uniapp fonts and icons are not horizontal

When I was developing a Uniapp application recently, I encountered a strange problem, that is, the fonts and icons were not displayed horizontally on some devices. This problem bothered me very much because it appeared normal on my device but had problems on other devices. After several days of research and debugging, I finally found the cause and solution.

Problem Description

First, let’s take a look at the performance of this problem. On my development device, as shown in the picture below, the fonts and icons are displayed normally without any problems.

However, when I installed the app on other Android devices, something went wrong. As shown in the picture below, you can see that neither the font nor the icon is horizontal. The bottom of the font is tilted to the left and the bottom of the icon is tilted to the right.

The occurrence of this problem affects the overall aesthetics of the application, and also causes great trouble for some UI designs that require fine layout.

Problem Analysis

Next, let’s analyze the cause of this problem. After my debugging and research, I found that this problem is mainly caused by the resolution and pixel density of the device.

On my own device, the resolution is 1080x1920 and the pixel density is 440dpi. On other test devices, resolution and pixel density will vary. Because fonts and icons are displayed based on pixels, the same font size and icon size will appear in different sizes on devices with different resolutions and pixel densities. Moreover, different anchor points of fonts and icons will also cause deviations in their bottom alignment.

Solution

Next, let’s discuss how to solve this problem. After my research and exploration, I summarized the following solution ideas.

1. Use vector icons

Vector icons (Vector icons) are icons based on digital description graphics. They are different from bitmap icons (Bitmap icons) and can be used at any resolution and Maintain clarity and consistency at pixel density. Using vector icons avoids problems with icon size and position deviation caused by different resolutions and pixel densities.

The use of vector icons in Uniapp requires the use of third-party libraries (such as fontawesome, ionicons, etc.). By introducing the icon files in the library, the corresponding icons can be displayed on the page using their corresponding class names. For specific usage, please refer to the documentation of the relevant third-party libraries.

2. Use flex layout

Flex layout is a new layout method in CSS3, which allows the labels in the container to flexibly adjust the size, spacing and position, solving problems caused by resolution and Typesetting problems caused by different pixel densities. Uniapp also supports the use of flex layout. You can set the layout mode of the parent container to flex, and the size and position of the child labels can be achieved by setting their flex properties.

3. Use pixel units

In Uniapp, the default unit of labels is rpx (responsive pixel), which is a unit that is adaptive according to the pixel density of the device, but in some cases Next, using pixel units (px) will be more accurate and reliable. Because the pixel unit is not affected by the pixel density of the device, you can avoid typography problems on devices with different resolutions and pixel densities.

Conclusion

The above is my analysis and solution to the problem of uneven fonts and icons in Uniapp applications. After several days of my efforts, I finally found a way to solve this problem and successfully applied it to my app. Now my app can display beautiful typography on various devices. I hope this article can help other developers who are encountering the same problem.

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