Iphone NSMutablearray中子层的内容

我正在创建一个96x64网格的子层，所以我可以很容易地更新它们的内容

- (void)createLayer{
    CALayer *currentLayer = self.layer;

    _layerArray = [[NSMutableArray alloc] initWithCapacity:WIDTH*HEIGHT];
    int cellSize = self.bounds.size.width / WIDTH;
    double xOffset = 0;

    CGRect cellFrame = CGRectMake(0, 0, cellSize, cellSize);
    NSUInteger cellIndex = 0;
    cellFrame.origin.x = xOffset;

    for (int i = 0; i < WIDTH; i++)
    {
        cellFrame.origin.y = 0;
        for (int j = 0; j < HEIGHT; j++, cellIndex++)
        {                
            if([[self.levelState.boardChanges objectAtIndex:(i*HEIGHT)+j] intValue]==1){
                {
                    NSNumber *currentCell = [self.levelState.board objectAtIndex:cellIndex];
                    CALayer *sublayer = [CALayer layer];
                    sublayer.frame = cellFrame;
                    if (currentCell.intValue == 1)
                    {
                        sublayer.contents = (id) [UIImage imageNamed:@"image1.png"].CGImage;
                    }
                    else if (currentCell.intValue == 0)
                    {
                        sublayer.contents = (id) [UIImage imageNamed:@"image2.png"].CGImage;
                    }
                    [currentLayer addSublayer:sublayer];
                    [_layerArray addObject:sublayer];
                }
            }
            cellFrame.origin.y += cellSize;
        }
        cellFrame.origin.x += cellSize;
    }
}

如何更改它们的内容？我应该改用NSArray吗

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谢谢大家!

我还没有测试过这个，但它看起来似乎可以工作

[sublayer.contents addObject:[UIImage imageNamed:@"image2.png"]];

但是它非常慢

###最终编辑 上面作为主题发布的方法太慢了。。。我的最后方法如下：

UIViewController 他有自己的观点 将Calayer作为子层

子层为： 1.zindex 0处的背景

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2.frontImages是以更高的zindex排序的混合图像…

[[u layerArray objectAtIndex:（i*HEIGHT）+j].contents addObject:[UIImage imagename:@“image1.png”]；抛出一个：“在'id'类型的对象上找不到属性'contents'”可能是这样的：？id subl=[[u layerArray objectAtIndex:（i*高度）+j]；[subl.contents addObject:[UIImage ImageName:@“grass.png”]；

[sublayer.contents addObject:[UIImage imageNamed:@"image2.png"]];

[[_layerArray objectAtIndex:(i*HEIGHT)+j ] setContents:(id) [UIImage imageNamed:@"image.png"].CGImage];