Bugfixes: bounds checks, don't retain data source #227
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This fixes two bugs I found while rewriting the Swift example (#223):
PhotosViewController
should not retain its data source. This will lead trivially easily to retain cycles which would be difficult to manage.PhotosViewController
was asking its data source for nonsensical bounds when scrolling from the first photo. I've added a check to avoid that, and while I was there I added a check to prevent the viewer from skipping back to the first photo when the data source returnsNSNotFound
for a photo.