uniapp determines whether the screen is horizontal or vertical

On mobile devices, different screen orientations may correspond to different display effects. Therefore, developers need to make relevant screen orientation judgment and processing in the application. Under the uniapp framework, we can use the API provided by uniapp to determine whether the screen is horizontal or vertical.

1. Use the API provided by uniapp to determine the screen orientation

uniapp provides a uni.getSystemInfo API that can be used to obtain the system information of the device, including the current orientation of the device screen. The specific implementation is as follows:

// 获取系统信息
const systemInfo = uni.getSystemInfoSync();
// 设备屏幕宽度
const screenWidth = systemInfo.screenWidth;
// 设备屏幕高度
const screenHeight = systemInfo.screenHeight;
// 设备屏幕方向
const orientation = screenWidth > screenHeight ? 'landscape' : 'portrait';

By obtaining the system information of the device, we can obtain the screen width and height of the device, and compare the two values ​​to determine the screen orientation of the current device.

2. Perform related processing according to the screen orientation

After obtaining the device screen orientation, we can perform related processing through the corresponding methods. The following are some common processing methods:

1. When the device is in landscape mode, we can disable the vertical scrolling of the page and add some horizontal elements to the page to make the page display more reasonable.

if (orientation === 'landscape') {
  // 禁用竖屏滚动
  document.body.style.overflow = 'hidden';
  // 页面横向排列
  document.body.style.flexDirection = 'row';
}

2. When the device is in portrait mode, we can restore the vertical scrolling of the page and adjust the arrangement of page elements back to vertical.

if (orientation === 'portrait') {
  // 恢复竖屏滚动
  document.body.style.overflow = '';
  // 页面竖向排列
  document.body.style.flexDirection = 'column';
}

3. In uniapp development, we can also use vue's calculated attribute Watcher to layout the page responsively, thereby achieving adaptive layout in different screen directions.

export default {
  data() {
    return {
      screenWidth: '',
      screenHeight: '',
    }
  },
  computed: {
    isLandscape() {
      return this.screenWidth > this.screenHeight;
    },
    containerStyle() {
      return {
        flexDirection: this.isLandscape ? 'row' : 'column',
        // 其他布局样式
      }
    }
  },
  methods: {
    handleResize() {
      const systemInfo = uni.getSystemInfoSync();
      this.screenWidth = systemInfo.screenWidth;
      this.screenHeight = systemInfo.screenHeight;
    },
  },
  mounted() {
    // 监听窗口改变
    window.addEventListener('resize', this.handleResize, false);
    this.handleResize();
  },
  unmounted() {
    window.removeEventListener('resize', this.handleResize, false);
  }
}

Through the above code, we can manage the page in a responsive layout and dynamically change the page arrangement according to changes in screen orientation, thereby achieving more flexible layout operations.

3. Summary

In general, in uniapp development, we can use the system API provided by uniapp to obtain the device screen direction, and then process the page accordingly according to the specific situation. When implementing adaptive layout in different screen directions, we can use vue's calculated attribute Watcher to layout the page responsively, thereby greatly improving development efficiency and code quality.

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