I have just uploaded APViewer 1.2.4 to AppStore, waiting for approval. It is now compatible with iOS7.
I have added a few minor functions:
Select/deselect all during edit mode
Show/hide image name
Fixed the issue (I think...) when you are scrolling and rotating, the image would go into some other pages.
I have tried to improve the performance and memory problem. It should be slightly better now.