I'm using react-native-pager-view and I try to setPage on my index change but it doesn't work on iOS devices. Flow is like this that I try to pass the index as a props to my custom ViewPager and I'm using the UseEffect to setPage for my ViewPager which is not working on iOS and I have no idea why.
// #flow
import React, { useEffect, useRef } from 'react';
import { StyleSheet, View, I18nManager } from 'react-native';
import PagerView, { PagerViewOnPageSelectedEvent } from 'react-native-pager-view';
type Props = {
children: React$Node,
index: number,
onIndexChange: (index: number) => void,
};
const MyViewPager = ({ children, index, onIndexChange }: Props) => {
const viewPagerRef = useRef<PagerView>(null);
useEffect(() => {
viewPagerRef.current?.setPage(index);
}, [index]);
const onPageSelect = (e: PagerViewOnPageSelectedEvent) => {
onIndexChange(e.nativeEvent.position);
};
return (
<View style={styles.container}>
<PagerView
ref={viewPagerRef}
style={styles.container}
initialPage={index}
orientation="horizontal"
onPageSelected={onPageSelect}
>
{children}
</PagerView>
</View>
);
};
const styles = StyleSheet.create({
container: {
flex: 1,
},
});
export default MyViewPager;
the #next version "^6.0.0-rc.0" worked for me
yarn add react-native-pager-view#^6.0.0-rc.0
or if you are using npm
npm i react-native-pager-view#^6.0.0-rc.0
If you have layoutDirection="rtl" prop in PagerView.
Try Removing it e.g
Not working code
<PagerView
initialPage={0}
layoutDirection="rtl"
ref={ref}
scrollEnabled={false} >
Working code for me
<PagerView
initialPage={0}
ref={ref}
scrollEnabled={false} >
This solution worked for me.
Related
I'm new to programming and I can't seem to add touchable opacity to flatlist renderitem for contacts. anyone can help?
I need this code to have a touchable opacity
import React, {useEffect, useState} from 'react';
import {FlatList, View, Text, StyleSheet,TouchableOpacity} from 'react-native';
import Contacts from 'react-native-contacts';
import {Contact} from '.';
const ContactsList = () => {
const [contacts, setContacts] = useState([]);
useEffect(() => {
Contacts.getAll().then(contacts => {
setContacts(contacts);
});
}, []);
const keyExtractor = (item, idx) => {
return item?.recordID?.toString() || idx.toString();
};
const renderItem = ({item, index}) => {
return <Contact contact={item} />;
};
return (
<FlatList
data={contacts}
keyExtractor={keyExtractor}
style={styles.list}
renderItem={ renderItem }
/>
);
};
const styles = StyleSheet.create({
list: {
flex: 1,
},
});
export default ContactsList;
I have problem with render data on IOS Simulator. Render is work properly on website, but on IOS I still got stuck on "Loading.." text.
Here is my code:
import React from 'react'
import { useState } from 'react';
import { useEffect } from 'react';
import { SafeAreaView, Text, View, StyleSheet, Image, Alert } from 'react-native';
import { Card } from 'react-native-paper'
import firebase from 'firebase'
import Button from '../components/Button'
import Background from '../components/Background'
import TopBar from '../components/TopBar'
export default function HomeScreen({ navigation }) {
const [data, setData] = useState([])
const sampleData = [{id:0, title:"One"}, {id:1, title: "Two"}]
useEffect(() =>
{
const donorsData = [];
firebase.database()
.ref("testdb")
.orderByChild("isDonor")
.equalTo(true)
.once("value")
.then((results) => {
results.forEach((snapshot) => {
donorsData.push(snapshot.val());
});
setData(donorsData);
});
}, [])
const card = data.length > 0
? data.map(item =>
{
return <Card key={item.uid} style={{ marginBottom: 20, borderRadius: 10, }}>
<Text>{item.name}</Text>
<Text>{item.description}</Text>
<Image src={item.photo}></Image>
</Card>
})
: <Text>Loading...</Text>
return (
<View style={styles.container}>
{card}
</View>
);
}
On website is everything ok Website Screen
But on IOS Simulator I got only Loading
IOS Screen
I tried a lot of solutions found here, but no one works with this case. I think is probably because iOS doesn't have data? When I put console log at to top of return, I got nothing.
This might be a race condition error. You shouldn't rely on the data being fetched within 1500ms.
If that doesn't work. Make sure your result from firebase is correct.
Maybe something like this?
const [data, setData] = useState([])
const fetchDonorData = () => {
firebase.database()
.ref("testdb")
.orderByChild("isDonor")
.equalTo(true)
.once("value")
.then((results) => {
console.log({result}) //Make sure the data looks the way you want it
const mappedResult = results?.map(snapshot => snapshot.val())
setData(mappedResult)
})
}
useEffect(() => {
fetchDonorData()
}, [])
const renderItem = ({item}) =>
<Card style={{ marginBottom: 20, borderRadius: 10, }}>
<Text>{item.name}</Text>
<Text>{item.description}</Text>
<Image src={item.photo}></Image>
</Card>
return (
<View style={styles.container}>
<FlatList
data={data}
renderItem={renderItem}
keyExtractor={({item}) => item.uid}
ListEmptyComponent={<Text>Loading...</Text>}
/>
</View>
)
I'm communicating to an API to update a state in my application. Everything works fine on PC. But on iOS the network request is 400 and the API does not return anything. Why? I'm running both through CORS anywhere and I've made sure to activate it both on my PC and my iOS device. One of the APIs that I'm communicating with in another file does work on both devices.
Home.js
import React, { useEffect, useState } from "react";
import { View, Text, SafeAreaView, ScrollView } from "react-native";
import { Divider } from "react-native-elements";
import BottomTabs from "../components/home/BottomTabs";
import Categories from "../components/home/Categories";
import HeaderTabs from "../components/home/HeaderTabs";
import RestaurantItems, {
localRestaurants,
} from "../components/home/RestaurantItems";
import SearchBar from "../components/home/SearchBar";
const YELP_API_KEY =
"x";
export default function Home({ navigation }) {
const [restaurantData, setRestaurantData] = useState(localRestaurants);
const [city, setCity] = useState("City");
const [activeTab, setActiveTab] = useState("Delivery");
const getRestaurantsFromYelp = () => {
const yelpUrl = `https://api.yelp.com/v3/businesses/search?term=restaurants&location=${city}`;
const corsUrl = `https://cors-anywhere.herokuapp.com/${yelpUrl}`;
const apiOptions = {
headers: {
Authorization: `Bearer ${YELP_API_KEY}`,
},
};
return fetch(corsUrl, apiOptions)
.then((res) => res.json())
.then((json) => {
console.log("JSON:", json.businesses);
setRestaurantData(json.businesses);
})
.catch((e) => console.log(e));
};
useEffect(() => {
getRestaurantsFromYelp();
}, [city, activeTab]);
useEffect(() => {
console.log("Restaurant Data Updated", restaurantData);
}, [restaurantData]);
return (
<SafeAreaView style={{ backgroundColor: "#eee", flex: 1 }}>
<View style={{ backgroundColor: "white", padding: 15 }}>
<HeaderTabs activeTab={activeTab} setActiveTab={setActiveTab} />
<SearchBar cityHandler={setCity} />
</View>
<ScrollView showsVerticalScrollIndicator={false}>
<Categories />
<RestaurantItems
restaurantData={restaurantData}
navigation={navigation}
/>
</ScrollView>
<Divider width={1} />
<BottomTabs />
</SafeAreaView>
);
}
Hello i'm currently working with React native using my rails api to retrieve user micropost data. The data renders in my log but comes up blank in react native. Honestly not sure what i'm doing wrong. can anyone help? Maybe the JSON is the problem?
Here is the JSON data:
[{"id":4,"content":"fool","user_id":1,"created_at":"2018-06-21T00:50:08.343Z","updated_at":"2018-06-21T00:50:08.343Z","picture":{"url":null}},{"id":3,"content":"pool\r\n","user_id":1,"created_at":"2018-06-21T00:50:04.644Z","updated_at":"2018-06-21T00:50:04.644Z","picture":{"url":null}},{"id":2,"content":"cool","user_id":1,"created_at":"2018-06-16T04:26:11.020Z","updated_at":"2018-06-16T04:26:11.020Z","picture":{"url":null}}]
And Here is my React Native code:
import React, { Component } from "react";
import { FlatList, StyleSheet, Text, View, AsyncStorage } from "react-
native";
const ACCESS_TOKEN = 'access_token';
export default class App extends Component {
state = {
data: []
};
componentWillMount() {
this.fetchData();
}
fetchData = async () => {
let accessToken = await AsyncStorage.getItem(ACCESS_TOKEN);
const response = await fetch("https://example.com/api/users/"+accessToken);
const json = await response.json();
this.setState({ data: json.data });
};
render() {
return (
<View style={styles.container}>
<FlatList
data={this.state.data}
keyExtractor={item => item.toString()}
renderItem={({ item }) =>
<Text>
//also tried {`${item.content}`}, didn't work
{`${item.microposts.content}`}
</Text>}
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
marginTop: 15,
flex: 1,
justifyContent: "center",
alignItems: "center",
backgroundColor: "#F5FCFF"
}
});
Remove the extra }
Please optimize code by declaring renderItem as such
renderItem={({ item }) => <Text>{item.microposts && item.microposts.content}</Text>}
I'm currently using my api to render all posts in JSON to react native. But I keep getting this undefined error. And sometimes the data just wont render. Can anyone give me any help on rendering this data in react native? And explain to me what i'm doing wrong? I'm pretty new with JSON. Thanks :)
Here is my JSON:
{"data":[{"id":"1","type":"posts","links":{"self":"https://example.com/posts/1"},"attributes":{"title":"Laughter Post","context":{}},"relationships":{"user":{"links":{"self":"https://example.com/posts/1/relationships/user","related":"https://example.com/posts/1/user"}}}}]}
And here is my react native code:
import React, { Component } from "react";
import { FlatList, StyleSheet, Text, View } from "react-native";
export default class App extends Component {
state = {
data: []
};
componentWillMount() {
this.fetchData();
}
fetchData = async () => {
const response = await fetch("https://example.com/posts.json");
const json = await response.json();
this.setState({ data: json.data });
};
render() {
return (
<View style={styles.container}>
<FlatList
data={this.state.data}
keyExtractor={item => item.toString()}
renderItem={({ item }) =>
<Text>
{`${item.title}`}
</Text>}
/>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
marginTop: 15,
flex: 1,
justifyContent: "center",
alignItems: "center",
backgroundColor: "#F5FCFF"
}
});
It seems you are accessing title directly from the root, but it is inside key attributes
It should be
{`${item. attributes.title}`}
Or else if you can tell us the exact error, we can help you more regarding this issue.