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我现在使用的是React Native。现在我试图打印出一个已初始化的状态(例如,此处的showText)。当我在渲染中记住这个值时,它不会显示(空白)。我记得的方式是“{this.state.showText}”。它不会产生任何错误消息。在React Native中未打印状态
也许因为同样的原因,TouchableHighlight的初始值似乎是空白的。由于Facebook Github中的示例应用程序在该网站中正常工作,因此我完全迷失在这里。请给我任何关于这个问题的想法。
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);