iOS 10 compatibility to iOS 9 apps : <p>I have launched my iOS app written in swift 2.2 and supports iOS 9 and watch OS 2.2 in app store.  iOS 10 is going to be released tomorrow. How will the app work on iOS 10 environment if any users upgrade to it till the app updates on iOS 10 support are pushed to app store?</p>

<p>I know swift 3 has syntax level changes in methods and a lot. Could anyone please suggest me what the best solution is ? </p>
