CIImage 内存泄漏

Question

我正在使用以下方法来模糊一些图像。 使用仪器CIImage正在泄漏。 我试着把它们包在@autoreleasepool里，但没有运气。 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

我看到您在分析代码时看到的相同泄漏。试试这个，这似乎可以避免泄漏并给你相同的结果：

- (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

你是否试图让 CIImages 归零？

-(UIImage *)blurImage:(UIImage *)image withStrength:(float)strength
{      
       //your code
       CGImageRelease(cgImage);
       cropped=nil;
       result = nil;
       inputImage = nil;
       context = nil;
       return returnImage;
     }
 }