selectedStyle don't work.

selectedStyle don't work.
Follow is my code,i set the text color red,but it does not work,selectedIconStyle is work fine:
````
this.setState({page:el.props.name})}
selectedIconStyle={styles.selectedIconStyle}
style={{top:0,height:tabHeight}}
>
日
周
月
年

````
````
selectedStyle:{
color:'red',
fontSize:12
},
selectedIconStyle:{
borderBottomWidth:2,
borderBottomColor:'red',
color:'red',
height:tabHeight,
// backgroundColor:'rgba(135,205,250,0.5)'
},
````
````
"react": "16.0.0-alpha.12",
"react-native": "0.45.1",
"react-native-tabs": "^1.0.9",
````