swift3 - How can I incorporate both iOS 9.3 & iOS 10 codes into my App? -

scenario:
have existing ios 9.3 application 5th-generation itouch can handle.
i want add ios 10-savvy code application , able filter existing code can continue working old itouch.

however, compiler refuses build if deployment target set @ ios 9.3 or lower:

there work-around or must create new application?

---

possible solution:

1. build ios 10.0+ deployment; then
2. filter via in-code @available(ios 10.0, *).

itouch can't handle ios 10; i'm hope above solution work.

you use #available

    if #available(ios 10, *) {         uiapplication.shared.open(url, options: [:], completionhandler: {             (success) in             guard success else {                 //handle error                 return             }         })     } else {         _ = uiapplication.shared.openurl(url)     } }