问题描述
我正在尝试获取我过去使用 react-navigation v4 获得的帖子的 ID,如下所示:
这是我的索引屏幕
1import React,{ useContext } from 'react';
2import { View,Text,StyleSheet,FlatList,Button,TouchableOpacity } from 'react-native';
3import { Context } from '../../context/BlogContext';
4import { Feather } from '@expo/vector-icons';
5
6const IndexScreen = ({ navigation }) => {
7 const { state,addBlogPost,deleteBlogPost } = useContext(Context);
8 return (
9 <View style={styles.container}>
10 <Button title="Add Post" onPress={addBlogPost} />
11 <FlatList
12 data={state}
13 keyExtractor={blogPost => blogPost.title}
14 renderItem={({ item }) => {
15 return (
16 <TouchableOpacity onPress={() => navigation.navigate('Show',{ id: item.id })}>
17 <View style={styles.row}>
18 <Text style={styles.title}>{item.title} - {item.id}</Text>
19 <TouchableOpacity>
20 <Feather style={styles.icon}
21 name="trash"
22 onPress={() => deleteBlogPost(item.id)}
23 />
24 </TouchableOpacity>
25 </View>
26 </TouchableOpacity>
27 );
28 }}
29 />
30 </View>
31 );
32 }
33
34IndexScreen.navigationopitions = () => {
35 return {
36 headerRight: () => (
37 <TouchableOpacity onPress={() => navigation.navigate('Create')}>
38 <Feather name="plus" size={30} />
39 </TouchableOpacity>
40 ),41 };
42}
43
44const styles = StyleSheet.create({
45 row: {
46 flexDirection: 'row',47 justifyContent: 'space-between',48 paddingVertical: 15,49 paddingHorizontal: 10,50 borderTopWidth: 1,51 borderBottomWidth: 1,52 borderColor: 'grey'
53 },54 title: {
55 fontSize: 18,56 },57 icon: {
58 fontSize: 24,59 color: '#ff2222'
60 }
61});
62
63export default IndexScreen;
64
现在是我的显示屏幕,我曾经在其中使用 state.find (blogPost => blogPost.id === navigation.getParam('id')) 获取博客文章,如第 10 行所示。
1import { useNavigation } from '@react-navigation/native';
2import React,{ useContext } from 'react';
3import { View,StyleSheet } from 'react-native';
4import { Context } from '../../context/BlogContext';
5
6const ShowScreen = ({ navigation }) => {
7 const navigation = useNavigation();
8 const { state } = useContext(Context);
9
10 const blogPost = state.find (blogPost => blogPost.id === navigation.getParam('id'));
11
12 return (
13 <View>
14 <Text>{blogPost}</Text>
15 </View>
16 );
17};
18
19const styles = StyleSheet.create({});
20
21export default ShowScreen;
22
现在我不再使用 react-navigation v4,而是使用 v5,但我想在第 14 行的文本行中获取 blogPost。我应该怎么做才能得到它?
解决方法
const ShowScreen = ({ route,navigation }) => {
const { state } = useContext(Context);
const {id} = route.params;
return (
<View>
<Text>{id}</Text>
</View>
);
};
欲了解更多信息,请查看 react navigation docs