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我的项目是自动引用计数,但是当我使用CGBitmapContextCreateImage和UIIMage的方法imageWithCGImage时,发生了一些事情。我写了一些测试代码,当代码运行时,内存增加,直到应用程序崩溃。

设备:

【16G,iPad2,视网膜】

编码:

(UIImage*) createImageByImage:(UIImage*)img
{
    CGSize imgSize = img.size;

    imgSize.width *= [UIScreen mainScreen].scale;
    imgSize.height *= [UIScreen mainScreen].scale;

    CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB();
    CGContextRef ctx = CGBitmapContextCreate(nil, imgSize.width, imgSize.height, 8, imgSize.width * (CGColorSpaceGetNumberOfComponents(space) + 1), space, kCGImageAlphaPremultipliedLast);
    CGColorSpaceRelease(space);

    CGRect rect;
    rect.origin = CGPointMake(0, 0);
    rect.size = imgSize;

    // here bypass some transformation to the CGContext

    CGContextDrawImage(ctx, rect, img.CGImage);

    CGImageRef cgImage = CGBitmapContextCreateImage(ctx);
    CGContextRelease(ctx);

    UIImage* image = [UIImage imageWithCGImage:cgImage scale:[UIScreen mainScreen].scale orientation:UIImageOrientationDown];
    CGImageRelease(cgImage);

    return image;
}

呼叫者,召集者:

UIImage* baseImg = [UIImage imageNamed:@"corkboard.jpg"]; // any big image,e.g. 1024*768
for (int i = 0; i < 100;  i++) {
    UIImage* tempImg = [self createImageByImage:baseImg];
    tempImg = nil;
}
baseImg = nil;

有没有人可以解释一下?等待您的帮助!!!

另一件事:在代码中,如果我只替换

[UIImage imageWithCGImage:cgImage ....];

[UIImage imageWithCGImage:img.CGImage ....];

错误消失了!但是后来功能变了,不能满足原来的需求!

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