react native 使用 Modal 封装底部弹出面板（Bottom Sheet）组件

1. 创建一个名为 BottomSheetComponent.js 的文件

// BottomSheetComponent.js
import React, { useState, useEffect } from 'react';
import { Modal, View, Text, TouchableOpacity, Animated, StyleSheet, Dimensions } from 'react-native';

const { height } = Dimensions.get('window');

const BottomSheetComponent = ({ visible, onClose }) => {
  const [showModal, setShowModal] = useState(visible);
  const translateY = useState(new Animated.Value(height))[0];

  useEffect(() => {
    if (visible) {
      setShowModal(true);
      Animated.spring(translateY, {
        toValue: 0,
        useNativeDriver: true,
      }).start();
    } else {
      Animated.timing(translateY, {
        toValue: height,
        duration: 300,
        useNativeDriver: true,
      }).start(() => {
        setShowModal(false);
      });
    }
  }, [visible, translateY]);

  return (
    <Modal
      transparent
      visible={showModal}
      onRequestClose={onClose}
    >
      <TouchableOpacity style={styles.overlay} onPress={onClose} />
      <Animated.View style={[styles.container, { transform: [{ translateY }] }]}>
        <View style={styles.content}>
          <Text style={styles.title}>Hello, World!</Text>
          <Text style={styles.subtitle}>This is a bottom sheet panel</Text>
        </View>
      </Animated.View>
    </Modal>
  );
};

const styles = StyleSheet.create({
  overlay: {
    flex: 1,
    backgroundColor: 'rgba(0, 0, 0, 0.5)',
  },
  container: {
    position: 'absolute',
    bottom: 0,
    width: '100%',
    height: '50%', // Adjust the height as needed
    backgroundColor: 'white',
    borderTopLeftRadius: 20,
    borderTopRightRadius: 20,
  },
  content: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    padding: 16,
  },
  title: {
    fontSize: 24,
    fontWeight: 'bold',
  },
  subtitle: {
    fontSize: 16,
    color: 'gray',
  },
});

export default BottomSheetComponent;

2. 在其他页面中使用 BottomSheetComponent

// MainScreen.js
import React, { useState } from 'react';
import { View, Text, TouchableOpacity, StyleSheet } from 'react-native';
import BottomSheetComponent from './BottomSheetComponent'; // Adjust the path as needed

const MainScreen = () => {
  const [isBottomSheetVisible, setBottomSheetVisible] = useState(false);

  const toggleBottomSheet = () => {
    setBottomSheetVisible(!isBottomSheetVisible);
  };

  return (
    <View style={styles.container}>
      <TouchableOpacity
        style={styles.button}
        onPress={toggleBottomSheet}
      >
        <Text style={styles.buttonText}>Open Bottom Sheet</Text>
      </TouchableOpacity>
      <BottomSheetComponent visible={isBottomSheetVisible} onClose={toggleBottomSheet} />
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  button: {
    backgroundColor: '#6200ee',
    padding: 15,
    borderRadius: 25,
  },
  buttonText: {
    color: '#fff',
    fontSize: 16,
  },
});

export default MainScreen;