Uniapp live streaming switch camera flip

Uniapp is an open source framework based on Vue.js, which allows developers to easily build and publish applications on multiple platforms. Among them, Uniapp's live streaming function is very powerful and can meet the needs of many live streaming applications. In this article, we will discuss how to implement the function of switching camera and flipping in Uniapp.

1. Push-stream switching lens

In Uniapp, if we want to implement push-stream switching lens, we need to use the camera-context in the uni-mp push component. This is a context object used to interact with the camera, through which we can access various properties and operations of the camera.

1. Get the camera context

First, we need to get the camera context object. In the vue page, we can obtain the camera context object in the following way:

<camera id="camera" @ready="onCameraReady"></camera>

import { getCameraContext } from '@/js_sdk/wechat-weapp-miniprogram/uni-mp-weixin/dist/index.js';

export default {
  data() {
    return {
      cameraContext: null
    }
  },
  methods: {
    onCameraReady(e) {
      this.cameraContext = getCameraContext('#camera');
      // ...
    }
  }
}

In the above code, we first create a camera component in the page and obtain the camera context object through the onCameraReady event. In the onCameraReady event, we call the getCameraContext function to obtain the camera context object and save it in the cameraContext property in data.

2. Switch lenses

Next, we can switch lenses through the camera context object. Specifically, we can call the cameraContext.switchCamera method to switch camera lenses. By passing different parameters, this method can switch the front lens and the rear lens.

switchCamera() {
  if (!this.cameraContext) {
    return;
  }

  this.cameraContext.switchCamera({
    success: () => {
      // ...
    },
    fail: err => {
      console.log(err);
    }
  })
}

In the above code, we first determine whether the camera context object exists. If it exists, call the switchCamera method to switch the camera. In the callback function of the switchCamera method, we can perform some processing based on the results of the operation.

2. Flip

In addition to switching lenses, we can also implement the flip function in Uniapp. In the flip function, we need to use the cover-view and cover-image components in the uni-mp component library. The cover-view component is used to cover an area on the page, while the cover-image component is used to display images.

1. Implement flip

First, we need to add a cover-view component to the page, and set its position style attribute to absolute, left and top to 0. This will cover the entire page and cover other components.

<cover-view class="flip" @tap="flip">
  <cover-image mode="aspectFill" class="image" src="/static/image/flip.png"></cover-image>
</cover-view>

.flip {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.5);
}

.image {
  width: 40rpx;
  height: 40rpx;
}

In the above code, we first create a cover-view component and set its style properties to absolute, left and top to 0, and width and height to 100%. This will allow the component to fill the entire page and cover other components. Then, we added a cover-image component to this component to display the flip icon.

Next, we need to implement the flip function in the JS code of the page. Specifically, we can call the uni.createSelectorQuery().select method in the flip function to obtain the boundingClientRect of the video component, and then calculate the center point coordinates of the flip based on the width and height attributes of the element. Then, we can call the uni.createAnimation().rotate3d method to create an animation object and flip each component in the page together.

flip() {
  const selector = uni.createSelectorQuery().select('#camera');
  selector.boundingClientRect().exec(res => {
    const { width, height } = res[0];
    const x = width / 2;
    const y = height / 2;

    const animation = uni.createAnimation({
      duration: 1000,
      timingFunction: 'ease-out'
    });

    animation.rotate3d(1, 0, 0, 180).step();

    this.animationData = animation.export();
    this.showBack = !this.showBack;
  })
}

In the above code, we first call the uni.createSelectorQuery().select method to obtain the boundingClientRect of the video component. Next, we calculate the coordinates x and y of the center point of the flip based on the width and height attributes of the element. Then, we created an animation object and called the animation.rotate3d() method to create a three-dimensional flip animation. After the animation ends, we invert the value of the showBack attribute to display the flipped page.

In short, Uniapp's live streaming component is very powerful. We can use the camera-context object to switch camera lenses, and use the cover-view and cover-image components to implement the flip function. These features allow us to develop feature-rich live broadcast applications that bring more fun to users.

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