使用swift

Question

我使用AVFoundation创建了一个自定义相机，现在在捕获图像之后，需要将其保存在iPhone的图库中。

我尝试用UIImageWriteToSavedPhotosAlbum保存图像，但是发现它不保存EXIF信息。

Answer 1

要保存带有图像的EXIF信息，请参考以下代码。

    - (void)saveImageDataToPhotoAlbum:(NSData *)originalData  
{  
    NSDictionary *dataDic = [self getDataAndMetadata:originalData];  

    ALAssetsLibrary *assetsLib = [[ALAssetsLibrary alloc] init];  
    [assetsLib writeImageDataToSavedPhotosAlbum:dataDic[@"data"]  
                                       metadata:dataDic[@"metadata"]  
                                completionBlock:^(NSURL *url, NSError *e) {  
                                    [self addToMyAlbum:url];  
                                }];  
}  
- (NSDictionary *)getDataAndMetadata:(NSData *)originalData  
{  
    CGImageSourceRef cimage = CGImageSourceCreateWithData((CFDataRef)originalData, nil);  
    NSDictionary *metadata = (NSDictionary *)CGImageSourceCopyPropertiesAtIndex(cimage, 0, nil);  

    NSMutableDictionary *metadataAsMutable = [NSMutableDictionary dictionaryWithDictionary:metadata];  
    metadataAsMutable[(NSString *)kCGImagePropertyGPSDictionary] = self.myGpsDic;  

    NSMutableData *dataForMetadataRemoval = [NSMutableData data];  
    CGImageDestinationRef dest =  
    CGImageDestinationCreateWithData((CFMutableDataRef)dataForMetadataRemoval, CGImageSourceGetType(cimage), 1, nil);  
    CGImageDestinationAddImageFromSource(dest, cimage, 0, (CFDictionaryRef)metadataAsMutable);  
    CGImageDestinationFinalize(dest);  
    CFRelease(dest);  
    [metadata release];  
    CFRelease(cimage);  

    return @{ @"data" : (dataForMetadataRemoval), @"metadata" : metadataAsMutable};  
}  
 return metadataAsMutable;   
}