How to solve the problem of black dots popping up after uniapp jumps

In recent years, with the rapid development of mobile Internet technology, cross-platform development has become a hot topic in the industry. Among them, uniapp, as a cross-platform development framework, is favored by developers. However, when using uniapp to develop applications, some developers will encounter a problem: black dots appear after jumping to the page. This problem has brought some troubles to developers. This article will discuss the causes and solutions to this problem from the following aspects:

1. The reasons for the appearance of black dots

For this The problem, the official explanation given by uniapp is: On some models, when the page jumps, the black screen flickering caused by the switching of the main process and the sub-process will be detected by the mobile device operating system and displayed as a black dot. form to remind users. Therefore, this situation is caused by the characteristics of the mobile device operating system and has nothing to do with the uniapp development framework itself.

2. Solution

For the above reasons, we can adopt different solutions according to different situations:

1. Enable page transition animation

When jumping to a page, enabling page transition animation can alleviate the black screen flickering caused by page switching, thus reducing the appearance of black dots. For the uniapp framework, the official provides a wealth of transition animations to choose from, which can be set according to your own needs. When writing code, you can use the following method to enable page transition animation:

<template>
  <view>
    <button @click="navigateToPage">跳转页面</button>
  </view>
</template>

<script>
export default {
  methods: {
    navigateToPage() {
      uni.navigateTo({
        url: '/pages/secondPage/secondPage',
        animationType: 'pop-in',
        animationDuration: 200
      })
    }
  }
}
</script>

In the above code, we use the navigateTo function provided by uniapp to jump to the page and set There are two parameters animationType and animationDuration. Among them, the animationType parameter specifies the page transition animation type, and the animationDuration parameter specifies the duration of the animation.

2. Reduce the rendering pressure of the page

In uniapp development, excessive page rendering pressure is also one of the reasons for the appearance of black dots. Therefore, when writing code, try to reduce the rendering pressure of the page and avoid black screen flickering when switching pages. Specifically, we can optimize from the following aspects:

(1) Avoid loading and rendering of a large number of images. In development, image resources are often one of the sources of page rendering pressure. Therefore, you can use lazy loading of images, compression of images, etc. to reduce rendering pressure.

(2) Reasonable use of animation effects. Although animation effects are very helpful in improving user experience, excessive and overly complex animation effects can also cause excessive pressure on page rendering.

(3) Reasonable use of components. The use of components is an important part of uniapp development, but too many and overly complex components may cause excessive page rendering pressure. Therefore, try to reduce the usage of components and avoid unnecessary rendering.

3. Use native components

In some cases, the performance of native components is better than that of uniapp components. Therefore, we can try to use native components to reduce page rendering pressure. When using native components, you can use the $refs provided by uniapp to manipulate DOM elements. Specifically, we can use the following code to create a native component:

<template>
  <view>
    <button @click="navigateToPage">跳转页面</button>
    <my-native-component ref="myNativeComponent"></my-native-component>
  </view>
</template>

<script>
export default {
  mounted() {
    // 获取原生组件
    const myNativeComponent = this.$refs.myNativeComponent.$el
    // 操作原生组件
    myNativeComponent.doSomething()
  }
}
</script>

In the above code, we use <my-native-component> to create a native component and then use $refsTo manipulate DOM elements. This method allows us to use native components directly without creating them through uniapp components.

Summary

In order to solve the problem of black dots appearing after uniapp jumps to the page, we can adopt the following solutions:

1. Enable page transition animation To alleviate the black screen flickering caused when switching pages, thereby reducing the appearance of black dots.
2. Reduce the rendering pressure of the page and avoid black screen flickering when switching pages.
3. In some cases, use native components to reduce page rendering pressure.

To sum up, for this problem, we can avoid black dots and improve user experience through a series of optimization measures.

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