How to disable return login in uniapp

With the rapid development of mobile applications, more and more companies and individuals are beginning to choose to use mobile applications as their main business platform. Among them, uniapp, as a cross-platform development framework, is favored by many developers. uniapp can develop applications for both Android, iOS and other platforms, and has extremely high cross-end performance. It is known as another development artifact after H5.

However, there are also many problems in the development of uniapp applications. Among them, the problem of prohibiting the application from returning to the login interface has become a problem that the majority of developers need to face.

For uniapp applications, usually we hope that users will remain logged in in the application after registering and logging in. Only when the user actively logs out or does not perform any operations within a certain period of time, will the user automatically log out. Log in. In this way, the user can log in once and be online throughout the entire process.

Therefore, many developers will choose to add code to determine whether to log in and jump to the application, and display different pages under different circumstances. In order to prevent users from returning to the login interface through the back button in the upper left corner to log in again when they are already logged in, the application must disable the "Back" button. This requires us to control it in the application.

Next, we will introduce how to prevent users from returning to the login interface through the return button in the upper left corner in the uniapp application.

1. Method 1: Monitor page jump events

We can use the navigation bar settings provided by uniapp to define return events ourselves and prohibit users from returning freely.

// 在需要禁止用户返回的页面定义参数disableBack为true
<template>
  <div>
    <nav-bar :title="title" :left-text="disableBack ? &#39;&#39; : &#39;返回&#39;" :right-text="rightText" @click-left="handleClickLeft"></nav-bar>
    <div>{{content}}</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      title: '主页',
      content: '示例内容',
      disableBack: true
    }
  },
  methods: {
    handleClickLeft() {
      if (!this.disableBack) {
        uni.navigateBack({
          delta: 1
        })
      }
    }
  }
}
</script>

By defining a disableBack parameter as true, you can determine whether the user is operating on the current page. If so, the event returned by the user through the return button in the upper left corner will not trigger a jump. It should be noted that this method only works when the "Back" button is re-rendered, and if the page is destroyed, such code needs to be added again.

2. Method 2: Disable global settings and return to login

In the uniapp application, we can monitor routing changes in the App.vue file and only need to determine whether the current It is a login page. If so, no routing jump operation will be performed. The code is as follows:

// 在App.vue中监听路由变化，判断是否返回登录
<template>
  <div class="app">
    <router-view></router-view>
  </div>
</template>

<script>
export default {
  onRouteChange(to, from) {
    // 判断是否为登录页面
    if (to.path === '/login') {
      let pages = getCurrentPages()
      let loginPage = pages[pages.length - 1]
      if (loginPage) {
        loginPage.onLoad()
      }
      return false
    }
  }
}
</script>

In this method, we only need to determine whether the current route is a login page in the App.vue method. If so, return false directly, and there is no need to worry about the destruction and reconstruction of the component. .

To sum up, in uniapp, we can choose different methods according to actual needs to implement the function of prohibiting return to login. But it should be noted that we should take special circumstances into consideration as much as possible in practice to ensure the stability of the application and the user experience.

Let us work together to explore, continuously optimize and improve the development innovation and experience of uniapp applications, and bring a better experience to users.

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