iOS 为我的函数提供 EXC_BAD_ACCESS

Question

我写了一个小函数来缩放 2 倍。但当我运行它时，它给出了 EXC_BAD_ACCESS 错误。下面是代码

- (CGImageRef)CGImageScale2x:(CGImageRef)imgRef
{
    CGFloat width = CGImageGetWidth(imgRef);
    CGFloat height = CGImageGetHeight(imgRef);

    CGRect imgRect = CGRectMake(0, 0, width, height);
    CGAffineTransform transform = CGAffineTransformMakeScale(2.0, 2.0);
    CGRect scaledRect = CGRectApplyAffineTransform(imgRect, transform);

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef bmContext = CGBitmapContextCreate(NULL,
                                                   scaledRect.size.width,
                                                   scaledRect.size.height,
                                                   8,
                                                   0,
                                                   colorSpace,
                                                   kCGImageAlphaPremultipliedFirst);
    CGContextSetAllowsAntialiasing(bmContext, FALSE);
    CGContextSetInterpolationQuality(bmContext, kCGInterpolationNone);
    CGColorSpaceRelease(colorSpace);
    CGContextScaleCTM(bmContext, 2.0, 2.0);
    CGContextDrawImage(bmContext, CGRectMake(0, 0,
                                             scaledRect.size.width,
                                             scaledRect.size.height),
                       imgRef);

    CGImageRef scaledImage = CGBitmapContextCreateImage(bmContext);
    CFRelease(bmContext);
    [(id)scaledImage autorelease];

    return scaledImage;
}

我是 iOS 新手。请帮忙。

谢谢

Answer 1

CGImageRef 无法自动释放，它是 Core Foundation 类型。尝试改用CGImageRelease(scaledImage)。