I did it like this. Hope this helps
<View style={styles.hairline} />
<Text style={styles.loginButtonBelowText1}>OR</Text>
<View style={styles.hairline} />
for style:
hairline: {
backgroundColor: '#A2A2A2',
height: 2,
width: 165
},
loginButtonBelowText1: {
fontFamily: 'AvenirNext-Bold',
fontSize: 14,
paddingHorizontal: 5,
alignSelf: 'center',
color: '#A2A2A2'
},