How to integrate paypal into your IOS app using swift?

Does Apple anywhere publish usage statistics of their OS versions (I.e how many are using iOS 5.X, or 4, or still 3Gs and below)? It is a significant info to be known by App publishers to decide on their Target market, any ideas?

• Business Case: You are an App developer, you know the advantages of Storyboard and want to use it in your App, but storyboard only works on iOS 5 or later - a common perception says that "most must have upgraded" to iOS 5, Fine! But what about people using iPhone 3s, do they still exist? If they do, then are they your target market (i.e students could be!) then what to do, older XIBs or storyboard...but Apple doesn't publish such information, though it is really important. Any Apple guys to comment on this?

• Answer:

  Apple don't publish this data. But plenty of people gather it. From this chart, there are more people using 6.0 than 3.x Phone contracts typically 2 years and then people get a new shiny phone. Which mean that there are surprisingly few devices older than 24 months in usage. I'd also suspect that the more out-of-date the OS is, the less likely the user is to actually spend money on software. *data found in this article http://9to5mac.com/2012/05/15/developers-begin-seeing-ios-6-hits-in-app-store-application-usage-logs/