A pure React Native Component for circular progress bars for iOS.

1. Install library npm i --save react-native-progress-circular
2. Include in your project var CircularProgressDisplay = require('react-native-progress-circular');

As of react-native 0.17:
      Due to react-native not yet supporting individual corner radius properties on android, support is lacking.

'use strict';
var React = require('react-native');
var CircularProgressDisplay = require('react-native-progress-circular');
var {View, Text} = React;

module.exports = React.createClass({
  getInitialState(){

    return { progress:0};
  },
  componentDidMount(){
    // automatically increment the progress
    var time = 150;
    var count = 0;
    setInterval(() => {
      if (++count < 15){
        return;
      }
      var progress = this.state.progress + Math.round((Math.random() * 4));
      if (progress >100) {
        progress = 0;
        count = 0;
      }
      this.setState({progress: progress});
    }, time);
  },
  render() {
    var progress = this.state.progress;
    // displayed inside of the component
    var innerDisplay = (
      <View style={{width: 200, height: 200, flex:1, justifyContent: 'center',
      alignItems: 'center', backgroundColor: '#036282'}}>
        <Text style={{fontSize: 30}}>{progress + "%"}</Text>
      </View>
    );

    return (<View style={{backgroundColor: 'orange',flex:1, flexDirection: 'row'}}>
      <View style={{ flex: 1, top:200, left: 20}}>
        <CircularProgressDisplay.Hollow size={200}
        progressBarWidth={20} outlineWidth={0} outlineColor={'black'}
        backgroundColor={'orange'} progressBarColor={'#02BAF7'}
        innerComponent={innerDisplay} rotate={((progress/100)*360)}/>
      </View>
    </View>);

  }
});

• size (Number:ReactComponent) - The size of the component. The resulting components height and width are equal
• progressBarWidth (Integer) - The width of the circular progress bar.
• progressBarColor (String) - The color of the progress bar.
• backgroundColor (String) - The color of the center of the component and the zero progress area.
• outlineWidth (Integer) - If this prop is present, the resulting component has a round border of this width.
• outlineColor (String) - The color of the border outlining the component.
• rotate (Integer) - The current progress to track specified in degrees. E.G. 270. Can take a value between 0 and 360, inclusive.
• innerComponent (ReactComponent) - A component to display inside of the round hollow progress bar. Can be used display an inner progress bar, or track the current progress with a <Text> component.

• size (Number:ReactComponent) - The size of the component. The resulting components height and width are equal
• rotate (Integer) - The current progress to track specified in degrees. E.G. 270. Can take a value between 0 and 360, inclusive.
• backgroundColor (String) - The color of the center of the component and the zero progress area. This is the color of the component when no progress has been made.
• progressBarColor (String) - The color of the progress bar. This is the color when progress has been made.

MIT Licensed