Top Tips for iOS 9 Development

Top tips for iOS 9 including: 3D Touch, NSLayoutAnchor, Swift 2 and more.
https://realm.io/news/tips-for-ios-9-development/

Get Your App Ready for iOS 9

iOS 9.0 brings many new things, this “how to adopt” guide deals with: new font, new SafariViewController, the App Transport Security guidelines, Swift Whole Module Optimization and the new Low Power Mode.
http://blog.curtisherbert.com/get-your-app-ready-for-ios-9/