如何在react native中的另一个中使用组件的变量

Question

嗨，亲爱的，谢谢你来帮助我，我有一个名为PlayerWidget的组件，我想使用它，状态变量是AlbumHeader组件中的isPlaying值

这是我的代码

PlayerWidget

import React, { useContext, useEffect, useState } from 'react';
import { Text, Image, View, TouchableOpacity } from 'react-native';
import { AntDesign, FontAwesome } from "@expo/vector-icons";
import { API, graphqlOperation } from 'aws-amplify';
import styles from './styles';
import { Song } from "../../types";
import { Sound } from "expo-av/build/Audio/Sound";
import { AppContext, Status } from '../../AppContext';
import { getSong } from "../../src/graphql/queries";
const PlayerWidget = () => {
const [song, setSong] = useState(null);
const [sound, setSound] = useState<Sound | null>(null);
//this is the Variable I will like to use in my AlbumHeader Component isPlaying
const [isPlaying, setIsPlaying] = useState<boolean>(true);
const [duration, setDuration] = useState<number | null>(null);
const [position, setPosition] = useState<number | null>(null);
//const { songStatus, setSongStatus } = useContext(Status);
setSongStatus(isPlaying);

const { songId } = useContext(AppContext);

useEffect(() => {
const fetchSong = async () => {
try {
const data = await API.graphql(graphqlOperation(getSong, { id: songId }))
setSong(data.data.getSong);
} catch (e) {
console.log(e);
}
}
fetchSong();
}, [songId])
const onPlaybackStatusUpdate = (status) => {
setIsPlaying(status.isPlaying);
setDuration(status.durationMillis);
setPosition(status.positionMillis);

}
const playCurrentSong = async () => {
if (song.artist.length > 10) {
song.artist = song.artist.substring(0, 6) + "...";
}
if (song.title.length > 8) {
song.title = song.title.substring(0, 5) + "...";
}
if (sound) {
await sound.unloadAsync();
}
const { sound: newSound } = await Sound.createAsync(
{ uri: song.uri },
{ shouldPlay: isPlaying },
onPlaybackStatusUpdate
)
setSound(newSound)
}
useEffect(() => {
if (song) {
playCurrentSong();
}
}, [song])
const onPlayPausePress = async () => {
if (!sound) {
return;
}
if (isPlaying) {
await sound.stopAsync();
} else {
await sound.playAsync();
}
}
const getProgress = () => {
if (sound === null || duration === null || position === null) {
return 0;
}
return (position / duration) * 100;
}
if (!song) {
return null;
}
return (
<View style={styles.container}>
<View style={[styles.progress, { width: `${getProgress()}%` }]} />
<View style={styles.row}>
<Image source={{ uri: song.imageUri }} style={styles.image} />
<View style={styles.rightContainer}>
<View style={styles.nameContainer}>
<Text style={styles.title}>{song.title}</Text>
<Text style={styles.artist}>{song.artist}</Text>
</View>
<View style={styles.iconsContainer}>
<AntDesign name="hearto" size={20} color={'white'} />
<TouchableOpacity onPress={onPlayPausePress}>
<AntDesign name={isPlaying ? 'pausecircleo' : 'playcircleo'} size={25} color={'white'} />
</TouchableOpacity>
</View>
</View>
</View>
</View>
)
}

export default PlayerWidget;

这是我想在中使用的另一个(专辑标题(组件isPlaying值

import React from 'react';
import { useContext } from 'react';
import { View, Text, Image } from 'react-native';
import { TouchableOpacity } from 'react-native-gesture-handler';
import { AppContext, Status } from '../../AppContext';
import { Album } from '../../types';
import styles from './styles';

export type AlbumHeaderProp = {
album: Album;
}
const AlbumHeader = (props: AlbumHeaderProp) => {
const { album } = props;
const { setSongId, songId } = useContext(AppContext);
var playalbumSong = new Array();
const { songStatus } = useContext(Status);
const playallSong = () => {
const name = 'name';
console.log("I will play all the songs George huum");
const myArray = album.songs.items;
myArray.forEach((element: any, index: number, array: any) => {
playalbumSong.push(element.id);

});

console.log(songStatus);
setSongId(playalbumSong[0]);
}
return (
<View style={styles.container}>
<Image source={{ uri: album.imageUri }} style={styles.image} />
<Text style={styles.name}>{album.name}</Text>
<View style={styles.creatorContainer}>
<Text style={styles.creator}>By {album.by}</Text>
<Text style={styles.likes}>{album.numberOfLikes} Likes</Text>
</View>
<TouchableOpacity onPress={playallSong}>
<View style={styles.button}>
<Text style={styles.buttonText}>Play</Text>
</View>
</TouchableOpacity>
</View>
)
}
export default AlbumHeader;

Answer 1

如果AlbumHeader不是PlayerWidget的子级，则也需要使用全局状态，例如react redux或reducer hook。

Answer 2

我通过将该变量的值传递给相同类型的上下文来解决这个问题如果您使用react hook和功能组件