Here’s an open source example pdf reader app providing a full featured book reader style experience called GreatReader from Shohei Miyamoto.
The features of GreatReader include:
- iPhone/iPad Support
- iBooks Like Design
- Zooming in/out with double tap
- Rotation handling
- Reading histories view
- Cropping for zooming
- Document Outlines
You can download GreatReader on the App Store.
You can find the GreatReader source code on Github here.