If you have been using the iBooks app on your iPhone or iPad, you will have realized that the application offers a great interface with intuitive controls to read digital books on the go. Now, since many of us might also need to read PDF documents over iBooks, the iBooks app also provides a ‘Quick Look‘ functionality to open and read PDF documents from the iBooks interface.
However, it is also possible to set iBooks as your default app to open PDF documents with. To enable this, launch your iBooks app and if you have PDF documents already saved, you will see the Books/PDF tabs available on top of the application. Here, tap and hold the PDF button. A message will pop-up asking you to take a ‘Quick Look‘ or ‘Open in iBooks‘. Tap the second option. Moving forward, all your PDF documents will open on iBooks.