How do I stop endlessly playing SpriteKit emitter?

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