Not printed state in React Native - react-native

Question

I'm now using React Native. Now I'm trying to print out one of states that are initialized ( for instance, showText herein ). When I recall this value in render, it doesn't show up ( blank ). The way that I recall is "{this.state.showText}". It doesn't produce any error messages.
Maybe because of the same reason, the initial value of TouchableHighlight seems to be blank. I'm completely lost here since a sample app in Facebook Github works fine within the website. Please give me any idea on this matter.
import React, { Component } from 'react';
import {
AppRegistry,
StyleSheet,
Text,
View,
Image,
ScrollView,
ListView,
TouchableHighlight,
TextInput
} from 'react-native';
class Greeting extends Component {
render() {
return (
<Text>Hello {this.props.name}! {this.props.date}~ Class can be added..{'\n'}</Text>
);
}
}
class Test1 extends Component {
constructor(props) {
super(props);
this.state = {
showText: 'true',
showTextBool: true,
wow: 'ddsdfasdf'
};
}
onSignupPress(){
return "hello";
}
render() {
let display = this.state.showTextBool ? 'true' : 'false';
return (
<View style={styles.container}>
<Text style={styles.welcome}>
Welcome to React Native! {this.state.showText} {this.state.showTextBool}
{this.state.wow}
</Text>
<TextInput style={styles.searchInput} value={this.state.wow} placeholder='Search via name or postcode'/>
<TouchableHighlight style={styles.button} underlayColor='#99d9f4'>
<Text style={styles.buttonText}>Go</Text>
</TouchableHighlight>
<Text style={styles.welcome}>
{display} + {this.onSignupPress()} + {this.state.showText}
</Text>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
buttonText: {
color: 'white',
alignSelf: 'center'
},
button: {
height: 36,
flex: 1,
flexDirection: 'row',
backgroundColor: '#48BBEC',
borderColor: '#48BBEC',
borderWidth: 1,
borderRadius: 8,
marginBottom: 10,
alignSelf: 'stretch',
justifyContent: 'center'
},
searchInput: {
height: 36,
padding: 4, marginRight: 5,
flex: 4,
fontSize: 18, borderWidth: 1, borderColor: '#48BBEC', borderRadius: 8, color: '#48BBEC'
}
});
AppRegistry.registerComponent('Test1', () => Test1);

Answer 1

I tried your code in react native express page. It renders one "true", but you are expected two (the text and the boolean). In the following part:
Welcome to React Native! {this.state.showText} {this.state.showTextBool}
The text is being rendered properly (it says indeed 'true'), but the boolean is not there, mainly because you cannot render a boolean like that. Try with the following:
{String(this.state.showTextBool)}
This will render the boolean value properly.