I saw an iPhone application which had a download button to download books within the application itself. I want to know how to download books or something else from within an iPhone app. Does anyone know of a tutorial or link about this? Please help me. Thanks in advance.
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The program you are referring to is most likely using an In App Purchase. Apple describes this exact scenario in the In App Purchase documentation:
You can read more about In App Purchases in Apple’s In App Purchase Programming Guide. There are several third party guides floating around the web as well, if Apple’s documentation is not sufficient.