////////////Template code
//////////// Chunk 4 GameScene.m

//Add to touchesBegan
    [self trackPaddlesToMotivatingTouches];




- (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self trackPaddlesToMotivatingTouches];
}


- (void)trackPaddlesToMotivatingTouches
{
        
    id a = @[@{@"node": [self childNodeWithName:@"left_paddle"],
               @"touch": self.leftPaddleMotivatingTouch ?: [NSNull null]},
             @{@"node": [self childNodeWithName:@"right_paddle"],
               @"touch": self.rightPaddleMotivatingTouch ?: [NSNull null]}];
    
    for (NSDictionary *o in a) {
        SKNode *node = o[@"node"];
        UITouch *touch = o[@"touch"];
        if ([[NSNull null] isEqual:touch])
            continue;

        CGFloat yPos = [touch locationInNode:self].y;
        NSTimeInterval duration = ABS(yPos - node.position.y) / kTrackPixelsPerSecond;

        SKAction *moveAction = [SKAction moveToY:yPos duration:duration];
        [node runAction:moveAction withKey:@"moving!"];
    }
}