react-native

问题 I want to fetch data from API and show frontend using react but I am getting error from frontend side which is (TypeError: answers.map is not a function ) so how can I solve this error -- MY CODE IS - import React, { useState, useEffect } from "react"; import Poll from "react-polls"; import { getPolls } from "../helper/coreapicalls"; const MainPoll = () => { const [polls, setPoll] = useState([]); const [error, seterror] = useState(false); // Setting answers to state to reload the component

问题 I have a textStyle which is a type of TextStyle (it comes from react-native types) or React.CSSProperties. I want to pass this type to style attribute for html span element. style attribute accepts type of React.CSSProperties. My interface and span element is: export interface IBaseTextStyleType { textStyle: React.CSSProperties | TextStyle } <span style={style.textStyle}> {this.props.children || this.props.text} </span> I got this error in style of span: Type 'CSSProperties | TextStyle' is

问题 I have a textStyle which is a type of TextStyle (it comes from react-native types) or React.CSSProperties. I want to pass this type to style attribute for html span element. style attribute accepts type of React.CSSProperties. My interface and span element is: export interface IBaseTextStyleType { textStyle: React.CSSProperties | TextStyle } <span style={style.textStyle}> {this.props.children || this.props.text} </span> I got this error in style of span: Type 'CSSProperties | TextStyle' is

问题 I'm getting data from firebase databse in console that look like this. [{ "isDonor": true, "name": "Nadi", "photo": "https://gre", "uid": "2ZE" }, { "email": "mmaz", "isDonor": true, "name": "Mz", "photo": "https://gra", "uid": "Cb" }] I want to create cards of each objects but how to accomplish that as data is fetched after some time? I want to render it like this Ihave checked other answres but they are mostly from class component. I have tried using useEffect hook but couldn't implement it

问题 I am new to react native. I have created An app. In this app when User login he get a data through API. for example = userID = 1, userName = abc. so I want to save that data in session storage or local storage in app. and I want to use it after for posting my form data to server. for example when user looged in he get ID that is 1 and when It goes to Form screen and submit the form then. I want to send that userID through API to server means in database. here is my login screen import React,

问题 When I am in the login screen I would like once the user logs in that it is also redirected to the 'Home' screen but currently, I have an error telling me that the Home is not defined what is normal ... {isAuth ? ( <BottomTab.Screen name='Home' component={Home} /> ): ( <> <BottomTab.Screen name='Connexion' component={Login} /> <BottomTab.Screen name='Inscription' component={Register} /> </> I don't really know how to use contexts yet but I think it might simplify the thing but in the meantime

问题 I tried to import OpenCV via native code but that not worked and I also tried react-native-opencv library but that library doesn't contain all OpenCV methods. How can I achieve to use OpenCV in my react-native project? Thanks in advance. 回答1: I have been struggling with OpenCV in react-native for a week now and finally got it working. There is this very good article https://brainhub.eu/blog/opencv-react-native-image-processing/ together with this repo https://github.com/brainhubeu/react

问题 I have a ScrollView which has two children, and I want each of the children to be the full height of the available space on the screen, meaning view 1 fills the whole screen, and then I scroll down to start to see part of slide 2. If I scroll all the way down, I should only see slide 2. I can't figure out how to get this to happen. What is currently happening is that each child is filling half of the available vertical space, so I don't get any scrolling. Any ideas how I can achieve this

问题 I am trying for few hours but can't figure out why my state is not called after adding an array of custom object . // In my component... const myRemoteArray = getRemoteArray() // Is working props.addAdItems(myRemoteArray) // Calls **1 via component.props /// ... const mapDispatchToProps = (dispatch) => { return { addAdItems: (items) => { // **1 // Items contains my array of objects dispatch(addAdItems(items)) // Calls **2 }, } } // My action export const addAdItems = (items) => { // **2 //

问题 Push Notification function: PushNotification.configure({ largeIcon: "ic_launcher", smallIcon: "ic_notification", onNotification: function (notification) { PushNotification.localNotification({ autoCancel: true, message: 'Test Message', title: 'Test Message', vibrate: true, vibration: 300, playSound: true, soundName: 'default' }) console.log(notification) }, }); Problem: When I run application, if I send notification from php server I am getting response in console.log but condition 1: