Why does Uni-app only display three views?

uniapp only allows three views to be displayed

With the continuous development of mobile applications, front-end developers have an increasing demand for cross-platform development solutions. Uni-app, as a cross-platform framework based on Vue.js, has been widely used. However, you may encounter some strange problems during development with Uni-app. For example, today we are going to discuss a question: Why does Uni-app only allow three views to be displayed?

Description of the problem

During the development process using Uni-app, developers may find that Uni-app only allows the display of three view. This seems like a very strange question, because such a restriction is very inconvenient during daily development.

Cause of the problem

First of all, we need to understand the architecture of Uni-app. Uni-app provides cross-platform development capabilities based on Vue.js, and is compatible with WeChat mini programs, Alipay mini programs, H5, App and other platforms. In the Uni-app stage, each component is encapsulated into a format similar to Web Components. Each component needs to register a view container, and this view container is a basic component provided by Uni-app itself. This basic component is called Uni-view.

The reason for the problem comes from the implementation of the Uni-view component. Uni-view is a container component. It does not draw page content by itself, but is responsible for displaying sub-components. Since Uni-view components need to be stable on different platforms, in terms of implementation, Uni-view only draws a container and does not draw anything in the container. Therefore, when viewing the Uni-app page in the simulator or real device, only the first three components included in the container will be drawn.

Solution

So, how should we solve this problem?

Option 1: Use a component similar to ScrollView

If you need to display many views, you can use a component similar to ScrollView. In Uni-app, you can use the scroll-view component to achieve the scrolling effect.

Option 2: Render into the same view container

When the number of view containers exceeds three, we can consider rendering all components into the same view container. In this way, we only need to render a view container in the main component, and then add all child components to this container.

Option 3: Wait for the data to be loaded before displaying

In many cases, we can wait for the data to be loaded before displaying the UI interface. In this way, only the necessary UI is displayed when the page is first loaded, and the complete UI is displayed after the data is loaded.

Summary

During the development process of Uni-app, some problems may make developers very distressed. For example, today we discussed why Uni-app only allows three views to be displayed. This problem arises mainly because of the way the Uni-view component is implemented. There are many solutions to this problem, and developers can choose the most appropriate method according to the actual situation. I hope this article can bring some help to Uni-app developers.

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