CGPath麻烦？

Question

对下面的代码有点麻烦。点阵列是由寻路算法提供的一组点，该算法给出下面方法中开始和结束CGPoint之间的最短路径。调试了这段代码后，我知道它有效。

我认为它是导致我问题的CGPath，它似​​乎并没有被清除？每当我从算法中产生一条新路径时，玩家总是会回到他最初开始的位置，然后他将沿着应用程序内创建的每条路径的距离移动。每次尝试生成新路径时都会发生这种情况。

任何想法？

-(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); 
} 

有经过的路径，这个代码时某处内存泄漏：

//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); 
} 

如果我评论此代码。随后将内存留50MB左右，在iPad上。如果它没有被注释掉，那么它会继续走得越来越高，直到它崩溃在1.5GB左右。

Answer 1

您发布的代码将创建一个新路径并用点数组中的点填充它。无论是你的点数组总是包含以前的点PLUS你的新点，或场景套件方法followPath：asOffset：orientToPath：duration：将新路径追加到旧的。 （我还没有实际使用过场景套件，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是CGPath，很多只知道ARC的人不会这样做。