CIImage内存泄漏

Question

我正在使用下面的方法模糊一些图像。使用CIImage的仪器正在泄漏。我试着把它们包装在一个“自动释放池”里，但是没有运气。有什么想法吗？

-(UIImage *)blurImage:(UIImage *)image withStrength:(float)strength
{
    @autoreleasepool {
        CIContext *context = [CIContext contextWithOptions:nil];
        CIImage *inputImage = [[CIImage alloc] initWithCGImage:image.CGImage];
        CIFilter *filter = [CIFilter filterWithName:@"CIGaussianBlur"];
        [filter setValue:inputImage forKey:@"inputImage"];
        [filter setValue:[NSNumber numberWithFloat:strength] forKey:@"inputRadius"];

        CIImage *result = [filter valueForKey:kCIOutputImageKey];
        float scale =  [[UIScreen mainScreen] scale];
        CIImage *cropped=[result imageByCroppingToRect:CGRectMake(0, 0, image.size.width*scale, image.size.height*scale)];
        CGRect extent = [cropped extent];
        CGImageRef cgImage = [context createCGImage:cropped fromRect:extent];
        UIImage *returnImage = [UIImage imageWithCGImage:cgImage].copy;

        CGImageRelease(cgImage);

        return returnImage;
    }

}

Answer 1

我在分析代码时也看到了同样的漏洞。试一试，这似乎是为了避免泄漏，并给你同样的结果：

- (UIImage*)blurImage:(UIImage*)image withStrength:(float)strength
{
    @autoreleasepool {
        CIImage* inputImage = [[CIImage alloc] initWithCGImage:image.CGImage];
        CIFilter* filter = [CIFilter filterWithName:@"CIGaussianBlur"];
        [filter setValue:inputImage forKey:@"inputImage"];
        [filter setValue:[NSNumber numberWithFloat:strength] forKey:@"inputRadius"];

        CIImage* result = [filter valueForKey:kCIOutputImageKey];
        float scale = [[UIScreen mainScreen] scale];
        CIImage* cropped = [result imageByCroppingToRect:CGRectMake(0, 0, image.size.width * scale, image.size.height * scale)];

        return [[UIImage alloc] initWithCIImage:cropped];
    }
}

Answer 2

你试过把CIImages变成零吗？

-(UIImage *)blurImage:(UIImage *)image withStrength:(float)strength
{      
       //your code
       CGImageRelease(cgImage);

       cropped=nil;
       result = nil;
       inputImage = nil;
       context = nil;

       return returnImage;
     }
 }