAction moveToY:-100 duration:3.0];
[fuel runAction:actionMove];
NSLog(#"yea");
}
return self;
}
-(SKNode *)createPlayer
{
CGSize playerPhysicsBody;
//Create player
SKNode *playerNode = [SKNode node];
SKSpriteNode *player = [SKSpriteNode spriteNodeWithImageNamed:#"wship-3.png"];
player.position = CGPointMake(self.size.width/2, 120);
[playerNode addChild:player];
//Add physics
playerPhysicsBody = CGSizeMake(player.size.width/2, player.size.height/2);
playerNode.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:playerPhysicsBody];
playerNode.physicsBody.dynamic = NO;
//Setup collision settings
playerNode.physicsBody.usesPreciseCollisionDetection = YES;
playerNode.physicsBody.categoryBitMask = CollisionCategoryPlayer;
playerNode.physicsBody.collisionBitMask = 0;
playerNode.physicsBody.contactTestBitMask = CollisionCategoryFuel;
[player attachDebugRectWithSize:playerPhysicsBody];
return playerNode;
}
-(SKNode *)createBackground
{
//Create background
SKNode *bgNode = [SKNode node];
SKSpriteNode *bg = [SKSpriteNode spriteNodeWithImageNamed:#"purple"];
bg.anchorPoint = CGPointZero;
[bgNode addChild:bg];
return bgNode;
}
- (FuelNode *)createFuelAtPosition:(CGPoint)position
{
// 1
FuelNode *node = [FuelNode node];
[node setPosition:position];
[node setName:#"NODE_FUEL"];
// 2
SKSpriteNode *sprite;
sprite = [SKSpriteNode spriteNodeWithImageNamed:#"fuelBlue"];
[node addChild:sprite];
// 3
CGSize contactSize = CGSizeMake(sprite.size.width/2, sprite.size.height/2);
node.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:contactSize];
// 4
node.physicsBody.dynamic = NO;
//Setup collision settings
node.physicsBody.categoryBitMask = CollisionCategoryFuel;
node.physicsBody.collisionBitMask = 0;
//node.physicsBody.contactTestBitMask = CollisionCategoryPlayer;
[sprite attachDebugRectWithSize:contactSize];
//SKAction *actionMove = [SKAction moveToY:-100 duration:3.0];
//[node runAction:actionMove];
return node;
}
-(void)didBeginContact:(SKPhysicsContact *)contact
{
BOOL fuelCollision = NO;
SKNode *other = (contact.bodyA.node != _playerNode) ? contact.bodyA.node : contact.bodyB.node;
NSLog(#"collision");
fuelCollision = [(GameObjectNode *)other collisionWithPlayer:_playerNode];
}
#end

Answer 1

In order to enable contact detection, you need to set
node.physicsBody.dynamic = YES;
Have a look at the documentation as well.

Answer 2

Fixed! In the create player method I have mistakenly set the position of the player sprite instead of setting the position of the player node!