CGPath麻烦？

Question

下面的代码有点问题。点数组是由路径查找算法提供的一组点，它给出了在下面的方法中生成的起点和结束CGPoints之间的最短路径。在调试了这段代码之后，我知道它能工作。

我认为是CGPath引起了我的问题，它似乎没有清理？每当我从算法中生成一个新路径时，玩家总是回到他最初开始的位置，然后他将沿着应用程序中创建的每条路径的距离移动。每次我尝试生成一条新的路径时，都会发生这种情况。

有什么想法吗？

-(void)doubleTap:(UITapGestureRecognizer *)touchPoint
{
    CGPoint touchLocation = [touchPoint locationInView:touchPoint.view];
    touchLocation = [self convertPointFromView:touchLocation];

    //on double tap take the location of the player and the location tapped and pass it to the path finder.
    CGPoint start = CGPointMake((int)(player.position.x/SPACING), (int)(player.position.y/SPACING));
    CGPoint end = CGPointMake((int)(touchLocation.x/SPACING), (int)(touchLocation.y/SPACING));
    NSMutableArray *points = [NSMutableArray arrayWithArray:[self reverseArray:[pathFinder findPath:start End:end]]];

    //convert path to moveable path for sprite, move sprite along this path.
    CGMutablePathRef path = CGPathCreateMutable();

    if (points.count > 0)
    {
        PathFindingNode *firstNode = [points objectAtIndex:0];
        CGPathMoveToPoint(path, NULL, firstNode.position.x, firstNode.position.y);

        for (int i = 1; i < points.count; i++)
        {
            firstNode = [points objectAtIndex:i];
            CGPathAddLineToPoint(path, NULL, firstNode.position.x, firstNode.position.y);
        }
    }

    SKAction *hover = [SKAction followPath:path asOffset:NO orientToPath:YES duration:2.0];
    [player runAction: [SKAction repeatAction:hover count:1]];
    [points removeAllObjects];
    CGPathRelease(path);
}

当传递到此代码的路径时，某个地方出现了内存泄漏：

 //convert path to moveable path for sprite, move sprite along this path.
    CGMutablePathRef path = CGPathCreateMutable();

    if (points.count > 0)
    {
        PathFindingNode *firstNode = [points objectAtIndex:0];
        CGPathMoveToPoint(path, NULL, firstNode.position.x, firstNode.position.y);

        for (int i = 1; i < points.count; i++)
        {
            firstNode = [points objectAtIndex:i];
            CGPathAddLineToPoint(path, NULL, firstNode.position.x, firstNode.position.y);
        }
    }

    SKAction *hover = [SKAction followPath:path asOffset:NO orientToPath:YES duration:2.0];
    [player runAction: [SKAction repeatAction:hover count:1]];
    [points removeAllObjects];
    CGPathRelease(path);
}

如果我注释掉这段代码，那么iPad上的内存将保持在50 an左右。如果它没有被注释掉，那么它就会越来越高，直到它在1.5gb左右崩溃。

Answer 1

您发布的代码将创建一个新路径，并将其填充到点数组中的各个点中。无论是您的点数组总是包含前面的点加上您的新点，还是场景工具包方法跟随路径:asOffset:orientToPath:D时程:是将新路径追加到旧路径。(我还没有真正使用过现场工具包，所以我不知道最后的可能性。)

无论如何，您的CGPath处理代码看起来不错。你记得CGRelease CGPath，很多只知道ARC的人不知道。