react-native中timer的注意点

本文介绍了ReactNative中定时器导致的应用闪退问题及其解决方案。强调了在组件卸载前清除定时器的重要性,并提供了具体的代码实现。

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务必在卸载组件前清除定时器!
我们发现很多 React Native 应用发生致命错误(闪退)是与计时器有关。具体来说,是在某个组件被卸载(unmount)之后,计时器却仍然在运行。要解决这个问题,只需铭记在unmount组件时清除(clearTimeout/clearInterval)所有用到的定时器即可:


import React, { Component } from "react";

export default class Hello extends Component {
  componentDidMount() {
    this.timer = setTimeout(() => {
      console.log("把一个定时器的引用挂在this上");
    }, 500);
  }
  componentWillUnmount() {
    // 请注意Un"m"ount的m是小写

    // 如果存在this.timer,则使用clearTimeout清空。
    // 如果你使用多个timer,那么用多个变量,或者用个数组来保存引用,然后逐个clear
    this.timer && clearTimeout(this.timer);
  }
}

转载于:https://www.cnblogs.com/smart-girl/p/10648664.html

我的项目是react native0.68版本的react-native-sunmi-inner-printer这个依赖需要那个版本能够兼容我的项目 以下是我的json文件中的一段 "dependencies": { "@ant-design/icons-react-native": "^2.3.2", "@ant-design/react-native": "^5.0.1", "@react-native-async-storage/async-storage": "^1.19.0", "@react-native-community/cameraroll": "^4.0.0", "@react-native-community/masked-view": "0.1.11", "@react-native-community/segmented-control": "^2.1.1", "@react-native-community/slider": "^3.0.3", "@react-native-community/viewpager": "^4.1.6", "@react-native-picker/picker": "^1.16.8", "@react-navigation/native": "^6.1.7", "@react-navigation/native-stack": "^6.9.12", "@rneui/base": "^4.0.0-rc.7", "@rneui/themed": "^4.0.0-rc.8", "@taoqf/react-native-mqtt": "^3.0.4", "d3-shape": "^1.3.7", "minio": "^7.0.15", "react": "17.0.2", "react-dom": "^17.0.2", "react-native": "0.68.0", "react-native-background-timer": "^2.4.1", "react-native-device-info": "^8.1.3", "react-native-elements": "^1.2.7", "react-native-exception-handler": "^2.10.10", "react-native-fs": "^2.18.0", "react-native-gesture-handler": "^1.10.3", "react-native-get-location": "^2.1.0", "react-native-get-random-values": "^1.4.0", "react-native-image-picker": "^3.8.1", "react-native-image-zoom-viewer": "^3.0.1", "react-native-linear-gradient": "^2.8.3", "react-native-modal-dropdown": "^1.0.2", "react-native-permissions": "3.8.0", "react-native-reanimated": "2.14.4", "react-native-safe-area-context": "3.3.2", "react-native-screens": "3.15.0", "react-native-signature-canvas": "^4.1.0", "react-native-signature-capture": "^0.4.12", "react-native-sound": "^0.11.1", "react-native-sqlite-storage": "^4.1.0", "react-native-svg-charts": "5.4.0", "react-native-table-component": "^1.2.2", "react-native-thermal-receipt-printer": "^1.2.0-rc.2", "react-native-vector-icons": "^9.2.0", "react-native-web": "^0.17.1", "react-native-webview": "^11.26.0", "react-redux": "^7.2.0", "redux": "^4.0.5", "redux-thunk": "^2.3.0" }, 我需要安装react-native-sunmi-inner-printer那个版本才能兼容我的项目,安装这个react-native-sunmi-inner-printer能够兼容的版本后还需不需要其他的依赖一块来安装。
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08-02
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