renderUsernameView

App.js

renderUsernameView(){
  return(
    <View style={ styles.container }>
      <View style={ styles.textInputContainer }>
        <TextInput
          style={styles.textInput}
          placeholder={'Username'}
          onChangeText={(username) => this.setState({username})}
          underlineColorAndroid={'transparent'}
          value={this.state.text}
        />
      </View>
      <TouchableOpacity onPress={ this.start } style={styles.button}>
        <Text style={ styles.buttonText }>
          Lets Start!
        </Text>
      </TouchableOpacity>
    </View>
  )
}