Memory imageWithCGImage使应用程序崩溃

我的项目是自动引用计数，但当我使用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：

(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;
}

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;

[16G，iPad2，视网膜]

代码：

(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;
}

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;

呼叫方：

(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;
}

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;

与

[UIImage imageWithCGImage:cgImage ....];

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

---

错误消失了！但是后来功能改变了，不能满足原来的需求

您是否尝试添加baseImg=nil；到你的回路？我试过了，没用！baseImg=零；应该在循环内。我更改了调用者，baseImg定义现在在循环外，因此baseImg=nil；不能在循环内。