Let’s talk about the implementation of UniApp custom methods

UniApp is a cross-platform application development framework that uses Vue.js as the front-end framework. It can quickly generate iOS, Android, H5 and other applications based on a set of codes. But for some special needs, you may need to customize some methods to meet business logic. This article will introduce the implementation of UniApp custom methods.

1. Global and local methods

In UniApp, you can define your own methods in a global or local way. Global methods can be used on any page, while local methods can only be used on the current page or component.

1.1 Global method

In the main.js file, you can define a Vue prototype method so that it can be called globally. For example, we can define a method named $toast to display prompt information.

// main.js

import Vue from 'vue'
import App from './App'

Vue.config.productionTip = false

Vue.prototype.$toast = function(message) {
  uni.showToast({
    title: message,
    icon: 'none'
  })
}

App.mpType = 'app'

const app = new Vue({
  ...App
})
app.$mount()

In the above code, we use Vue’s prototype object to define a method named $toast. This method accepts a string type parameter message, which is used to display prompt information.

In the page, we can call this method at any time through this.$toast(message), for example:

<template>
  <view>
    <button @click="showToast">显示提示信息</button>
  </view>
</template>

<script>
export default {
  methods: {
    showToast() {
      this.$toast('这是一条提示信息')
    }
  }
}
</script>

1.2 Local method

Local methods are methods defined in a single page or component and can only be used in the current page or component. For example, in a component named my-component, we define a method named submitForm:

<template>
  <view>
    <button @click="submitForm">提交表单</button>
  </view>
</template>

<script>
export default {
  methods: {
    submitForm() {
      // 提交表单逻辑
    }
  }
}
</script>

In this component, we can This method is called, for example, when the submit button is clicked. This method is not accessible from other pages or components.

2. Mixin mixing

mixin is a method provided by Vue.js to reuse code. It can mix some common logic into multiple components so that Reuse. In UniApp, we can also use mixin to define custom methods.

For example, we create a mixed object named myMixin, which contains a method named $alert to display the pop-up prompt:

// mixins/myMixin.js

export default {
  methods: {
    $alert(message) {
      uni.showModal({
        title: '提示',
        content: message,
        showCancel: false
      })
    }
  }
}

To use this mixin object in a component, you only need to add it to the mixins attribute of the component. For example, if we use the myMixin mixed object in a component named my-component, we can directly call the $alert method to display the pop-up prompt:

<template>
  <view>
    <button @click="showAlert">显示弹窗提示</button>
  </view>
</template>

<script>
import myMixin from '@/mixins/myMixin'

export default {
  mixins: [myMixin],
  methods: {
    showAlert() {
      this.$alert('这是一条弹窗提示信息')
    }
  }
}
</script>

3. Summary

UniApp’s custom methods can be implemented in many ways, including global methods, local methods, and mixinmixed objects, etc. Different implementation methods can be chosen for different scenarios to meet business needs. In actual development, we can flexibly use UniApp custom methods according to specific business conditions to improve development efficiency and code reusability.

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