Taro Vue WeChat mini program PX unit adaptation failed: How to solve the problem of inconsistent page layout of different models?

Taro Vue WeChat applet: Detailed explanation of px unit adaptation and layout confusion

The Taro framework recommends using px as the size unit for WeChat applet development, but in actual applications, many developers encounter a difficult problem: using px units on different devices will cause the page layout to be confused and adaptable. For example, setting the element height to 297px will be displayed as 297px on all devices (equivalent to 594rpx), resulting in inconsistent display effects under different screen sizes.

This article analyzes and solves this problem. The sample code in this article shows the configuration of the index.js file, including adaptive configurations such as designWidth (design draft width is 375) and deviceRatio , but these configurations do not completely solve the problem.

The core of the problem lies in the misunderstanding of the px unit in Taro. Taro uses px as the design draft unit, but it does not automatically convert px to other units to suit different screen sizes. Taro's pxtransform plugin is responsible for converting px to rpx, and the conversion is based on designWidth (375px). This means that if the design draft is based on the width of iPhone 6 (375px), on other devices with screen width, although rpx will change, the element size using the px value will not change as the screen size changes.

Therefore, to achieve adaptation of page elements, it is not feasible to use px units directly. It is recommended to use vh (viewport height) or calc() function. vh represents the percentage of viewport height, while the calc() function allows for more complex calculations, allowing dynamic calculation of element sizes based on screen width and height, thus achieving more flexible layout adaptation. Through vh or calc() function, page elements can maintain consistent visual effects under different screen sizes, avoiding layout confusion.

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