本文实现Photos.framework的常见功能，包括：创建自定义相册、保存图片到自定义相册、搜索所有相册的图片，具体内容如下
1、保存图片到相册

/** * 保存图片到相册 */- (IBAction)saveImage { PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus]; if (status == PHAuthorizationStatusDenied) { NSLog(@"请到【设置-隐私-照片】打开访问开关"); } else if (status == PHAuthorizationStatusRestricted) { NSLog(@"无法访问相册"); } else { // 保存相片的标识 __block NSString *assetId = nil; [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{ // 保存相片到相机胶卷，并返回标识 assetId = [PHAssetCreationRequest creationRequestForAssetFromImage:[UIImage imageNamed:@"logo"]].placeholderForCreatedAsset.localIdentifier; } completionHandler:^(BOOL success, NSError * _Nullable error) { if (!success) { NSLog(@"保存失败：%@", error); return; } // 根据标识获得相片对象 PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetId] options:nil].lastObject; // 拿到自定义的相册对象 PHAssetCollection *collection = [self collection]; if (collection == nil) return; // 保存相片到自定义相册中 [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{ [[PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection] addAssets:@[asset]]; } completionHandler:^(BOOL success, NSError * _Nullable error) { if (success) { NSLog(@"保存成功"); } else { NSLog(@"保存失败：%@", error); } }]; }]; }}

2、搜索所有相片

/** * 查询所有的图片 */- (IBAction)searchAllImages { // 遍历所有的自定义相册 PHFetchResult<PHAssetCollection *> *collectionResult0 = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil]; for (PHAssetCollection *collection in collectionResult0) { [self searchAllImagesInCollection:collection]; } // 获得相机胶卷的图片 PHFetchResult<PHAssetCollection *> *collectionResult1 = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeSmartAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil]; for (PHAssetCollection *collection in collectionResult1) { if (![collection.localizedTitle isEqualToString:@"Camera Roll"]) continue; [self searchAllImagesInCollection:collection]; break; }} /** * 查询某个相册里面的所有图片 */- (void)searchAllImagesInCollection:(PHAssetCollection *)collection{ // 采取同步获取图片（只获得一次图片） PHImageRequestOptions *imageOptions = [[PHImageRequestOptions alloc] init]; imageOptions.synchronous = YES; NSLog(@"相册名字：%@", collection.localizedTitle); // 遍历这个相册中的所有图片 PHFetchResult<PHAsset *> *assetResult = [PHAsset fetchAssetsInAssetCollection:collection options:nil]; for (PHAsset *asset in assetResult) { // 过滤非图片 if (asset.mediaType != PHAssetMediaTypeImage) continue; // 图片原尺寸 CGSize targetSize = CGSizeMake(asset.pixelWidth, asset.pixelHeight); // 请求图片 [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:targetSize contentMode:PHImageContentModeDefault options:imageOptions resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) { NSLog(@"图片：%@", result); }]; }}

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