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React Native-从子函数调用父ref函数

ecmascript-6 react-native reactjs javascript

0

MoKhajavi75 · 技术社区 · 7 年前

Parent 组成部分:

import React, { Component } from "react";
import { View, TextInput } from "react-native";

class Parent extends Component {
  constructor(props) {
    super(props);

    this.state = {
      txt: ""
    };
  }

  render() {
    return (
      <View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
        <TextInput
          ref={parentInput => {
            this.parentInput = parentInput;
          }}
          style={{
            width: 200,
            height: 100
          }}
          onChangeText={txt => this.setState({ txt })}
          value={this.state.txt}
        />
      </View>
    );
  }
}

export default Parent;

Child 组成部分:

import React, { Component } from "react";
import { View, Text, TouchableOpacity } from "react-native";

class Child extends Component {
  constructor(props) {
    super(props);
  }

  render() {
    return (
      <View style={{ flex: 1, justifyContent: "center", alignItems: "center" }}>
        <TouchableOpacity
          style={{
            justifyContent: "center",
            alignItems: "center",
            width: 200,
            height: 100
          }}
          onPress={() => {
            // ???
          }}
        >
          <Text>Clear Input!</Text>
        </TouchableOpacity>
      </View>
    );
  }
}

export default Child;

我知道我可以在中清除家长的输入 父母亲 使用 this.parentInput.clear() 但我怎样才能从法律上澄清这一点呢 小孩 组件?

提前谢谢!

1 回复 | 直到 7 年前

1

2

Anand Undavia 7 年前

prop .

例如 Child

<TouchableOpacity
  style={{
    justifyContent: "center",
    alignItems: "center",
    width: 200,
    height: 100
  }}
  onPress={() => {
    this.props.onClick(); // <-- you might want to pass some args as well
  }}
>

来自 Parent onClick 道具作为功能:

<Child onClick={() => { 
    console.log('onclick of parent called!');
    this.parentInput.clear(); 
    // Add something more here 
}}>

然而,对于高级用例,我建议使用任何状态管理库,如 Redux .