title: Which PHAssetCollection to use for saving an image?
body: <p>In iOS 8's Photos.framework, I'm trying to save a UIImage to the user's photo library, much in the same way you can long-press an image in Safari and choose the "Save Image". In iOS 7, this would be by just calling ALAssetLibrary's <code>writeImageToSavedPhotosAlbum:metadata:completionBlock</code>.</p>
  
  <p>For iOS 8 we need to pick an asset collection to add a PHAsset to, but I can't figure out which PHAssetCollection is closest to just saving to the user's "camera roll" (even though there isn't one, really, in iOS 8)</p>
  
  <pre><code>[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{
      PHAssetChangeRequest *newAssetRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];
      newAssetRequest.creationDate = time;
      newAssetRequest.location = location;
  
      PHObjectPlaceholder *placeholderAsset = newAssetRequest.placeholderForCreatedAsset;
  
      PHAssetCollectionChangeRequest *addAssetRequest = [PHAssetCollectionChangeRequest changeRequestForAssetCollection:WHICH_ASSET_COLLECTION];
      addAssetRequest addAssets:@[placeholderAsset];
  
  } completionHandler:^(BOOL success, NSError *error) {
      NSLog(@"Success: %d", success);
  }];
  </code></pre>
  
  <p>I tried accessing the "Recently Added" smart album, but it does not allow adding new content to it.</p>