我有一个组件,它从api中获取数据,然后在屏幕上显示数据。我想知道的是,如何延迟在屏幕上显示文本直到api调用完成?
例如:
Your Balance is ____
网络呼叫解决后
Your Balance is 500
但是,"Your Balance is"会在组件呈现后立即显示。
import React, { Component, PropTypes } from 'react'
import {StyleSheet, View, Text} from 'react-native'
export default class Main
这是在RN 0.62.2和Nodejs 12.18.0上的新安装。yarn添加react-native-keychain后,npx react-native run-android的应用启动失败,错误如下: error Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup. Run CLI with --verbose flag for more details.
Error
我使用命令“react原生运行-android”运行这个应用程序,它起了作用。但是在使用用户登录信息登录应用程序之后,它会显示黑色的错误屏幕,下面是错误消息。
ERROR TypeError: undefined is not a function
This error is located at:
in Drawer (created by DrawerView)
in DrawerView (created by Navigator)
in Navigator (created by SceneView)
in SceneView (created
正在尝试将RN与Firebase集成。显然,我得到了下一个错误: Cannot find a version of 'com.squareup.okhttp3:okhttp' that satisfies the version constraints:
Dependency path 'getnow:react-native-firebase:unspecified' --> 'com.facebook.react:react-native:0.57.7' --> 'com.squareup.okhttp3:okh
我在React Native代码中有这样的代码: import React, {useState} from 'react';
import {View, StyleSheet} from 'react-native';
import {Text} from 'react-native-paper';
import {TextInput} from 'react-native-p
当我想运行我的反应本机项目时,我会得到这个错误。这是在github,在我克隆之前,它是工作的。
Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081
FAILURE: Build failed with an
App.js
import React,{ Component } from 'react';
import { StyleSheet,TextInput, View, Button, Text } from 'react-native';
import Toast from 'react-native-simple-toast';
import TextItem from '.src/Components/Textviews/TextViewDisplay';
export default class App extends