仪器指示内存泄漏对NSMutableDictionary的实例化

找到内存泄漏并不是我的强项，但在我看来，仪器正在为NSMutableDictionary创建和设置值时指示内存泄漏。（我正在使用ARC）。这对我来说没有任何意义，希望有人可能知道实际发生的事情。仪器指示内存泄漏对NSMutableDictionary的实例化

我有一个委托方法，它是在完成使用设备相机拍摄照片时调用的：（我为引发问题的行添加了注释）。

- (void)finishImageCaptureForBuffer:(CMSampleBufferRef)imageDataSampleBuffer withError:(NSError *)error shouldSave:(BOOL)save 
{ //do some stuff... 

if (save) { 
    CFDictionaryRef attachments = CMCopyDictionaryOfAttachments(kCFAllocatorDefault, 
                   self.imageDataSampleBuffer, 
                   kCMAttachmentMode_ShouldPropagate); 
    CFMutableDictionaryRef mutableAttachments = CFDictionaryCreateMutableCopy(NULL, 0, attachments); 

    //MEMORY LEAK!!!!!// 
    NSMutableDictionary *gps = [NSMutableDictionary dictionary]; 

    CLLocation *location = [manager location]; 
    [gps setObject:@"" forKey:(NSString *)kCGImagePropertyGPSVersion]; 

    NSDateFormatter *formatter = [[NSDateFormatter alloc] init]; 
    [formatter setDateFormat:@"HH:mm:ss.SSSSSS"]; 
    [formatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]]; 

    //MEMORY LEAK!!!!!// 
    [gps setObject:ObjectOrNull([formatter stringFromDate:location.timestamp]) 
      forKey:(NSString *)kCGImagePropertyGPSTimeStamp]; 

    [gps setObject:(location.coordinate.latitude < 0) ? @"S" : @"N" 
      forKey:(NSString *)kCGImagePropertyGPSLatitudeRef]; 

    //MEMORY LEAK!!!!! 
    [gps setObject:ObjectOrNull([NSNumber numberWithDouble:fabs(location.coordinate.latitude)]) 
      forKey:(NSString *)kCGImagePropertyGPSLatitude]; 

    [gps setObject: (location.coordinate.longitude < 0) ? @"W" : @"E" 
      forKey:(NSString *)kCGImagePropertyGPSLongitudeRef]; 

    //MEMORY LEAK!!! 
    [gps setObject:ObjectOrNull([NSNumber numberWithDouble:fabs(location.coordinate.longitude)]) 
      forKey:(NSString *)kCGImagePropertyGPSLongitude]; 

    CFDictionarySetValue(mutableAttachments, kCGImagePropertyGPSDictionary, CFBridgingRetain(gps)); 

    NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:self.imageDataSampleBuffer]; 
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; 

    [library writeImageDataToSavedPhotosAlbum:imageData 
            metadata:(__bridge id)mutableAttachments 
           completionBlock:completionBlock]; 

    if ([[self delegate] respondsToSelector:@selector(captureManagerStillImageCaptured:)]) { 
     [[self delegate] captureManagerStillImageCaptured:self]; 
    } 

    CFRelease(attachments); 
    CFRelease(mutableAttachments); 
    CFRelease(self.imageDataSampleBuffer); 

} else { ...

凡objectOrNull检查，看看我们是否要插入的价值存在，如果没有，[NSNull空]被添加到字典中。

另一方面，运行iOS7而不是iOS8时出现此问题。

来源

2014-10-07 jac300

尝试用

CFDictionarySetValue(mutableAttachments, kCGImagePropertyGPSDictionary, (__bridge CFDictionaryRef)gps);

来源

2014-10-07 19:54:36 fluidsonic

由于更换

CFDictionarySetValue(mutableAttachments, kCGImagePropertyGPSDictionary, CFBridgingRetain(gps));

，这也是工作时，我把它添加到，如果statment结束：CFRelease（（__桥CFTypeRef）（GPS））; – jac300 2014-10-07 20:26:45

仪器指示内存泄漏对NSMutableDictionary的实例化

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