Question

我正在试图弄清楚为什么iOS会以严厉的方式崩溃我的应用程序（没有崩溃日志，立即羞辱黑屏死机与旋转器显示一段时间）。当我使用Quartz为CALayer渲染内容时会发生这种情况。我怀疑内存问题（仅在设备上进行测试时发生），但内存日志以及仪器分配日志看起来还不错。让我过去致命的功能：

- (void)renderTiles{

    if (rendering) {
        //NSLog(@"====== RENDERING TILES SKIP =======");
        return;
    }
    rendering = YES;



    CGRect b = tileLayer.bounds;
    CGSize s = b.size;
    CGFloat imageScale = [[UIScreen mainScreen] scale];
    s.height *= imageScale;
    s.width *= imageScale;

    dispatch_async(queue, ^{

        NSLog(@"");
         NSLog(@"====== RENDERING TILES START =======");

        NSLog(@"1. Before creating context");
        report_memory();

        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
        NSLog(@"2. After creating color space");
        report_memory();

        NSLog(@"3. About to create context with size: %@", NSStringFromCGSize(s));
        CGContextRef ctx = CGBitmapContextCreate(NULL, s.width, s.height, 8, 0, colorSpace, kCGImageAlphaPremultipliedLast);

        NSLog(@"4. After creating context");
        report_memory();

        CGAffineTransform flipTransform = CGAffineTransformMake(1.0, 0.0, 0.0, -1.0, 0.0, s.height);
        CGContextConcatCTM(ctx, flipTransform);

        CGRect tileRect = CGRectMake(0, 0, tileImageScaledSize.width, tileImageScaledSize.height);
        CGContextDrawTiledImage(ctx, tileRect, tileCGImageScaled);

        NSLog(@"5. Before creating cgimage from context");
        report_memory();

        CGImageRef cgImage = CGBitmapContextCreateImage(ctx);
        NSLog(@"6. After creating cgimage from context");
        report_memory();

        dispatch_sync(dispatch_get_main_queue(), ^{
            tileLayer.contents = (id)cgImage;        
        });

        NSLog(@"7. After asgning tile layer contents = cgimage");
        report_memory();

        CGColorSpaceRelease(colorSpace);
        CGContextRelease(ctx);
        CGImageRelease(cgImage);

        NSLog(@"8. After releasing image and context context");
        report_memory();


        NSLog(@"====== RENDERING TILES END =======");
        NSLog(@"");
        rendering = NO;

    });
}

以下是日志：

====== RENDERING TILES START =======
1. Before creating context
    Memory in use (in bytes): 28340224 / 519442432 (5.5%)
2. After creating color space
    Memory in use (in bytes): 28340224 / 519442432 (5.5%)
3. About to create context with size: {6324, 5208}
4. After creating context
    Memory in use (in bytes): 28344320 / 651268096 (4.4%)
5. Before creating cgimage from context
    Memory in use (in bytes): 153649152 / 651333632 (23.6%)
6. After creating cgimage from context
    Memory in use (in bytes): 153649152 / 783159296 (19.6%)
7. After asgning tile layer contents = cgimage
    Memory in use (in bytes): 153653248 / 783253504 (19.6%)
8. After releasing image and context context
     Memory in use (in bytes): 21688320 / 651288576 (3.3%)
====== RENDERING TILES END =======

应用程序在随机位置崩溃。有时在达到函数的时候，有时候是随机步骤。

我应该在哪个方向寻找解决方案？ GDC是否可能导致问题？或者可能是上下文大小或某些Core Animation底层引用？

Answer 1

在准确调试并尝试渲染的上下文大小后，结果发现它与内存有关。解决方案是将上下文的大小限制为最大2048宽度和1024高度

使用石英为CALayer绘制内容时出现严重崩溃

1 个答案: