NIToolbarPhotoViewController with photos in app bundle

Question

Originally posted at https://groups.google.com/forum/#!msg/nimbusios/nGePpdl12N4/Etnyp1cUOhMJ

Are there any examples available using NIToolbarPhotoViewController with non-network images? I have the images in my application bundle that I would like to present through this class. I have tried a few tweaks of the NetworkPhotoAlbum example with my own subclass (subclassing NIToolbarPhotoViewController directly, not NetworkPhotoAlbumViewController). However, even when I hardcode the following two methods in my subclass to return an image using + imageNamed, I get blank screen.

- (UIImage *)photoAlbumScrollView: (NIPhotoAlbumScrollView *)photoAlbumScrollView 
                     photoAtIndex: (NSInteger)photoIndex 
                        photoSize: (NIPhotoScrollViewPhotoSize *)photoSize 
                        isLoading: (BOOL *)isLoading 
          originalPhotoDimensions: (CGSize *)originalPhotoDimensions 

- (UIImage *)photoScrubberView: (NIPhotoScrubberView *)photoScrubberView 
              thumbnailAtIndex: (NSInteger)thumbnailIndex 

Based on my current understanding, it seems that any class should be able to subclass NIToolbarPhotoViewController and implement these two methods below as a very basic start. However, even with these two datasource methods implemented as shown, I receive a blank screen. Though, I still get the view showing the correct photo count (4 of 10, for example) and can click through using the forward/back arrows, I end up with no actuall images displaying. I was expecting the default.png to show up 10 times.

- (NSInteger)numberOfPhotosInPhotoScrollView:(NIPhotoAlbumScrollView *)photoScrollView { 
  return 10; 
} 

- (UIImage *)photoAlbumScrollView: (NIPhotoAlbumScrollView *)photoAlbumScrollView 
                     photoAtIndex: (NSInteger)photoIndex 
                        photoSize: (NIPhotoScrollViewPhotoSize *)photoSize 
                        isLoading: (BOOL *)isLoading 
          originalPhotoDimensions: (CGSize *)originalPhotoDimensions { 

  return [UIImage imageWithContentsOfFile: 
     NIPathForBundleResource(nil, @"NimbusPhotos.bundle/gfx/default.png")]; 

}

Answer 1

I was having the same problem. You need to assign a value to the photoSize (and originalPhotoDimensions should also be set, but it is not essential). I would have thought that the default behavior would have been to read the properties off of the image directly, but the default is (0,0).

- (UIImage *)photoAlbumScrollView: (NIPhotoAlbumScrollView *)photoAlbumScrollView 
                 photoAtIndex: (NSInteger)photoIndex 
                    photoSize: (NIPhotoScrollViewPhotoSize *)photoSize 
                    isLoading: (BOOL *)isLoading 
      originalPhotoDimensions: (CGSize *)originalPhotoDimensions { 

 UIImage *image = [UIImage imageWithContentsOfFile: 
 NIPathForBundleResource(nil, @"NimbusPhotos.bundle/gfx/default.png")];

 *originalPhotoDimensions = [image size];
 *photoSize = NIPhotoScrollViewPhotoSizeOriginal;
 return image;}

This did the trick for me, it should for anyone else as well.