Center react native view - css

Question

I'm creating a component to show the flag and country name. I'll like that view (image + text) centered in the available space.
So if the width of parent is all the screen, there will be space in the left and same in the right. If the parent is only 50% of the screen will be then left space on the sides...
What I've done:
<View style={styles.mainContainer} >
<View >
<TouchableOpacity
disabled={this.props.disablePicker}
onPress={() => this.setState({ modalVisible: true, dataSource: this.props.dataSource })}
activeOpacity={0.7}
>
<View>
<View style={[pickerStyle,{ flexDirection:'row'}]} >
<Image style={{}} source={selectedLabel.image} />
<Text style={}>{selectedLabel.name}</Text>
{dropDownImage ? <Image
style={dropDownImageStyle}
resizeMode="contain"
source={dropDownImage}
/> : null}
</View>
</View>
</TouchableOpacity>
</View>
</View>
const CountryPickerStyles = StyleSheet.create({
container: {
flex: 1,
alignItems: "center",
justifyContent: "center"
},
itemSeparatorStyle:{
height: 1,
width: "90%",
alignSelf: "center",
backgroundColor: "#D3D3D3"
},
searchBarContainerStyle: {
marginBottom: 10,
flexDirection: "row",
height: 40,
shadowOpacity: 1.0,
shadowRadius: 5,
shadowOffset: {
width: 1,
height: 1
},
backgroundColor: "rgba(255,255,255,1)",
shadowColor: "#d3d3d3",
borderRadius: 10,
elevation: 3,
marginLeft: 10,
marginRight: 10
},
selectLabelTextStyle: {
color: "#000",
fontSize:16,
flexDirection: "row",
marginLeft: 100,
marginRight: 100
},
placeHolderTextStyle: {
color: "#757575",
padding: 10,
textAlign: "left",
width: "99%",
fontStyle: 'italic',
fontSize:12,
flexDirection: "row"
},
dropDownImageStyle: {
marginLeft: 10,
color: "#757575",
width: 10,
height: 10,
alignSelf: "center"
},
listTextViewStyle: {
color: "#000",
alignItems: "center",
justifyContent: "center",
marginLeft: 20,
marginHorizontal: 10,
textAlign: "left"
},
pickerStyle: {
elevation:0,
paddingRight: 10,
paddingLeft: 10,
marginRight: 10,
marginLeft: 10,
width:"90%",
borderWidth:0 ,
flexDirection: "row"
}
});
here's what I got:
https://pasteboard.co/JG5Rx9P.png
and also https://pasteboard.co/JG5Tthie.png