Change color of Switch while turning OFF react-native

I've design switch with platform specific, also used border based on On Off status.

<Switch
trackColor={{ true: '#7ab8e1', false: Platform.OS=='android'?'#d3d3d3':'#fbfbfb'  }}
thumbColor={[Platform.OS=='ios'?'#FFFFFF':(item.status ?'#7ab8e1':'#ffffff')]}
ios_backgroundColor="#fbfbfb"
style={[item.status ?inline_styles.switchEnableBorder:inline_styles.switchDisableBorder]}
value={item.status}
onValueChange={() =>this.change_status(index)            }
/>

Inline border Style

const inline_styles = StyleSheet.create({
switchEnableBorder: {
borderColor: '#6fa6d3',
borderWidth: 1},

switchDisableBorder: {
borderColor: '#f2f2f2',
borderWidth: 1,  },});

Android OutPut : iOS Output :

Just add:

style={{backgroundColor: '#FF0000', borderRadius: 17}}

To the Switch

onTintColor has been deprecated try the following.

  <Switch 
      trackColor={{true: 'red', false: 'grey'}}
      onValueChange={this.toggleSwitch}
      value={true}/>

this works