Javascript 为什么赢了';t<;TextInput/>;显示什么';正在打印什么?
每当我在我的物理设备上点击第一个Javascript 为什么赢了';t<;TextInput/>;显示什么';正在打印什么?,javascript,ios,reactjs,react-native,expo,Javascript,Ios,Reactjs,React Native,Expo,每当我在我的物理设备上点击第一个框中的Email时,我都看不到输入的内容。只有当我按Next进入密码框时,我才能看到电子邮件框中键入的内容。为什么会这样 下面是App.js的 import React, {Component} from 'react'; import {View, StyleSheet} from 'react-native'; import BackGround from './components/BackGround'; export default class App
框中的Email
时,我都看不到输入的内容。只有当我按Next
进入密码
框时,我才能看到电子邮件
框中键入的内容。为什么会这样
下面是App.js的
import React, {Component} from 'react';
import {View, StyleSheet} from 'react-native';
import BackGround from './components/BackGround';
export default class App extends Component {
render() {
return(
<View style={styles.back}>
<BackGround/>
</View>
);
}
}
const styles = StyleSheet.create({
back: {
flex: 1
}
});
import React, {Component} from 'react';
import {StyleSheet, TextInput, View, Text, TouchableOpacity, KeyboardAvoidingView} from 'react-native';
class Login extends Component {
constructor(props) {
super(props);
this.state = {
text: ''
};
}
updateTextInput = text => this.setState({text});
render() {
return(
<KeyboardAvoidingView behavior={"padding"} style={styles.container}>
<View>
<TextInput
style={styles.input}
returnKeyType={"next"}
keyboardType={"email-address"}
autoCorrect={false}
onChangeText={this.updateTextInput}
value={this.state.text}
/>
<TextInput
style={styles.input}
returnKeyType={"go"}
secureTextEntry
/>
<TouchableOpacity>
<Text style={styles.loginAndCA}>Login</Text>
</TouchableOpacity>
<TouchableOpacity>
<Text style={styles.loginAndCA}>Create Account</Text>
</TouchableOpacity>
</View>
</KeyboardAvoidingView>
);
}
}
const styles = StyleSheet.create({
container: {
padding: 20
},
input: {
backgroundColor: '#DAE5FF',
paddingBottom: 20,
padding: 20,
paddingHorizontal: 15,
marginBottom: 10,
borderRadius: 15,
},
loginAndCA: {
fontSize: 40,
textAlign: 'center',
color: 'white',
fontFamily: 'Bodoni 72 Smallcaps',
paddingHorizontal: 10
},
buttons: {
paddingBottom: 50
}
});
export default Login;
import React, {Component} from 'react';
import {StyleSheet, Image, View} from 'react-native';
import Login from './Login';
export default class BackGround extends Component {
render() {
return(
<View style={styles.first}>
<Image style={styles.container} source={require('../pictures/smoke.jpg')}>
<View style={styles.second}>
<Login/>
</View>
</Image>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
width: null,
height: null,
backgroundColor: 'rgba(0,0,0,0)',
resizeMode: 'cover'
},
first: {
flex: 1
},
second: {
paddingTop: 290 // Moves both <TextInput> boxes down.
}
});
下面是BackGround.js
:
import React, {Component} from 'react';
import {View, StyleSheet} from 'react-native';
import BackGround from './components/BackGround';
export default class App extends Component {
render() {
return(
<View style={styles.back}>
<BackGround/>
</View>
);
}
}
const styles = StyleSheet.create({
back: {
flex: 1
}
});
import React, {Component} from 'react';
import {StyleSheet, TextInput, View, Text, TouchableOpacity, KeyboardAvoidingView} from 'react-native';
class Login extends Component {
constructor(props) {
super(props);
this.state = {
text: ''
};
}
updateTextInput = text => this.setState({text});
render() {
return(
<KeyboardAvoidingView behavior={"padding"} style={styles.container}>
<View>
<TextInput
style={styles.input}
returnKeyType={"next"}
keyboardType={"email-address"}
autoCorrect={false}
onChangeText={this.updateTextInput}
value={this.state.text}
/>
<TextInput
style={styles.input}
returnKeyType={"go"}
secureTextEntry
/>
<TouchableOpacity>
<Text style={styles.loginAndCA}>Login</Text>
</TouchableOpacity>
<TouchableOpacity>
<Text style={styles.loginAndCA}>Create Account</Text>
</TouchableOpacity>
</View>
</KeyboardAvoidingView>
);
}
}
const styles = StyleSheet.create({
container: {
padding: 20
},
input: {
backgroundColor: '#DAE5FF',
paddingBottom: 20,
padding: 20,
paddingHorizontal: 15,
marginBottom: 10,
borderRadius: 15,
},
loginAndCA: {
fontSize: 40,
textAlign: 'center',
color: 'white',
fontFamily: 'Bodoni 72 Smallcaps',
paddingHorizontal: 10
},
buttons: {
paddingBottom: 50
}
});
export default Login;
import React, {Component} from 'react';
import {StyleSheet, Image, View} from 'react-native';
import Login from './Login';
export default class BackGround extends Component {
render() {
return(
<View style={styles.first}>
<Image style={styles.container} source={require('../pictures/smoke.jpg')}>
<View style={styles.second}>
<Login/>
</View>
</Image>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
width: null,
height: null,
backgroundColor: 'rgba(0,0,0,0)',
resizeMode: 'cover'
},
first: {
flex: 1
},
second: {
paddingTop: 290 // Moves both <TextInput> boxes down.
}
});
import React,{Component}来自'React';
从“react native”导入{样式表、图像、视图};
从“./Login”导入登录名;
导出默认类后台扩展组件{
render(){
返回(
);
}
}
const styles=StyleSheet.create({
容器:{
弹性:1,
为内容辩护:“中心”,
对齐项目:“居中”,
宽度:空,
高度:空,
背景颜色:“rgba(0,0,0,0)”,
resizeMode:“封面”
},
第一:{
弹性:1
},
第二:{
paddingTop:290//向下移动两个框。
}
});
您需要给它一个连接到状态的值,当该文本输入发生变化时,您将更新状态值:
export default class TextInputExample extends Component {
constructor(props) {
super(props);
this.state = {
text: ''
};
}
updateTextInput = text => this.setState({ text })
render() {
return (
<View style={{ flex: 1}}>
<TextInput
style={{height: 40}}
placeholder="Type here!"
onChangeText={this.updateTextInput}
value={this.state.text}
/>
</View>
);
}
}
导出默认类TextInputExample扩展组件{
建造师(道具){
超级(道具);
此.state={
文本:“”
};
}
updateTextInput=text=>this.setState({text})
render(){
返回(
);
}
}
您需要将值
和onTextChange
道具传递到文本输入
你为什么要把它作为图像标签的子对象?对不起,我刚刚意识到我忘记给文本输入添加值了。如果仍然遇到问题,请尝试并发布更新的代码。