objective-c - CIDetector没有释放内存

我多次使用CIDetector，如下所示:

    -(NSArray *)detect:(UIImage *)inimage
    {
        UIImage *inputimage = inimage;
        UIImageOrientation exifOrientation = inimage.imageOrientation;
        NSNumber *orientation = [NSNumber numberWithInt:exifOrientation];

        NSDictionary *imageOptions = [NSDictionary dictionaryWithObject:orientation forKey:CIDetectorImageOrientation];
        CIImage* ciimage = [CIImage imageWithCGImage:inputimage.CGImage options:imageOptions];


        NSDictionary *detectorOptions = [NSDictionary dictionaryWithObject:orientation forKey:CIDetectorImageOrientation];

        NSArray* features = [self.detector featuresInImage:ciimage options:detectorOptions];

        if (features.count == 0)
        {
            PXLog(@"no face found");
        }

        ciimage = nil;
        NSMutableArray *returnArray = [NSMutableArray new];


        for(CIFaceFeature *feature in features)
        {
            CGRect rect = feature.bounds;
            CGRect r = CGRectMake(rect.origin.x,inputimage.size.height - rect.origin.y - rect.size.height,rect.size.width,rect.size.height);

            FaceFeatures * ff = [[FaceFeatures new] initWithLeftEye:CGPointMake(feature.leftEyePosition.x, inputimage.size.height - feature.leftEyePosition.y )
                                                           rightEye:CGPointMake(feature.rightEyePosition.x, inputimage.size.height - feature.rightEyePosition.y )
                                                              mouth:CGPointMake(feature.mouthPosition.x, inputimage.size.height - feature.mouthPosition.y )];

            Face *ob = [[Face new] initFaceInRect:r withFaceFeatures:ff] ;


            [returnArray addObject:ob];
        }

        features = nil;
        return returnArray;
    }

-(CIContext*) context{
    if(!_context){
        _context = [CIContext contextWithOptions:nil];
    }
    return _context;
}
-(CIDetector *)detector
{
    if (!_detector)
    {
        // 1 for high 0 for low
#warning not checking for fast/slow detection operation
        NSString *str = @"fast";//[SettingsFunctions retrieveFromUserDefaults:@"face_detection_accuracy"];


        if ([str isEqualToString:@"slow"])
        {
            //DDLogInfo(@"faceDetection: -I- Setting accuracy to high");
            _detector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil
                                           options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh forKey:CIDetectorAccuracy]];
        } else {
            //DDLogInfo(@"faceDetection: -I- Setting accuracy to low");
            _detector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil
                                           options:[NSDictionary dictionaryWithObject:CIDetectorAccuracyLow forKey:CIDetectorAccuracy]];
        }

    }
    return _detector;
}

但是在遇到各种内存问题后，根据《乐器》，它似乎没有发布NSArray* features = [self.detector featuresInImage:ciimage options:detectorOptions];
我的代码中是否存在内存泄漏？

最佳答案

我遇到了相同的问题，并且重用CIDetector似乎是一个错误(或者出于缓存目的，可能是设计错误)。

通过不重复使用CIDetector，而是根据需要实例化一个实例，然后在检测完成后将其释放(或使用ARC术语，就是不保留引用)，可以解决该问题。这样做有一定的成本，但是如果您按照您所说的在后台线程上进行检测，那么与无限制的内存增长相比，该成本可能是值得的。

也许更好的解决方案是，如果您连续检测多个图像，则创建一个检测器，然后将其全部使用(或者，如果增长太大，则每N张图像释放并创建一个新检测器。)必须尝试看看N应该是什么)。

我已向Apple提交了有关此问题的Radar错误:http://openradar.appspot.com/radar?id=6645353252126720

关于objective-c - CIDetector没有释放内存，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/19156330/