How uniapp adapts to the mobile screen

With the popularity of mobile devices, cross-platform development frameworks have attracted more and more attention from developers, and uniapp is one of the excellent cross-platform development frameworks. However, before using uniapp for development, we need to understand how to adapt to the mobile screen. This article will introduce in detail how uniapp adapts to the mobile phone screen from the following three aspects.

1. Understand the size units in uniapp

uniapp supports four commonly used size units: px, rpx, vw, vh. Among them, px is the most basic and commonly used size unit, which represents physical pixels. The default unit of CSS is also px. rpx is a unit relative to the screen width, and 1rpx is equal to 1px in the design draft. vw and vh represent the percentage of the viewport width and height respectively. In design, we can use these units flexibly to adapt to different screen sizes.

2. Use flex layout

In uniapp, we can use flex layout for typesetting. Compared with traditional floating and positioning layouts, flex layout is more flexible, easier to use, and better adaptable. In flex layout, we can set the width of the element as a percentage, so that it can be adapted to different screen sizes. At the same time, in some cases, we can set the flex-grow attribute of the element so that the element automatically expands when the remaining space is available, thereby utilizing screen space and improving user experience.

3. Use the tool functions that come with uniapp

Uniapp provides many tool functions that can easily adapt to different screen sizes. For example, uni.getSystemInfoSync() can obtain relevant information of the current device, such as screen width, height, pixel ratio, etc. We can use this information and combine it with js to calculate the width, height and other attributes of the elements that need to be set to achieve adaptive layout. At the same time, uniapp also provides tool functions such as uni.upx2px and uni.px2upx, which can convert the dimensions in the design draft into appropriate pixel values ​​to adapt to different screen resolutions.

Summary:

This article introduces in detail how uniapp adapts to different screen sizes from three aspects: size unit, flex layout and uniapp tool function. For cross-platform development, adapting to different screen sizes is an essential issue. It is hoped that developers can use the above methods to implement more intelligent and beautiful applications and improve user experience.

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