将照片保存到 iPhone 照片库中的自定义相册

我正在尝试在 iPhone 的照片库中创建一个自定义相册，然后将我用相机拍摄的照片或从手机相机胶卷中选择的照片保存到该自定义相册中。我可以成功创建相册，但照片没有保存在那里，而是保存到模拟器的“已保存照片”相册中...我不知道如何判断UIImageWriteToSavedPhotosAlbum保存到我刚刚使用创建的新相册addAssetsGroupAlbumWithName...

这是我到目前为止的代码 - 我剪掉了一些部分以保持我的代码示例简短......

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{     
  NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
  if([mediaType isEqualToString:(__bridge NSString *)kUTTypeImage])
  {        
    // pull GPS information from photos metadata using ALAssetsLibrary
    void (^ALAssetsLibraryAssetForURLResultBlock)(ALAsset *) = ^(ALAsset *asset)
    {
        // code snipped out 
    };
    NSURL *assetURL = [info objectForKey:UIImagePickerControllerReferenceURL];
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    [library assetForURL:assetURL
             resultBlock:ALAssetsLibraryAssetForURLResultBlock
            failureBlock:^(NSError *error) 
            {
                // code snipped out
            }];

    // getimage from imagePicker and resize it to the max size of the iPhone screen 
    UIImage *originalImage = [info objectForKey:UIImagePickerControllerOriginalImage]; 
    UIImage *resizedImage = [util_ createThumbnailForImage:originalImage thumbnailSize:[util_ determineIPhoneScreenSize]];
    NSData *imageData = UIImagePNGRepresentation(resizedImage);

                // code snipped out
                // code snipped out
                // code snipped out
                // code snipped out
                // code snipped out
                // code snipped out



    // create a new album called "My Apps Photos"
    [library addAssetsGroupAlbumWithName:@"My Apps Photos"
            resultBlock:^(ALAssetsGroup *group) 
            {
                NSLog(@"in addAssetsGroupAlbumWithName resultBlock");

                // save file to album
                UIImageWriteToSavedPhotosAlbum(resizedImage, self, nil, nil);

            } 
            failureBlock:^(NSError *error) 
            {
                NSLog(@"in addAssetsGroupAlbumWithName failureBlock");

            }
     ];
  }
}

所以...就像我说的，它会创建新相册，但不会将照片保存在那里。我如何告诉它保存到新相册中？也许我听起来不太用UIImageWriteToSavedPhotosAlbum??

注意：我使用的是 Xcode 4.3.2、IOS 5.1 和 ARC

如果您使用的是 iOS 6，Fernando 的答案将不起作用，因为保存图像选择器不再可用。

这个过程相当混乱，而且我还没有看到任何明确的答案，所以这里是我在 iOS6 中用来解决这个问题的方法。

您将需要使用以下各项的组合：

创建相册：

[self.library addAssetsGroupAlbumWithName:albumName 
                              resultBlock:^(ALAssetsGroup *group) {
         NSLog(@"added album:%@", albumName);
}
                             failureBlock:^(NSError *error) {
         NSLog(@"error adding album");
}];

找到专辑：

__block ALAssetsGroup* groupToAddTo;
[self.library enumerateGroupsWithTypes:ALAssetsGroupAlbum
                             usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
      if ([[group valueForProperty:ALAssetsGroupPropertyName] isEqualToString:albumName]) {
          NSLog(@"found album %@", albumName);
          groupToAddTo = group;
      }
}
                           failureBlock:^(NSError* error) {
     NSLog(@"failed to enumerate albums:\nError: %@", [error localizedDescription]);
}];

将图片保存到资源库，并放入相册：

CGImageRef img = [image CGImage];
[self.library writeImageToSavedPhotosAlbum:img
                                  metadata:[info objectForKey:UIImagePickerControllerMediaMetadata]
                           completionBlock:^(NSURL* assetURL, NSError* error) {
     if (error.code == 0) {
         NSLog(@"saved image completed:\nurl: %@", assetURL);

         // try to get the asset
         [self.library assetForURL:assetURL
                       resultBlock:^(ALAsset *asset) {
              // assign the photo to the album
              [groupToAddTo addAsset:asset];
              NSLog(@"Added %@ to %@", [[asset defaultRepresentation] filename], albumName);
          }
                      failureBlock:^(NSError* error) {
              NSLog(@"failed to retrieve image asset:\nError: %@ ", [error localizedDescription]);
          }];
     }
     else {
         NSLog(@"saved image failed.\nerror code %i\n%@", error.code, [error localizedDescription]);
     }
 }];