將圖片寫入系統(tǒng)相冊

/**
 保存圖片到系統(tǒng)相薄
 */
- (void)saveImageToSystemPhotoLibrary
{
    NSData *data = [NSData dataWithContentsOfURL:[NSURL  URLWithString:self.listModel.originalUrls[_currentIndex]]];
    UIImage *image = [UIImage imageWithData:data]; // 取得圖片
    
    [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
        //寫入圖片到相冊
        PHAssetChangeRequest *req = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
    } completionHandler:^(BOOL success, NSError * _Nullable error) {
        NSLog(@"success = %d, error = %@", success, error);
        if (success)
        {
            NSLog(@"=========保存圖片成功");
        }
    }];
}

將圖片寫入系統(tǒng)相冊和相薄

- (void)saveImageToPhotoLibrary
{
    NSData *data = [NSData dataWithContentsOfURL:[NSURL  URLWithString:self.listModel.originalUrls[_currentIndex]]];
    UIImage *image = [UIImage imageWithData:data]; // 取得圖片
       //保存圖片
       __block NSString *assetId = nil;
      // 1. 存儲圖片到"相機(jī)膠卷"
       [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
             // 新建一個(gè)PHAssetCreationRequest對象
             // 返回PHAsset(圖片)的字符串標(biāo)識
         assetId = [PHAssetCreationRequest creationRequestForAssetFromImage:image].placeholderForCreatedAsset.localIdentifier;
           } completionHandler:^(BOOL success, NSError * _Nullable error) {
                 // 2. 獲得相冊對象
                 PHAssetCollection *collection = [self getCollection];
                 // 3. 將“相機(jī)膠卷”中的圖片添加到新的相冊
                 [[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
                       PHAssetCollectionChangeRequest *request = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:collection];
                       NSLog(@"%@", [PHAsset fetchAssetsWithLocalIdentifiers:@[assetId] options:nil]);
                       // 根據(jù)唯一標(biāo)示獲得相片對象
                       PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:@[assetId] options:nil].firstObject;
                       // 添加圖片到相冊中
                       [request addAssets:@[asset]];
                     } completionHandler:^(BOOL success, NSError * _Nullable error) {
                           NSLog(@"成功保存到相簿：%@", collection.localizedTitle);
                          [MBProgressHUD showSuccessMessage:@"保存圖片成功"];
                     }];
        }];
}

 - (PHAssetCollection *)getCollection {
      // 先獲得之前創(chuàng)建過的相冊
      PHFetchResult<PHAssetCollection *> *collectionResult = [PHAssetCollection fetchAssetCollectionsWithType:PHAssetCollectionTypeAlbum subtype:PHAssetCollectionSubtypeAlbumRegular options:nil];
      for (PHAssetCollection *collection in collectionResult) {
            if ([collection.localizedTitle isEqualToString:@"搜緣"]) {
                   return collection;
                }
           }
    
       // 如果相冊不存在,就創(chuàng)建新的相冊(文件夾)
       __block NSString *collectionId = nil; // __block修改block外部的變量的值
      // 這個(gè)方法會在相冊創(chuàng)建完畢后才會返回
       [[PHPhotoLibrary sharedPhotoLibrary] performChangesAndWait:^{
            // 新建一個(gè)PHAssertCollectionChangeRequest對象, 用來創(chuàng)建一個(gè)新的相冊
             collectionId = [PHAssetCollectionChangeRequest creationRequestForAssetCollectionWithTitle:@"搜緣"].placeholderForCreatedAssetCollection.localIdentifier;
           } error:nil];
   
       return [PHAssetCollection fetchAssetCollectionsWithLocalIdentifiers:@[collectionId] options:nil].firstObject;
}