How to set the relative size of pictures in uniapp

With the development of mobile Internet, APP has become an indispensable part of modern people's life. As a cross-platform development framework, uniapp has become the first choice of many developers. In uniapp, setting the relative size of pictures is particularly important. This article will introduce how to set the relative size of pictures in uniapp.

1. The basic method of setting the image size in uniapp

The most basic method to set the image size in uniapp is to use the style attribute. We can use it to set the width, height and other properties of the image. For example:

<template>
  <div>
    <img  src="/static/imghwm/default1.png" data-src="yourImage.jpg" class="lazy" alt="How to set the relative size of pictures in uniapp" >
  </div>
</template>

In the above code, we set the width of the image to 50% (relative to the width of the parent element), and the height is adaptive. This method is suitable for use when the size of the image is known in advance, but in actual situations, it is difficult for us to know the size of the image in advance. So, in this case, we can use two methods to solve it.

2. Use flex layout

In the actual development process, we are more accustomed to using flex layout, which can adapt to various screen widths and heights. The following is an example of using flex layout:

<template>
  <div>
    <img  src="/static/imghwm/default1.png" data-src="yourImage.jpg" class="lazy" alt="How to set the relative size of pictures in uniapp" >
  </div>
</template>

We adopt the flex layout of the parent container so that it occupies the width and height of the entire screen, and then use the max-width and max-height attributes to limit the maximum width and height of the image. height, and use margin: auto to center it on the page. In this way, images can adapt to various screen sizes.

3. Use the aspectFit attribute

If you are using the nvue framework of uniapp, you can use the aspectFit attribute to set the image size. The aspectFit property automatically resizes the image to fit the given space, maintaining its original aspect ratio. For example:

<template>
  <div>
    <image></image>
  </div>
</template>

In the above code, we put the image in a div container, and use the image component provided by nvue to set its mode attribute to aspectFit. This method is also a better picture adaptation solution.

Summary

This article introduces several methods to set the relative size of pictures in uniapp. Using these technologies, developers can more easily implement image adaptation and size control, improving the user experience and display effect of the APP. Of course, in the process of using these methods, developers should apply them flexibly according to actual needs.

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