gistfile1.m

    if (direction == self.hero.direction) {
        self.isAnimating = YES;
        [self.hero runAction:[SKAction moveByX:moveByX y:moveByY duration:[self.hero stepAnimationDuration]]];
        [self.hero runStepAnimation:^{
            self.isAnimating = NO;
        }];
    }
    else {
        [self.hero changeDirection:direction];
    }