iPhone - How to create a custom album and give custom names to photos in camera roll programmatically?

Question

I am developing an iPhone photo application, so i need to create a separate album with a name \"My Album\" in camera roll and i need to save my UIImageView image with custom

Answer 1

/// Save images or videos（保存图片或视频）(kUTTypeImage, kUTTypeMovie)
/// Add to album if specified album name, and create album if needed
/// @params mediaArray UIImage, fileURL for a image or video
+ (void)_saveMediaArray:(NSArray *)mediaArray
                options:(LAImageSaverOptions *)options
             completion:(void (^)(NSError * _Nullable err))completion
{
    NSInteger __block count = 0;

    [PHPhotoLibrary.sharedPhotoLibrary performChanges:^{

        // Create album if needed
        PHAssetCollectionChangeRequest *assetCollectionChangeRequest = nil;
        NSMutableArray *assetChangeRequestPlaceholders = nil;
        if (options.targetAlbumName.length > 0) {
            assetChangeRequestPlaceholders = [NSMutableArray arrayWithCapacity:mediaArray.count];

            PHFetchOptions *fetchOptions = PHFetchOptions.new;
            //fetchOptions.includeAssetSourceTypes = PHAssetSourceTypeUserLibrary;
            fetchOptions.predicate = [NSPredicate predicateWithFormat:@"localizedTitle = %@", options.targetAlbumName]; // 不能用 block 形式的 predicate
            PHAssetCollection * assetCollection = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:fetchOptions].firstObject;
            if (nil == assetCollection) {
                assetCollectionChangeRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:options.targetAlbumName];
            } else {
                assetCollectionChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:assetCollection];
            }
         }

        // Save images
        for (id item in mediaArray) {
            PHAssetChangeRequest *assetChangeRequest = nil;
            // image object
            if ([item isKindOfClass:UIImage.class]) {
                UIImage *image = (UIImage *)item;
                assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
                [assetChangeRequestPlaceholders addObject:assetChangeRequest.placeholderForCreatedAsset];
                ++count;
                continue;
            }

            // file url for image or movie
            NSURL *fileURL = (NSURL *)item;
            if ([item isKindOfClass:NSURL.class] && fileURL.isFileURL) {
                NSString *extension = fileURL.pathExtension;
                if (extension.length == 0) {
                    NSLog(@"illegal fileURL(no path extension): %@", fileURL);
                    continue; // illegal file url
                }
                CFStringRef uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)extension, NULL);
                BOOL isImage = false;
                BOOL isVideo = false;
                if (nil != uti && CFStringGetLength(uti) > 0) {
                    isImage = UTTypeConformsTo(uti, kUTTypeImage);
                    isVideo = UTTypeConformsTo(uti, kUTTypeMovie); // kUTTypeVideo, kUTTypeAudiovisualContent
                }
                if (isImage) {
                    assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromImageAtFileURL:fileURL];
                    [assetChangeRequestPlaceholders addObject:assetChangeRequest.placeholderForCreatedAsset];
                    ++count;
                } if (isVideo) {
                    assetChangeRequest = [PHAssetChangeRequest creationRequestForAssetFromVideoAtFileURL:fileURL];
                    [assetChangeRequestPlaceholders addObject:assetChangeRequest.placeholderForCreatedAsset];
                    ++count;
                } else {
                    NSLog(@"illegal fileURL(neither image nor movie): %@", fileURL);
                    continue; // illegal file url
                }
            }
        }

        // add to album if needed
        [assetCollectionChangeRequest addAssets:assetChangeRequestPlaceholders];

    } completionHandler:^(BOOL success, NSError * _Nullable error) {

        // not in main thread 
        dispatch_async(dispatch_get_main_queue(), ^{
            completion(error);
        });
    }];
}

By the way, you can do more about LAImageSaverOptions

@interface LAImageSaverOptions : NSObject

/// to show alert controller on the hostVC
@property(nonatomic, weak, null_resettable) UIViewController *hostVC;


/// total progress
@property (nonatomic, strong, null_resettable) NSProgress *progress;

// album name for saving images
@property (nonatomic, copy, nullable) NSString *targetAlbumName;

@end