How do I stop endlessly playing SpriteKit emitter? - sprite-kit

Question

I am trying to stop emitter playing endlessly in my Sprite Kit project. The Lifetime setting is set to Start=1 and End=0 and it shows correct result that I want (emits only once).
Problem comes when I call it in update method it keeps emitting endlessly, I tried using removeFromParent and removeAllAction but no luck. Can you please help me with the solution here?
-(void)update:(NSTimeInterval)currentTime {
[self updateheartPositionFromMotionManager];
[self matchIt];
if ( _heart.position.x == 512 && _heart.position.y == 484 ){
SKEmitterNode *emitter = [NSKeyedUnarchiver unarchiveObjectWithFile:
[[NSBundle mainBundle] pathForResource:#"sparkly" ofType:#"sks"]];
emitter.position = CGPointMake(self.frame.size.width/2,
CGRectGetMidY(self.frame)+100);;
emitter.name = #"exhaust";
emitter.targetNode =_heart;
[self addChild:emitter];
}else{
[self removeFromParent];
}
}

Answer 1

//step 1 take a global variable
#property BOOL sparklyAdded; in your .h file
inside init or instance method of your .m file
sparklyAdded=FALSE;
-(void)particleAdded
{
}
-(void)update:(NSTimeInterval)currentTime {
[self updateheartPositionFromMotionManager];
[self matchIt];
if (( _heart.position.x>= 512 && _heart.position.y=< 484 ) && !sparklyAdded){
SKEmitterNode *emitter = [NSKeyedUnarchiver unarchiveObjectWithFile:
[[NSBundle mainBundle] pathForResource:#"sparkly" ofType:#"sks"]];
emitter.position = CGPointMake(self.frame.size.width/2,
CGRectGetMidY(self.frame)+100);;
emitter.name = #"exhaust";
emitter.targetNode =_heart;
[self addChild:emitter];
sparklyAdded=TRUE;
}else{
[self removeEffect];
}
}
-(void) removeEffect
{
[self enumerateChildNodesWithName:#"exhaust" usingBlock:^(SKNode *node, BOOL *stop) {
[node removeAllActions];
[node removeFromParent];
sparklyAdded=FALSE;
}];
}
//remember few thighs while adding particle
1) they are expenisive cpu call so add and remove them only once from update loop