如何閱讀iCloud/iTunes同步的照片

Question

我正在開發一個應用程序，因爲我的工作是使用AssetsLibrary從照片庫訪問照片。但我現在面臨以下問題：

1. 當我嘗試訪問突發照片
2. 嘗試從iTunes/iCloud的訪問同步的照片。

所以請幫助我如何使用AssetsLibrary訪問爆裂照片和同步照片。

Answer 1

此方法適用於Photos框架。

如果你已經得到了PHAsset，您可以通過以下方式聯繫該資產的數據：

// For image 
PHImageRequestOptions *options = [PHImageRequestOptions new]; 
options.networkAccessAllowed = YES; 
options.version = PHImageRequestOptionsVersionCurrent; 
options.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat; 

//If comes from iCloud, the progressHandler will be called. 
options.progressHandler = ^(double progress, NSError *__nullable error, BOOL *stop, NSDictionary *__nullable info) { 
    NSLog(@"percent:%f, info:%@", progress, info); 
    // Handle progress 
}; 

[[PHImageManager defaultManager] requestImageDataForAsset:asset options:options resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) { 
    if (imageData) { 
     // Handle data 
    } 
}]; 


// For video 
PHVideoRequestOptions *options = [PHVideoRequestOptions new]; 
options.version = PHVideoRequestOptionsVersionCurrent; 
options.deliveryMode = PHVideoRequestOptionsDeliveryModeHighQualityFormat; 
options.progressHandler = ^(double progress, NSError * _Nullable error, BOOL * _Nonnull stop, NSDictionary * _Nullable info) { 
    NSLog(@"percent:%f, info:%@", progress, info); 
    // Handle progress 
}; 

[[PHImageManager defaultManager] requestAVAssetForVideo:asset options:options resultHandler:^(AVAsset * _Nullable asset, AVAudioMix * _Nullable audioMix, NSDictionary * _Nullable info) { 
    AVURLAsset *avurlasset = (AVURLAsset*)asset; 
    // Handle data 
}]; 

獲取資產：

PHFetchResult *userLibrary = [PHAssetCollection 
           fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum 
           subtype:PHAssetCollectionSubtypeSmartAlbumUserLibrary 
           options:nil]; 

[userLibrary enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) { 
    PHAssetCollection *assetCollection = (PHAssetCollection *)obj; 
    PHFetchResult *fetchResult = [self getFetchResultInAssetCollection:assetCollection]; 
    [fetchResult enumerateObjectsUsingBlock:^(id _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) { 
     PHAsset *asset = (PHAsset *)obj; 
     // Handle asset 
    }]; 
}]; 

-getFetchResultInAssetCollection：

-(PHFetchResult *)getFetchResultInAssetCollection:(PHAssetCollection *)assetCollection { 
    PHFetchOptions *options = [[PHFetchOptions alloc] init]; 
    // video and image 
    options.predicate = [NSPredicate predicateWithFormat:@"mediaType = %d || mediaType = %d", PHAssetMediaTypeImage, PHAssetMediaTypeVideo]; 
    // Sort by creationDate 
    options.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"creationDate" ascending:NO]]; 

    PHFetchResult *fetchResult = [PHAsset fetchAssetsInAssetCollection:assetCollection options:options]; 

    return fetchResult; 
}