我可以将 Photo Sphere XMP Metadata添加到equirectangular照片.
我将带有XMP元数据的照片上传到Google相册,Google照片可以被识别为球形照片.
然后,我尝试将带有XMP元数据的照片保存到相机胶卷.
我通过相机胶卷将照片分享给Google相册,但Google相册并不知道这是一张球形照片.
我试图下载照片并对其进行分析,发现XMP元数据全部消失了.
当照片保存到相机胶卷时,iOS似乎会编辑元数据.
有没有办法保存照片的XMP元数据,同时将其保存到相机胶卷？

// raw jpg data to NSData
NSString *img = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"equirectangular_orig.jpg"];
NSData* imgData = [[NSFileManager defaultManager] contentsAtPath:img];
NSMutableData *newImgData = [NSMutableData dataWithData:imgData];

// writing XMP Metadata to newImgData
// ...
// ...

// saving the newImgData to new jpg file
NSString *path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"equirectangular_xmp.jpg"];
NSURL *url = [NSURL fileURLWithPath:path];
[[NSFileManager defaultManager] removeItemAtPath:[url absoluteString] error:nil];
[newImgData writeToURL:url atomically:YES];

// saving the new jpg file to camera roll
UIImage *newImg = [UIImage imageWithData:newImgData];
UIImageWriteToSavedPhotosAlbum(newImg,self,nil,nil);

[PHAssetChangeRequest creationRequestForAssetFromImageAtFileURL: url]

[PHAssetChangeRequest creationRequestForAssetFromImage:image]