Nimbus NIToolbarPhotoViewController Image Crisping Effect

Question

I'm using Nimbus to display a photo album with scrubber and zoomable image view. I use network images, and display a thumbnail until the final image is loaded. NIPhotoAlbumScrollView provides the method didLoadPhoto:atIndex:photoSize: to accomplish exactly that.

From the source code comments, the NIPhotoScrollView should support that "image crisping effect" - showing thumbnail and when full-size image is loaded, sharpen the image without loosing the zoom state.

This feature seems broken though. When the thumbnail is loaded, it is displayed in its 1:1 pixel size, which is very small on screen. When the full-size image is loaded, it is also loaded in its 1:1 pixel size (if smaller than the available view size), which makes the image visually jump bigger.

Any idea on how to fix that issue?

Note that I tried both with a full sized image with dimensions bigger or smaller than the size of the NIToolbarPhotoViewController on screen.

Answer 1

you may already be doing this, but one thing to make certain:

where you implement photoAlbumScrollView:photoAtIndex:photoSize:isLoading:originalPhotoDimensions: for protocol NIPhotoAlbumScrollViewDataSource, you must do the following, as mentioned in these comments in the source:

 * If you have a thumbnail in memory but not the full-size image yet, then you should return
 * the thumbnail, set isLoading to YES, and set photoSize to NIPhotoScrollViewPhotoSizeThumbnail.