本文完成Photos.framework的罕見功效，包含：創立自界說相冊、保留圖片到自界說相冊、搜刮一切相冊的圖片，詳細內容以下
1、保留圖片到相冊

/**
 * 保留圖片到相冊
 */
- (IBAction)saveImage {
  PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
  if (status == PHAuthorizationStatusDenied) {
    NSLog(@"請到【設置-隱私-照片】翻開拜訪開關");
  } else if (status == PHAuthorizationStatusRestricted) {
    NSLog(@"沒法拜訪相冊");
  } else {
    // 保留相片的標識
    __block NSString *assetId = nil;
       
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
      // 保留相片到相機菲林，並前往標識
      assetId = [PHAssetCreationRequest creationRequestForAssetFromImage:[UIImage imageNamed:@"logo"]].placeholderForCreatedAsset.localIdentifier;
    } completionHandler:^(BOOL success, NSError * _Nullable error) {
      if (!success) {
        NSLog(@"保留掉敗：%@", error);
        return;
      }
         
      // 依據標識取得相片對象
      PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetId] options:nil].lastObject;
         
      // 拿到自界說的相冊對象
      PHAssetCollection *collection = [self collection];
      if (collection == nil) return;
         
      // 保留相片到自界說相冊中
      [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        [[PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection] addAssets:@[asset]];
      } completionHandler:^(BOOL success, NSError * _Nullable error) {
        if (success) {
          NSLog(@"保留勝利");
        } else {
          NSLog(@"保留掉敗：%@", error);
        }
      }];
    }];
  }
}

2、搜刮一切相片

/**
 * 查詢一切的圖片
 */
- (IBAction)searchAllImages {
     
  // 遍歷一切的自界說相冊
  PHFetchResult<PHAssetCollection *> *collectionResult0 = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
  for (PHAssetCollection *collection in collectionResult0) {
    [self searchAllImagesInCollection:collection];
  }
     
  // 取得相機菲林的圖片
  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;
  }
}
   
/**
 * 查詢某個相冊外面的一切圖片
 */
- (void)searchAllImagesInCollection:(PHAssetCollection *)collection
{
  // 采用同步獲得圖片（只取得一次圖片）
  PHImageRequestOptions *imageOptions = [[PHImageRequestOptions alloc] init];
  imageOptions.synchronous = YES;
     
  NSLog(@"相冊名字：%@", collection.localizedTitle);
     
  // 遍歷這個相冊中的一切圖片
  PHFetchResult<PHAsset *> *assetResult = [PHAsset fetchAssetsInAssetCollection:collection options:nil];
  for (PHAsset *asset in assetResult) {
    // 過濾非圖片
    if (asset.mediaType != PHAssetMediaTypeImage) continue;
       
    // 圖片原尺寸
    CGSize targetSize = CGSizeMake(asset.pixelWidth, asset.pixelHeight);
    // 要求圖片
    [[PHImageManager defaultManager] requestImageForAsset:asset targetSize:targetSize contentMode:PHImageContentModedefault options:imageOptions resultHandler:^(UIImage * _Nullable result, NSDictionary * _Nullable info) {
      NSLog(@"圖片：%@", result);
    }];
  }
}

以上就是本文的全體內容，願望對年夜家的進修有所贊助。

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