Question

我创建一个96x 64网格的子图层，所以我可以轻松更新他们的.contents ......

- (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;
    }
}

然而，我确实失败了......我尝试过的是那种......

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

我如何更改他们的.contents？我应该使用NSArray吗？

谢谢！

Answer 1

我没有对此进行测试，但看起来好像可以正常使用

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

Answer 2

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

但它很慢......

###最终编辑

上面发布的主题方法很慢......我的最终方法如下：

的UIViewController 有UIView 将CALayers作为子图层

子层是： 1. zindex 0的背景 2. frontImages是在更高的zindexes上混合的图像......

在NSMutablearray中更改子层的.contents

2 个答案: