Awesome

react-native-dial

This package powers Yeti Smart Home and is used in production.

A react native reusable and efficient dial knob element.

import { Dial } from 'react-native-dial'
// ...
<Dial 
   initialRadius={brightness * DIF_RADIUS / 100 + MIN_RADIUS}
   radiusMax={MAX_RADIUS}
   radiusMin={MIN_RADIUS}
   onPress={() => this.toggle()}
   responderStyle={styles.responderStyle}
   wrapperStyle={styles.wheelWrapper}
   onValueChange={(a, r) => this.changeBrightness(r)} />

Some properties:

<Dial
 fixed // disallows angle updates
 elastic // allows scaling the element
 initialAngle={Number}
 initialRadius={Number}
 radiusMax={Number}
 radiusMin={Number}
 responderStyle={ReactNative.Styles}
 wrapperStyle={ReactNative.Styles}
 >
 {/* 
   Optionally you can pass children so it renders a different component of your choice as a Dial,
   that can change in scale and angle
 */}
   <YourCustomDial />
 </Dial>

More documentation is incoming, in the meanwhile please read the source code. It is a single file! PRs and issues are more than welcome.