Emitted particles follow parent node - sprite-kit

Question

I am setting up an SKNode as follows:
- (id)init {
self = [super init];
if (self) {
SKTextureAtlas *atlas = [SKTextureAtlas atlasNamed:#"Sprites"];
SKSpriteNode *spriteNode = [SKSpriteNode spriteNodeWithTexture:[atlas textureNamed:#"Cat"]];
[self addChild:spriteNode];
// Create particle trail
SKEmitterNode *emitterNode = [NSKeyedUnarchiver unarchiveObjectWithFile:[[NSBundle mainBundle] pathForResource:#"Hearts" ofType:#"sks"]];
emitterNode.position = CGPointMake(0, 20);
[self insertChild:emitterNode atIndex:0];
// Setting up the physics
self.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:spriteNode.frame.size];
self.physicsBody.dynamic = YES;
self.physicsBody.affectedByGravity = NO;
}
return self;
}
When this node moves around horizontally along the X-axis, the source of the particle trail moves along with it, which is expected. What is not expected is that emitted particles do this as well, when instead I expect them to move straight up along the Y-axis from their original X position.
Is there a way to prevent this behaviour?
Creation (in scene):
SPAPlayer *player = [[SPAPlayer alloc] init];
player.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));
[self addChild:player];
Movement code:
[node.physicsBody applyForce:CGVectorMake(20 * data.acceleration.x, 0)];
Image for reference:

Answer 1

Make the emitter a child of the sprite (as you already have).
To make the particles move independently from where the player node is, assign the SKEmitterNode's targetNode property, preferably assign it the scene as in:
// be sure self.scene isn't still nil when you do this, for instance in node's init
emitter.targetNode = self.scene;
This will spawn the particles at the player sprite position but they won't travel along with it.