How does uniapp achieve positioning?

Uniapp is a cross-platform application development framework that can quickly build applications for different platforms. In Uniapp, it is also very simple to implement the positioning function, which can be easily implemented with only simple configuration.

1. Preparations for implementing positioning in Uniapp

Before implementing positioning, you need to introduce the positioning plug-in that comes with uni-app into the project. You can pass the "AppManifest" in manifest.json Add the "permissions" and "plugins" attributes under the "node, and add the "location" plug-in to implement:

{
"AppManifest": {

"permissions": ["android.permission.ACCESS_FINE_LOCATION"],
"plugins": {
  "location": {
    "version": "1.1.0",
    "provider": "uni.plugin.location"
  }
}

}
}

At the same time, you also need to understand several important configuration files in uni-app:

• manifest.json: App’s manifest file, in this file you can configure your application Name, icon, permissions, modules, etc.
• App.vue: The entry file of the application, usually a container, which contains all views and components of the application.
• main.js: The startup file of the application, which contains Vue’s initialization code and other global configurations.
• uni.scss: The style file of uni-app. You can define the global style of the application here.

2. Obtaining location information

The method of obtaining location information has been encapsulated in the built-in location plug-in of uni-app, and can be obtained directly by calling the getLocation() function. This function accepts two parameters:

• type: indicates the positioning type. You can pass in "wgs84" or "gcj02" to indicate the type of coordinate system to be obtained.

• success: The callback function after the positioning information is successfully obtained. The parameters inside the function are:

  • longitude: longitude
  • latitude: latitude
  • address: detailed address
  • country: country
  • province: province
  • city: city
  • district: district and county
  • street: street

At the same time, Before obtaining positioning information, it is necessary to determine whether the user authorizes the application to use the positioning function. User authorization can be requested by calling the uni.authorize() function. The sample code is as follows:

uni.authorize({
scope: 'scope.userLocation',
success() {

// 用户授权成功

},
fail() {

// 用户拒绝授权

}
})

3. Display the positioning information on the page

Obtain the positioning information After that, it can be displayed on the page. You can use Vue's data binding syntax to render the obtained information such as longitude, latitude, and detailed address on the page.

On the page, you can use the components provided in uni-app, such as view, text, image, etc., to display positioning information.

If you want to display geographical location information on the map, you can use the built-in map component of uni-app and set the center and markers attributes to determine the center and marker location of the map.

In general, it is very simple to use uni-app to implement positioning functions. Just introduce the location plug-in and call the getLocation() function to obtain the location information.

At the same time, although the positioning function is simple to implement, it should not be used casually when considering user privacy. In addition, user authorization, mobile phone model and other factors must also be considered to make the function more complete.

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