What should I do if local pictures in uniapp are not displayed?

With the popularity of mobile terminal development, uniapp is very popular as a cross-platform development tool. But during the development process, we may encounter the problem that local images are not displayed. This article will introduce some possible reasons why local images are not displayed, and how to solve these problems.

1. The local image path is set incorrectly

In uniapp, the setting method of the local image path is slightly different from that in web development. In web development, we usually use relative paths or absolute paths to load images. In uniapp, the official provides a special local image path setting method, which uses the "@" symbol to represent the project root directory, as shown below:

<img  src="/static/imghwm/default1.png" data-src="'@/static/image/example.jpg'" class="lazy" alt="What should I do if local pictures in uniapp are not displayed?" >

If the path is set incorrectly, the image will not be displayed. In order to avoid problems with path settings, we can use the "select picture" function that comes with the development tool to directly select the picture in the project to generate the correct path.

2. Image formats are not supported

During the development process, we may choose some less popular image formats, such as WEBP format, etc., and these formats are not supported by all devices. If an unsupported image format is used, the image cannot be displayed even if the path is set correctly.

The solution is to use common image formats, such as JPG, PNG, etc. Of course, if we must use an unusual format, we can use conditional statements to make judgments when loading images, as shown below:

<img  src="/static/imghwm/default1.png" data-src="isWebpSupported()? '@/static/image/example.webp' : '@/static/image/example.jpg'" class="lazy" alt="What should I do if local pictures in uniapp are not displayed?" >

3. Image file damage

During the file transfer process , the image file may be damaged, which will cause the image to not be displayed. Usually, we can check whether the picture is damaged by the following methods:

1. Use a picture viewer to open the file on the computer and check whether the file can be displayed normally.

2. Open the image link in the browser and check whether it can be displayed normally.

3. Copy the picture to another folder and try to open it.

If it is determined that the image file is damaged, then we can only re-obtain the image file.

4. Image file size is too large

In mobile development, we need to consider the performance and bandwidth of the device. If we use too large image files, the device will need to consume more resources to load and display the images, which will cause application lags and increase user waiting time.

To avoid this situation, we should compress the image file size as much as possible. When processing image files, we can use some compression tools, such as TinyPNG, etc., to compress the image files to a smaller size, ensuring that the images load quickly and display smoothly on mobile devices.

In general, uniapp is a very excellent cross-platform development tool, but the problem of local images not being displayed often occurs during the development process. When we encounter this problem, we should investigate the possible causes of the problem one by one and take appropriate solutions to solve the problem.

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