javascript - 如何在 react native 中单击按钮打开 react native 模式？

Question

我是 native react 新手，我正在尝试在单击按钮时打开模式。我正在尝试使用以下代码打开模式:-

  openHeaderModal = () => {
    <ModalDropdown
      options={["H1", "H2", "H3"]}
      dropdownStyle={{
        borderRadius: 6,
        backgroundColor: "#26344a",
        shadowColor: "rgba(0, 0, 0, 0.2)",
        shadowOffset: {
          width: 0,
          height: 5
        },
        shadowRadius: 20,
        shadowOpacity: 1,
        padding: 8
      }}
      dropdownTextStyle={{
        fontFamily: "poppins-500",
        fontSize: 16,
        fontStyle: "normal",
        letterSpacing: 0,
        textAlign: "left",
        color: "#ffffff",
        backgroundColor: "#26344a"
      }}
    >
    </ModalDropdown>
  }

我正在使用react-native-modal-dropdown作为模式。以下是我的按钮 jsx 代码:-

  <Button onPress={() => this.openHeaderModal()} vertical>
     <Image
       style={{ marginTop: 20 }}
       source={require("../assets/heading.png")}
     />
  </Button>

感谢任何帮助和支持。谢谢。

Answer 1

我认为在react-native中打开一个Modal非常简单，简单的例子:

import React, {Component} from 'react';
import {Modal, Text, TouchableHighlight, View} from 'react-native';

class ModalExample extends Component {
  state = {
    modalVisible: false,
  };

  setModalVisible(visible) {
    this.setState({modalVisible: visible});
  }

  render() {
    return (
      <View style={{marginTop: 22}}>
        <Modal
          animationType="slide"
          transparent={false}
          visible={this.state.modalVisible}
          onRequestClose={() => {
            alert('Modal has been closed.');
          }}>
          <View style={{marginTop: 22}}>
            <View>
              <Text>Hello World!</Text>

              <TouchableHighlight
                onPress={() => {
                  this.setModalVisible(!this.state.modalVisible);
                }}>
                <Text>Hide Modal</Text>
              </TouchableHighlight>
            </View>
          </View>
        </Modal>

        <TouchableHighlight
          onPress={() => {
            this.setModalVisible(true);
          }}>
          <Text>Show Modal</Text>
        </TouchableHighlight>
      </View>
    );
  }
}

链接:https://facebook.github.io/react-native/docs/modal.html#docsNav

如果你想使用库:https://github.com/react-native-community/react-native-modal