在React Native中使TextInput失去焦点 [英] Unfocus a TextInput in React Native

问题描述

我正在使用React Native构建一个Android应用程序.

I'm building an Android app with React Native.

如何强制将TextInput设置为"unFocus"，这意味着光标在文本字段内闪烁.有isFocused()和onFocus()的函数，但是实际上如何获取文本字段以放弃焦点.您可能会认为，一旦按下Enter键，它就会自动执行此操作，但事实并非如此.

How can you force a TextInput to "unFocus", meaning the cursor is blinking inside the text field. There are functions for isFocused() and onFocus(), but how do I actually get the text field to give up focus. You would think it does so automatically once I hit enter, but that's not the case.

   import React, {Component} from 'react';
   import { AppRegistry, Text, View, StyleSheet, TextInput, TouchableOpacity} 
   from 'react-native';

   var SHA256 = require("crypto-js/sha256");

   export default class LoginForm extends Component{


constructor(props){
    super(props);
    this.state = {
        email: '',
        password:''
    };
}

tryLogin = () => {
    if(this.state.email=="email123" && this.state.password == "password"){
        console.log("password verified");
        this.props.navigator.replace({
            title: 'Dashboard'
        });
    }

    console.log(this.state.email);
    console.log(this.state.password);
    console.log("Hash" + SHA256(this.state.password));
}

render(){
    return(
        <View style={styles.container}>
            <TextInput 
                style={styles.input}

                placeholder="Email address" 
                placeholderTextColor="white"
                onChangeText={(email) => this.setState({email})}>
            </TextInput>
            <TextInput style={styles.input} 
                placeholder="Password" 
                placeholderTextColor="white" 
                secureTextEntry
                onChangeText={(password) => this.setState({password})}>
            </TextInput>

            <TouchableOpacity style={styles.loginButtonContainer} onPress={this.tryLogin}>
                <Text style={styles.loginButtonText}>LOGIN</Text>
            </TouchableOpacity>
        </View>
  );
}
}

AppRegistry.registerComponent('LoginForm', () => LoginForm);

const styles =  StyleSheet.create({
container: {
    padding: 20
},
input:{
    height: 40,
    backgroundColor: '#e74c3c',
    marginBottom: 20,
    color: 'white',
    paddingHorizontal: 15,
    opacity: .9
},
loginButtonContainer:{
    justifyContent: 'center',
    backgroundColor: '#bc4c3c',
    paddingVertical:15

},
loginButtonText:{
    textAlign:'center',
    color:'white',
    fontWeight: '700',
    fontSize: 24

}

   })

这对实际用户而言可能无关紧要，但是如果我要重新加载，我只是在模仿它，而且讨厌.

This probably won't matter as much for real users but I'm just emulating and its pesky if I want to reload.

推荐答案

更好的方法是使用 ScrollView 和 Keyboard.dismiss .当用户在textInput之外点击时，使用 ScrollView 可以关闭键盘.这样做是因为 keyboardShouldPersistTaps 的 ScrollView 默认属性是从不.这是用户期望的行为.为了关闭键盘，或者等效地模糊 textInput ，当用户点击登录按钮时，将 Keyboard.dismissed()添加到 tryLogin 功能.

A better way is to use ScrollView and Keyboard.dismiss. By using ScrollView when the user taps outside of textInput, keyboard dismissed. It's done because ScrollView default property for keyboardShouldPersistTaps is never. It's the behavior the user expects. For dismiss the keyboard, or it's equivalent blur the textInput, when the user tap on the login button add Keyboard.dismissed() to the tryLogin function.

import React, {Component} from 'react';
import { AppRegistry, Text, View, StyleSheet, TextInput, TouchableOpacity, ScrollView, Keyboard}
  from 'react-native';
var SHA256 = require("crypto-js/sha256");

export default class LoginForm extends Component{


  constructor(props){
    super(props);
    this.state = {
      email: '',
      password:''
    };
  }

  tryLogin = () => {
    Keyboard.dismiss();
    if(this.state.email=="email123" && this.state.password == "password"){
      console.log("password verified");
      this.props.navigator.replace({
        title: 'Dashboard'
      });
    }

    console.log(this.state.email);
    console.log(this.state.password);
    console.log("Hash" + SHA256(this.state.password));
  }

  render(){
    return(
      <ScrollView style={styles.container}>
        <TextInput
          style={styles.input}

          placeholder="Email address"
          placeholderTextColor="white"
          onChangeText={(email) => this.setState({email})}>
        </TextInput>
        <TextInput style={styles.input}
                   placeholder="Password"
                   placeholderTextColor="white"
                   secureTextEntry
                   onChangeText={(password) => this.setState({password})}>
        </TextInput>

        <TouchableOpacity style={styles.loginButtonContainer} onPress={this.tryLogin}>
          <Text style={styles.loginButtonText}>LOGIN</Text>
        </TouchableOpacity>
      </ScrollView>
    );
  }
}

AppRegistry.registerComponent('LoginForm', () => LoginForm);

const styles =  StyleSheet.create({
  container: {
    padding: 20
  },
  input:{
    height: 40,
    backgroundColor: '#e74c3c',
    marginBottom: 20,
    color: 'white',
    paddingHorizontal: 15,
    opacity: .9
  },
  loginButtonContainer:{
    justifyContent: 'center',
    backgroundColor: '#bc4c3c',
    paddingVertical:15

  },
  loginButtonText:{
    textAlign:'center',
    color:'white',
    fontWeight: '700',
    fontSize: 24

  }

})

这篇关于在React Native中使TextInput失去焦点的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！