Develop Reference

Displaying a Image from the Camera

I am relatively new to React-Native and mobile app development. I am trying to create a clone of Instagram. And in the post screen what I do is I have a button Camera and once I click on it, that should take me to CameraView screen. And in the CameraView screen I will take a picture using expo-camera and save the picture in a variable. So here, I want to export the picture and then import it in my Post screen, so that the user can have a preview of what the picture looks like before uploading. And another thing to note is that, the Post screen will by default have a Placeholder image and once the image is taken the placeholder image has to be replaced with the image.
I tried this code but it didnt work.
My Post screen :-
import { View, Text, Image, TextInput } from 'react-native';
import React, { useState, useEffect } from 'react'
import * as Yup from 'yup';
import { Formik } from 'formik'
import { Button, Divider } from 'react-native-elements';
import { useNavigation } from '#react-navigation/native';
import CameraView, { takePicture } from '../../screens/CameraView';
const PLACEHOLDER_IMG = require('../../assets/defImg.png')
const uploadPostSchema = Yup.object().shape({
caption: Yup.string().max(2200, 'Caption cannot exceed character limit.')
})
const FormikPostUploader = ({route}) => {
const [thumbnailUrl, setThumbnailUrl] = useState(PLACEHOLDER_IMG)
const navigation = useNavigation()
const handleCameraPress = () => {
UserImage = takePicture()
setThumbnailUrl(UserImage)
navigation.navigate('CameraView')
}
return (
<Formik
initialValues={{ imageUrl: '', caption:'' }}
onSubmit={(values) => console.log(values)}
validationSchema={uploadPostSchema}
validateOnMount={true}>
{({
handleBlur,
handleChange,
handleSubmit,
values,
errors,
isvalid
}) => (
<>
<View style={{ margin: 20, justifyContent: 'space-between', flexDirection: 'row' }}>
<Image source={thumbnailUrl} />
<View style={{ flex: 1, margin: 15 }}>
<TextInput
placeholder='Write a caption...'
placeholderTextColor='gray'
multiline={true}
style={{ color: 'white', fontSize: 17 }}
onChangeText={handleChange('caption')}
onBlur={handleBlur('caption')}
value={values.caption}
/>
</View>
</View>
<Divider width={0.5} orientation='vertical'/>
<View style={{ alignItems: 'center', marginTop: 15 }}>
<Text style={{ fontSize: 18, fontWeight: 'bold', color: 'white' }}>Choose Image</Text>
</View>
<View style={{ justifyContent: 'space-between', flexDirection: 'column', margin: 20 }}>
<View style={{ justifyContent: 'space-between', flexDirection: 'row', margin: 30 }}>
<Button title='Camera' onPress={handleCameraPress}/>
<Button title='Gallery' onPress={() => navigation.navigate('GalleryView')} />
</View>
<Button onPress={handleSubmit} title='Post' disabled={isvalid} />
</View>
</>
)}
</Formik>
)
}
export default FormikPostUploader
And my CameraView screen :-
import { View, Text, Image, StyleSheet, Button } from 'react-native'
import React, {useState, useEffect} from 'react'
import { Camera } from 'expo-camera'
import { TouchableOpacity } from 'react-native'
import { useNavigation } from '#react-navigation/native'
import { PLACEHOLDER_IMG } from '../components/newPost/FormikPostUploader'
export const takePicture = async(camera) => {
const data = await camera.takePictureAsync(null)
return data.uri
}
const Header = () =>{
const navigation = useNavigation()
return (
<View style = {styles.headerContainer}>
<TouchableOpacity style = {{marginBottom:15}} onPress={() => navigation.goBack()}>
<Image source = {require('../assets/back.png')} style = {{width:35, height:35, margin:20}}/>
</TouchableOpacity>
<Text style={{color:'white', fontWeight: '700', fontSize:20, marginRight: 25, marginTop:35, marginBottom:15}}>New Post</Text>
<Text> </Text>
</View>
)
}
const CameraView = () => {
const UserImage = takePicture()
const navigation = useNavigation()
const [hasCameraPermission, setHasCameraPermission] = useState(null)
const [thumbnailUrl, setThumbnailUrl] = useState(PLACEHOLDER_IMG)
const [camera, setCamera] = useState(null)
const [type, setType] = useState(Camera.Constants.Type.back)
const captureImage = async () => {
if (camera) {
const UserImage = await takePicture(camera)
setThumbnailUrl(UserImage)
}
}
useEffect(() => {
(async() => {
const cameraStatus = await Camera.requestCameraPermissionsAsync()
setHasCameraPermission(cameraStatus.status === 'granted')})()},
[])
if (hasCameraPermission === null) {
return <View/>
}
if (hasCameraPermission === false){
return <Text>Enable access for Camera to proceed</Text>
}
return (
<View style={{ flex: 1, backgroundColor: 'black'}}>
<Header/>
<Camera
ref = {ref => setCamera(ref)}
style={styles.fixedRatio}
type={type}
ratio={'1:1'}/>
<View style = {styles.cameraContainer}>
<TouchableOpacity onPress={() => {setType(type === Camera.Constants.Type.back ? Camera.Constants.Type.front : Camera.Constants.Type.back)}}>
<Image source={require('../assets/turn-camera.png')} style = {{width:70, height:70, margin: 15}}/>
</TouchableOpacity>
<TouchableOpacity onPress={() => {captureImage(), navigation.goBack(), console.log(UserImage)}}>
<Image source={require('../assets/camera-shutter.png')} style = {{width:70, height:70, marginRight:60}}/>
</TouchableOpacity>
</View>
</View>
)
}
const styles = StyleSheet.create({
cameraContainer: {
flex:0.15,
backgroundColor: 'black',
flexDirection:'row',
justifyContent: 'space-between',
alignItems: 'center',
},
fixedRatio: {
flex:0.99,
aspectRatio:0.9
},
headerContainer: {
flexDirection: 'row',
justifyContent: 'space-between',
alignItems: 'center',
backgroundColor:'black'
},
icon: {
width:25,
height: 25,
marginHorizontal:15,
marginTop:30,
},
iconContainer: {
flexDirection:'row',
justifyContent: 'space-between',
height:50,
},
}
)
export default CameraView
Am I doing anything wrong. Can you help me fix this. Thanks in advance!

Resulting in a blank screen when listing data with Firebase(Firestore) in React Native

Data listing process with Firebase(Firestore) in React Native.
In the video I watched, he wrote and ran the code that lists the coins belonging to the user using firestore. It did not work even though I wrote the same codes. What is the reason? the code does not give an error, the screen appears, but it does not list.
The problem is that when I did the listing in console it worked. However, when I try to list with FlatList, the screen appears blank.
import { View, Text, SafeAreaView, TouchableOpacity, FlatList } from 'react-native'
import React, { useContext, useState, useEffect } from 'react'
import IconFA5 from 'react-native-vector-icons/FontAwesome5'
import IconFA from 'react-native-vector-icons/FontAwesome'
import { deviceWidth, deviceHeight } from '../../utils/dimensions'
import { AuthContext } from '../../navigation/AuthProvider'
import { Formik, validateYupSchema } from 'formik'
import * as yup from 'yup'
import { firebase } from '#react-native-firebase/auth'
import auth from '#react-native-firebase/auth'
import firestore from '#react-native-firebase/firestore'
const color = '#aaa';
const HomeScreen = ({ navigation }) => {
const renderItem = (item) => {
<TouchableOpacity
key={item.id}
style={{
flexDirection: 'row',
width: '95%',
height: 60,
borderWidth: 1,
margin: 10,
borderRadius: 20,
padding: 10,
justifyContent: 'space-between',
alignItems: 'center'
}}>
<View style={{ flex: 1 }}>
<Text style={{
textAlign: 'left',
fontSize: 18
}}>{item.coinID}</Text>
</View>
<View style={{ flex: 1 }}>
<Text style={{
textAlign: 'right',
fontSize: 18
}}>{item.value}</Text>
</View>
</TouchableOpacity>
}
const { signOut, user } = useContext(AuthContext);
const [currentUser, setCurrentUser] = useState({});
const [userCoinList, setUserCoinList] = useState([]);
const usersColl = firestore().collection('users');
const coinsColl = firestore().collection('coins');
const userCoinsColl = firestore().collection('userCoins');
useEffect(() => {
return usersColl
.doc(user.uid)
.get()
.then(result => {
setCurrentUser(result.data());
userCoinsColl.onSnapshot((querySnapshot) => {
let list = [];
querySnapshot.forEach(doc => {
const { userID, coinID, value } = doc.data();
if (userID == user.uid) {
list.push({
id: doc.id,
userID,
coinID,
value
});
setUserCoinList(list);
}
});
});
});
}, []);
return (
<SafeAreaView style={{ width: '100%', height: '100%' }}>
<View style={{
width: '100%',
height: '90%',
padding: 5,
flex: 1,
alignItems: 'center'
}}>
<View>
<FlatList
style={{ flex: 3, backgroundColor: '#f00' }}
data={userCoinList}
keyExtractor={item => item.id}
renderItem={renderItem}
/>
{console.log(userCoinList)}
</View>
</View>
</SafeAreaView>
)
}
export default HomeScreen

Your renderItem function does not return anything.
Here is a fix.
const renderItem = (item) => {
return <TouchableOpacity
key={item.id}
style={{
flexDirection: 'row',
width: '95%',
height: 60,
borderWidth: 1,
margin: 10,
borderRadius: 20,
padding: 10,
justifyContent: 'space-between',
alignItems: 'center'
}}>
<View style={{ flex: 1 }}>
<Text style={{
textAlign: 'left',
fontSize: 18
}}>{item.coinID}</Text>
</View>
<View style={{ flex: 1 }}>
<Text style={{
textAlign: 'right',
fontSize: 18
}}>{item.value}</Text>
</View>
</TouchableOpacity>
}

tabBarOptions not applied to project (React Native)

I am creating a small app that has a to-do list and a calendar. At the bottom is a bottom tab navigator. Everything works and is functional, however, when I try to add style: {} inside tabBarOptions it isn't being applied. Changing activeTintColor, inactiveTintColor and labelStyle works just fine.
I tried to create a stylesheet and replace everything inside tabBarOptions, but that didn't work. My main goal is to simply create a slightly larger bar along the bottom of the screen. I don't even want a crazy custom navigation bar, just slightly larger so I can make the items inside a little bigger.
MainContainer Class:
import React from 'react';
import {StyleSheet} from 'react-native';
import {NavigationContainer} from '#react-navigation/native';
import {createBottomTabNavigator} from '#react-navigation/bottom-tabs';
import Ionicons from 'react-native-vector-icons/Ionicons'
//screens
import Calendar from './screens/Calendar';
import ToDoList from './screens/ToDoList';
// Screen names
const calendarName = 'Calendar';
const ToDoListName = 'To Do List';
const Tab = createBottomTabNavigator();
export default function MainContainer() {
return (
<NavigationContainer>
<Tab.Navigator
tabBarOptions={{
activeTintColor: 'tomato',
inactiveTintColor: 'black',
labelStyle: {paddingBottom: 10, fontSize: 10},
style: {padding: 10, height: 70},
}}
initialRouteName={ToDoListName}
screenOptions={({route}) => ({
tabBarIcon: ({focused, color, size}) => {
let iconName;
let rn = route.name;
if (rn === ToDoListName) {
iconName = focused ? 'list' : 'list-outline'; //icons in package. Change later.
} else if (rn === calendarName) {
iconName = focused ? 'calendar' : 'calendar-outline'
}
return <Ionicons name={iconName} size={size} color={color}/>
},
})}>
<Tab.Screen name={ToDoListName} component={ToDoList}/>
<Tab.Screen name={calendarName} component={Calendar}/>
</Tab.Navigator>
</NavigationContainer>
)
}
For reference here is my ToDoList class
import { KeyboardAvoidingView, StyleSheet, Text, View, TextInput, TouchableOpacity, Platform, Keyboard } from 'react-native';
import Task from '../../components/Task';
import React, { useState } from 'react';
import { ScrollView } from 'react-native-web';
export default function ToDoList() {
const [task, setTask] = useState();
const [taskItems, setTaskItems] = useState([]);
const handleAddTask = () => {
Keyboard.dismiss();
setTaskItems([...taskItems, task])
setTask(null);
}
const completeTask = (index) => {
let itemsCopy = [...taskItems];
itemsCopy.splice(index, 1);
setTaskItems(itemsCopy)
}
return (
<View style={styles.container}>
{/* Scroll View when list gets longer than page */}
<ScrollView contentContainerStyle={{
flexGrow: 1
}} keyboardShouldPersistTaps='handled'>
{/*Today's Tasks */}
<View style={styles.tasksWrapper}>
<Text style={styles.sectionTitle}>Today's Tasks</Text>
<View style={styles.items}>
{/* This is where the tasks will go*/}
{
taskItems.map((item, index) => {
return (
<TouchableOpacity key={index} onPress={() => completeTask(index)}>
<Task text={item} />
</TouchableOpacity>
)
})
}
</View>
</View>
</ScrollView>
{/* Write a task section */}
{/* Uses a keyboard avoiding view which ensures the keyboard does not cover the items on screen */}
<KeyboardAvoidingView
behavior={Platform.OS === "ios" ? "padding" : "height"}
style={styles.writeTaskWrapper}>
<TextInput style={styles.input} placeholder={'Write a task'} value={task} onChangeText={text => setTask(text)} />
<TouchableOpacity onPress={() => handleAddTask()}>
<View style={styles.addWrapper}>
<Text style={styles.addText}>+</Text>
</View>
</TouchableOpacity>
</KeyboardAvoidingView>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: '#E8EAED',
},
tasksWrapper: {
paddingTop: 20,
paddingHorizontal: 20,
},
sectionTitle: {
fontSize: 24,
fontWeight: 'bold',
},
items: {
marginTop: 30,
},
writeTaskWrapper: {
position: 'absolute',
bottom: 20,
paddingLeft: 10,
paddingRight: 10,
width: '100%',
flexDirection: 'row',
justifyContent: 'space-between',
alignItems: 'center'
},
input: {
paddingVertical: 15,
width: 250,
paddingHorizontal: 15,
backgroundColor: '#FFF',
borderRadius: 60,
borderColor: '#C0C0C0',
borderWidth: 1,
},
addWrapper: {
width: 60,
height: 60,
backgroundColor: '#FFF',
borderRadius: 60,
justifyContent: 'center',
alignItems: 'center',
borderColor: '#C0C0C0',
borderWidth: 1,
},
addText: {
},
});
And my Calendar class
import * as React from 'react';
import { View, Text } from 'react-native';
export default function Calendar(){
return(
<View>
<Text>Calendar Will go here</Text>
</View>
)
}
I made a Task component for the ToDoList. Not sure if you need it to solve this but I'll paste it here anyway.
import React from 'react';
import { View, Text, StyleSheet } from 'react-native';
import { TouchableOpacity } from 'react-native-web';
const Task = (props) => {
return (
<View style={styles.item}>
<View style={styles.itemLeft}>
<View style={styles.square}></View>
<Text style={styles.itemText}>{props.text}</Text>
</View>
<View style={styles.circular}></View>
</View>
)
}
const styles = StyleSheet.create({
item: {
backgroundColor: '#FFF',
padding: 15,
borderRadius: 10,
flexDirection: 'row',
alignItems: 'center',
justifyContent: 'space-between',
marginBottom: 20,
},
itemLeft: {
flexDirection: 'row',
alignItems: 'center',
flexWrap: 'wrap',
},
square: {
width: 24,
height: 24,
backgroundColor: '#55BCF6',
opacity: .4,
borderRadius: 5,
marginRight: 15,
},
itemText: {
maxWidth: '80%',
},
circular: {
width: 12,
height: 12,
borderColor: '#55BCF6',
borderWidth: 2,
borderRadius: 5
},
});
export default Task;

It sounds like you are looking for the tabBarStyle property. You should be able to rename style (which is not a supported prop of the tab navigator) to tabBarStyle.
Here's the spot in the docs that mentions this. https://reactnavigation.org/docs/bottom-tab-navigator#tabbarstyle

What I ended up doing to solve this was to put the styling inside the screenOptions. I didn't want to do this because I wanted to separate the styling from the logic, but it solved the problem for me. See code below:
export default function MainContainer() {
return (
<NavigationContainer>
<Tab.Navigator
initialRouteName={ToDoListName}
screenOptions={({route}) => ({
tabBarIcon: ({focused, color, size}) => {
let iconName;
let rn = route.name;
if (rn === ToDoListName) {
iconName = focused ? 'list' : 'list-outline'; //icons in package. Change later.
} else if (rn === calendarName) {
iconName = focused ? 'calendar' : 'calendar-outline'
}
return <Ionicons name={iconName} size={size} color={color}/>
},
activeTintColor: 'tomato',
inactiveTintColor: 'black',
tabBarShowLabel: false,
tabBarStyle: {padding: 10, height: 100, backgroundColor: 'black'},
})}>
<Tab.Screen name={ToDoListName} component={ToDoList}/>
<Tab.Screen name={calendarName} component={Calendar}/>
</Tab.Navigator>
</NavigationContainer>
)
}

How to add information pop-up for TextInput in React Native?

I want to achieve something like this in React Native:
I have a TextInput component and I want to put an icon to the right side. The user can click it, then I can display some text in a modal or in a another component.
Is this possible in react native?
return(
<View style={styles.container}>
<TextInput
placeholder="Állat neve"
value={AllatNev}
style={styles.textBox}
onChangeText={(text) => setAllatNev(text)}
/>
</View>
);
}
)
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: color_theme_light.bodyBackground
justifyContent: 'center',
alignItems:'center'
},
textBox:{
borderWidth:2,
borderColor: color_theme_light.textBoxBorder,
margin:15,
borderRadius:10,
padding: 10,
fontFamily:'Quicksand-Medium'
},
});

Yes -- you can position your info button over the TextInput using absolute positioning and a zIndex, for example:
import * as React from 'react';
import { Text, View, StyleSheet, TextInput, TouchableOpacity } from 'react-native';
export default function App() {
return (
<View style={styles.container}>
<View style={styles.textBoxParent}>
<TextInput style={styles.textBox} placeholder="Állat neve"/>
<TouchableOpacity style={styles.textBoxButton} onPress={() => {
//launch your modal
}}>
<Text>i</Text>
</TouchableOpacity>
</View>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
backgroundColor: '#ecf0f1',
padding: 8,
},
textBoxParent: {
justifyContent: 'center'
},
textBox:{
borderWidth:2,
borderColor: 'gray',
margin:15,
borderRadius:10,
padding: 10,
},
textBoxButton: {
position: 'absolute',
right: 20,
zIndex: 100,
width: 20,
height: 20,
borderWidth: 1,
borderRadius: 10,
justifyContent: 'center',
alignItems: 'center'
}
});
Working example: https://snack.expo.dev/OFMTc8GHE

Heres a full example of what you want (https://snack.expo.dev/bjzBFuE4W). And below I explain the code.
Fist I made a Modal from react native that takes in modalVisible, setModalVisible, and appears when modalVisible is true.
import * as React from 'react';
import { Text, View, StyleSheet,TextInput ,TouchableOpacity,Modal} from 'react-native';
import { AntDesign } from '#expo/vector-icons';
import { MaterialIcons } from '#expo/vector-icons';
const ModalInfo = ({modalVisible, setModalVisible})=>{
return (
<Modal
animationType="slide"
transparent={true}
visible={modalVisible}
onRequestClose={() => {
setModalVisible(!modalVisible);
}}
>
<View style={{
flex: 1,
justifyContent: "center",
alignItems: "center",
}}>
<View
style={{
width:200,height:200,backgroundColor:"gray",borderWidth:2,
justifyContent:"center",alignItems:"center"
}}
>
<TouchableOpacity onPress={()=>{setModalVisible(false)}}>
<MaterialIcons name="cancel" size={24} color="black" />
</TouchableOpacity>
</View>
</View>
</Modal>
)
}
Next I made a View to wrap around the textInput so I can also add an svg of the info icon. And then set the outside view to have flexDirection:"row", so everything would be ordered the way you wan't.
const TextInputWithModal = ()=>{
const [modalVisible, setModalVisible] = React.useState(false);
const [AllatNev,setAllatNev]= React.useState("");
return (
<View style={styles.textInputContainer}>
<TextInput
placeholder="Állat neve"
value={AllatNev}
style={styles.textBox}
onChangeText={(text) => setAllatNev(text)}
/>
<TouchableOpacity onPress={()=>{setModalVisible(true)}}>
<AntDesign name="infocirlceo" size={24} color="black" />
</TouchableOpacity>
<ModalInfo modalVisible={modalVisible} setModalVisible={setModalVisible}/>
</View>
)
}
export default function App() {
return (
<View style={styles.container}>
<TextInputWithModal/>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems:"center",
},
textInputContainer:{
borderRadius:10,
padding: 10,
flexDirection:"row",
margin:15,
borderWidth:2,
},
textBox:{
fontFamily:'Quicksand-Medium',
marginRight:20,
},
});

react-native paper button vector-icons float right

I try to build an accordeonmenu with chevron icons my headerbutton has following code:
const AccordeonHeader = (Props) => {
return(
<View style={[accordionStyles.header]}>
<Button
contentStyle={[accordionStyles.header__button, ]}
color='black'
onPress={() => {show !== Props.value ? setShow(Props.value) : setShow(false)}}
>
<Text
style={[accordionStyles.header__text, styles.headline__h2]}
>
{Props.label}
</Text>
<Icon
iconStyle={[accordionStyles.header__icon,]}
name={show === Props.value ? "chevron-up" : "chevron-down"}
>
</Icon>
</Button>
</View>
);
}
with this styles
const accordionStyles = StyleSheet.create({
header: {
},
header__button: {
width:'100%',
borderColor:'green',
borderWidth:2,
flexDirection:'row',
justifyContent:'space-between',
},
header__text: {
display:'none',
color:'black',
},
header__icon: {
alignSelf:'flex-end',
color:'black',
},
});
but i can't get the icon on the rigth side and the text stay on the left.
its alwayse directly beside.

Update
import * as React from 'react';
import { Text, View, StyleSheet ,Button,TouchableOpacity} from 'react-native';
import Constants from 'expo-constants';
import FontAwesome from "react-native-vector-icons/FontAwesome";
export default function App() {
return (
<TouchableOpacity style={[accordionStyles.header]} onPress={()=>console.log("press")}>
<Text style={{paddingTop:5}}>Sortieren</Text>
<FontAwesome
iconStyle={[accordionStyles.header__icon]}
size={30}
color="#000000"
name={"chevron-up"}
/>
</TouchableOpacity>
);
}
const accordionStyles = StyleSheet.create({
header: {
width: "100%",
borderColor: "green",
borderWidth: 2,
flexDirection: "row",
justifyContent: "space-between"},
header__icon: {
alignSelf: "flex-end",
color: "black"
}
});
Code on snack

its Very Simple just add ,
contentStyle={{flexDirection: 'row-reverse'}}
and our icon moves to right side