Ich arbeite an einer iOS-App, in der ich eine Galerieansicht wie Instagram benötige. Ich habe Galerie-Ansicht, Kamera-Ansicht und Video-Ansicht hinzugefügt, nachdem das Bild in einem benutzerdefinierten Album von Fotos gespeichert wurde. Jetzt möchte ich diese Bilder aus einem benutzerdefinierten Album abrufen und in der Sammlungsansicht der Galerie anzeigen. Aber ich bin nicht weit davon entfernt, diese Bilder aus einem benutzerdefinierten Album abzurufen. Jede Hilfe wird geschätzt.

Bearbeiten: Ich habe die PHPhotoLibrary zum Erstellen eines benutzerdefinierten Fotoalbums hinzugefügt, bevor ich das AssetsLibrary-Framework hinzugefügt habe.

ann habe ich eine NSObject-Klasse (CustomAlbum) zum Erstellen und Verwalten des benutzerdefinierten Fotoalbums mit PHPhotoLibrary erstell

// CustomAlbum.h

#import <Foundation/Foundation.h>
#import <Photos/Photos.h>


@interface CustomAlbum : NSObject

//Creating album with given name
+(void)makeAlbumWithTitle:(NSString *)title onSuccess:(void(^)(NSString *AlbumId))onSuccess onError: (void(^)(NSError * error)) onError;

//Get the album by name
+(PHAssetCollection *)getMyAlbumWithName:(NSString*)AlbumName;

//Add a image
+(void)addNewAssetWithImage:(UIImage *)image toAlbum:(PHAssetCollection *)album onSuccess:(void(^)(NSString *ImageId))onSuccess onError: (void(^)(NSError * error)) onError;

//get the image using identifier
+ (void)getImageWithIdentifier:(NSString*)imageId onSuccess:(void(^)(UIImage *image))onSuccess onError: (void(^)(NSError * error)) onError;


@end

// CustomAlbum.m

#import "CustomAlbum.h"

@implementation CustomAlbum

#pragma mark - PHPhoto

+(void)makeAlbumWithTitle:(NSString *)title onSuccess:(void(^)(NSString *AlbumId))onSuccess onError: (void(^)(NSError * error)) onError
{
    //Check weather the album already exist or not
    if (![self getMyAlbumWithName:title]) {
        [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
            // Request editing the album.
            PHAssetCollectionChangeRequest *createAlbumRequest = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:title];

            // Get a placeholder for the new asset and add it to the album editing request.
            PHObjectPlaceholder * placeHolder = [createAlbumRequest placeholderForCreatedAssetCollection];
            if (placeHolder) {
                onSuccess(placeHolder.localIdentifier);
            }

        } completionHandler:^(BOOL success, NSError *error) {
            NSLog(@"Finished adding asset. %@", (success ? @"Success" : error));
            if (error) {
                onError(error);
            }
        }];
    }
}

+(void)addNewAssetWithImage:(UIImage *)image toAlbum:(PHAssetCollection *)album onSuccess:(void(^)(NSString *ImageId))onSuccess onError: (void(^)(NSError * error)) onError
{
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        // Request creating an asset from the image.
        PHAssetChangeRequest *createAssetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];

        // Request editing the album.
        PHAssetCollectionChangeRequest *albumChangeRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:album];

        // Get a placeholder for the new asset and add it to the album editing request.
        PHObjectPlaceholder * placeHolder = [createAssetRequest placeholderForCreatedAsset];
        [albumChangeRequest addAssets:@[ placeHolder ]];

        NSLog(@"%@",placeHolder.localIdentifier);
        if (placeHolder) {
            onSuccess(placeHolder.localIdentifier);
        }

    } completionHandler:^(BOOL success, NSError *error) {
        NSLog(@"Finished adding asset. %@", (success ? @"Success" : error));
        if (error) {
            onError(error);
        }
    }];
}


+(PHAssetCollection *)getMyAlbumWithName:(NSString*)AlbumName
{
    #if 0
    NSString * identifier = [[NSUserDefaults standardUserDefaults]objectForKey:kAlbumIdentifier];
    if (!identifier) return nil;
    PHFetchResult *assetCollections = [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[identifier]
                                                                                           options:nil];
    #else
    PHFetchResult *assetCollections = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum
                                                                               subtype:PHAssetCollectionSubtypeAlbumRegular
                                                                               options:nil];
    #endif
    NSLog(@"assetCollections.count = %lu", assetCollections.count);
    if (assetCollections.count == 0) return nil;

    __block PHAssetCollection * myAlbum;
    [assetCollections enumerateObjectsUsingBlock:^(PHAssetCollection *album, NSUInteger idx, BOOL *stop) {
        NSLog(@"album:%@", album);
        NSLog(@"album.localizedTitle:%@", album.localizedTitle);
        if ([album.localizedTitle isEqualToString:AlbumName]) {
            myAlbum = album;
            *stop = YES;
        }
    }];

    if (!myAlbum) return nil;
    return myAlbum;
}

+(NSArray *)getAssets:(PHFetchResult *)fetch
{
    __block NSMutableArray * assetArray = NSMutableArray.new;
    [fetch enumerateObjectsUsingBlock:^(PHAsset *asset, NSUInteger idx, BOOL *stop) {
        NSLog(@"asset:%@", asset);
        [assetArray addObject:asset];
    }];
    return assetArray;
}



+ (void)getImageWithIdentifier:(NSString*)imageId onSuccess:(void(^)(UIImage *image))onSuccess onError: (void(^)(NSError * error)) onError
{
    NSError *error = [[NSError alloc] init];
    PHFetchResult *assets = [PHAsset fetchAssetsWithLocalIdentifiers:@[imageId] options:nil];
    if (assets.count == 0) onError(error);

    NSArray * assetArray = [self getAssets:assets];
    PHImageManager *manager = [PHImageManager defaultManager];
    CGRect screenRect = [[UIScreen mainScreen] bounds];
    [manager requestImageForAsset:assetArray.firstObject targetSize:screenRect.size contentMode:PHImageContentModeAspectFit options:nil resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
        onSuccess(result);
    }];
}

@end

Wenden Sie diese Methode an, um ein benutzerdefiniertes Album zu erstellen und Bilder in diesem benutzerdefinierten Album zu speichern.

 // Take Image Button Method

- (void)snapButtonPressed:(UIButton *)button
{
    [self.camera capture:^(LLSimpleCamera *camera, UIImage *image,
                           NSDictionary *metadata, NSError *error)
     {
         if(!error)
         {
             NSString * info = [NSString stringWithFormat:@"Size: %@  -  Orientation: %ld", NSStringFromCGSize(image.size), (long)image.imageOrientation];

             [CustomAlbum addNewAssetWithImage:image toAlbum:[CustomAlbum getMyAlbumWithName:CSAlbum] onSuccess:^(NSString *ImageId) {
                 NSLog(@"%@",ImageId);
                 recentImg = ImageId;
             } onError:^(NSError *error) {
                 NSLog(@"probelm in saving image");
             }];
         }
         else
         {
             NSLog(@"An error has occured: %@", error);
         }
     }
          exactSeenImage:YES];
}