Z ramą iOS Photos Framework, w jaki sposób wyświetlić wszystkie dostępne zbiory PHAssetCollections?

Question

Z ramą iOS Photos Framework, w jaki sposób mogę wyświetlić wszystkie dostępne zbiory PHAssetCollections? Chciałbym znaleźć kolekcję "Photo Roll", aby móc pobrać wszystkie zdjęcia z tej kolekcji. Jak to zrobić w systemie iOS 8+ za pomocą nowych PhotosFramework?

Answer 1

Jeśli spojrzeć na PhotoTypes, można zobaczyć, że rolki aparatu nie jest zawarta w PH, można się do niego dostać przez

PHFetchResult *result = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum 
                   subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary 
                   options:nil]; 
PHAssetCollection *assetCollection = result.firstObject; 
NSLog(@"%@", assetCollection.localizedTitle); // Camera Roll 

W ogóle to jak dostać wszystko

PHFetchOptions *options = [[PHFetchOptions alloc] init]; 
options.wantsIncrementalChangeDetails = YES; 
options.predicate = [NSPredicate predicateWithFormat:@"mediaType == %d",PHAssetMediaTypeImage]; 

PHFetchResult *albums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil]; 
for (PHAssetCollection *sub in albums) 
{ 
    PHFetchResult *fetchResult = [PHAsset fetchAssetsInAssetCollection:sub options:options]; 
} 

#pragma mark - PHAssetCollection types 

typedef NS_ENUM(NSInteger, PHAssetCollectionType) { 
    PHAssetCollectionTypeAlbum  = 1, 
    PHAssetCollectionTypeSmartAlbum = 2, 
    PHAssetCollectionTypeMoment  = 3, 
} NS_ENUM_AVAILABLE_IOS(8_0); 

typedef NS_ENUM(NSInteger, PHAssetCollectionSubtype) { 

// PHAssetCollectionTypeAlbum regular subtypes 
PHAssetCollectionSubtypeAlbumRegular   = 2, 
PHAssetCollectionSubtypeAlbumSyncedEvent  = 3, 
PHAssetCollectionSubtypeAlbumSyncedFaces  = 4, 
PHAssetCollectionSubtypeAlbumSyncedAlbum  = 5, 
PHAssetCollectionSubtypeAlbumImported  = 6, 

// PHAssetCollectionTypeAlbum shared subtypes 
PHAssetCollectionSubtypeAlbumMyPhotoStream = 100, 
PHAssetCollectionSubtypeAlbumCloudShared  = 101, 

// PHAssetCollectionTypeSmartAlbum subtypes 
PHAssetCollectionSubtypeSmartAlbumGeneric = 200, 
PHAssetCollectionSubtypeSmartAlbumPanoramas = 201, 
PHAssetCollectionSubtypeSmartAlbumVideos  = 202, 
PHAssetCollectionSubtypeSmartAlbumFavorites = 203, 
PHAssetCollectionSubtypeSmartAlbumTimelapses = 204, 
PHAssetCollectionSubtypeSmartAlbumAllHidden = 205, 
PHAssetCollectionSubtypeSmartAlbumRecentlyAdded = 206, 
PHAssetCollectionSubtypeSmartAlbumBursts  = 207, 
PHAssetCollectionSubtypeSmartAlbumSlomoVideos = 208, 
PHAssetCollectionSubtypeSmartAlbumUserLibrary = 209, 

// Used for fetching, if you don't care about the exact subtype 
PHAssetCollectionSubtypeAny = NSIntegerMax 
} NS_ENUM_AVAILABLE_IOS(8_0); 

Answer 2

Zastosowanie poniżej danego fragmentu kodu, aby uzyskać wszystkie inteligentne albumy i wszystkie inteligentne zdjęcia

// Get all Smart Albums 
    PHFetchResult *smartAlbums = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil]; 

[smartAlbums enumerateObjectsUsingBlock:^(PHAssetCollection *collection, NSUInteger idx, BOOL *stop) { 
    NSLog(@"album title %@", collection.localizedTitle); 
}]; 


// Get all photos 
PHFetchResult *allPhotosResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeImage options:nil]; 


// Get assets from the PHFetchResult object 
[allPhotosResult enumerateObjectsUsingBlock:^(PHAsset *asset, NSUInteger idx, BOOL *stop) { 
    NSLog(@"asset %@", asset); 
    CGSize size=CGSizeMake(90, 90); 
    PHImageManager *imageManager; 
    [imageManager requestImageForAsset:asset targetSize:size contentMode:PHImageContentModeAspectFit options:nil resultHandler:^(UIImage *result, NSDictionary *info) { 
      yourImageView.image=result; 

     }]; 
}]; 

dla odniesienia: https://developer.apple.com/library/prerelease/ios/samplecode/UsingPhotosFramework/Introduction/Intro.html