Explore how UniApp sets the width of components

Recently, with the wide application of UniApp in development, some issues about style setting have bothered many developers. One of the more common questions is "How does UniApp set the width of the component". This article will explore this problem and provide a solution.

In Vue.js, we can use the style attribute to set the CSS style of the component. Similarly, we can also use the style attribute in UniApp to set the CSS style of the component. Regarding the width issue, we can usually use the width attribute to set the width of the component. The sample code is as follows:

<template>
  <view class="container">
    <view class="box" style="width:200rpx;height:200rpx;"></view>
  </view>
</template>

<style>
  .container {
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .box {
    background-color: red;
  }
</style>

With the above code, we can create a box with a width and height of 200rpx and center it in displayed on the page. to

It should be noted that the unit in UniApp is different from the pixel in web development, but rpx (responsive pixel) is used. On different devices, rpx will scale according to the size of the screen to ensure that the effect displayed on different screens is consistent.

In addition to setting the width value directly in the style attribute, we can also use binding syntax to dynamically set the width. If we need to adapt the width according to the content of the component, we can use width:auto, the code example is as follows:

<template>
  <view class="container">
    <view class="content" :style="&#39;width:&#39; + width + &#39;;height:200rpx;&#39;">
      <text class="text">{{content}}</text>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        content: '这是一段很长的文本，我们需要让组件自适应宽度。',
        width: ''
      }
    },
    mounted() {
      let query = uni.createSelectorQuery().in(this);
      query.select('.text').boundingClientRect((res) => {
        // 获取text组件的宽度，并设置content的宽度
        this.width = res.width + 'px'
      }).exec();
    }
  }
</script>

<style>
  .container {
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .content {
    background-color: gray;
    padding: 10rpx;
  }
</style>

In the above example code, we wrap the text in a view component , and set the width to auto. Then, we use the mounted hook function to get the width of the text component and bind it to the style attribute of the content component so that the component can adapt to the width.

Both of the above methods can effectively set the width of the UniApp component. Through settings for different scenarios, we can flexibly adjust the width of the component and create a variety of unique UI effects.

In short, setting the width of the component in UniApp is very simple. We only need to use the style attribute and set it in conjunction with the rpx unit. Whether it is static settings or dynamic settings, we can easily cope with development needs in different scenarios.

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