How Vue solves the flickering problem of gesture-enlarged pictures on mobile terminals

How to solve the flickering problem of mobile-side gesture amplification pictures in Vue development

Mobile-side gesture amplification pictures is a common user interaction method. However, in Vue development, due to the influence of the rendering mechanism, gesture amplification There may be flickering issues when taking pictures. This article will introduce a way to solve this problem.

First of all, we need to understand the cause of this problem. On the mobile side, we usually use the transform: scale() attribute of CSS to achieve the effect of gesture enlargement of images. This can maintain the quality of the image and will not affect the layout. However, in Vue's virtual DOM rendering, when the image changes, Vue will re-render the entire component, which leads to the problem of image flickering.

To solve this problem, we can use Vue's life cycle hook function to control the rendering timing of the image. The specific steps are as follows:

1. In the Vue component, add a data attribute to control whether the image needs to be displayed. For example, we can add a showImage property and set its initial value to false.

data() {
  return {
    showImage: false
  };
},

2. In Vue's mounted hook function, after delaying for a period of time through setTimeout, set the showImage attribute is true. The purpose of this is to display the image after Vue rendering is completed to avoid flickering problems.

mounted() {
  setTimeout(() => {
    this.showImage = true;
  }, 100);
},

3. In the template of the Vue component, use the v-if directive to control the display and hiding of images. The image is only rendered if showImage is true.

<template>
  <div>
    <div v-if="showImage">
      <img src="path/to/image.jpg" alt="Image" />
    </div>
  </div>
</template>

Through the above steps, we have achieved the effect of delaying the display of pictures and solved the problem of flickering of pictures enlarged by gestures on the mobile terminal. The image will not be displayed until the Vue component is rendered, thus avoiding flickering.

In addition to the above methods, you can also use CSS animation effects to control the gradient display of images to further optimize the experience. For example, you can use the opacity attribute and the transition attribute to achieve a gradient display effect. The specific steps are as follows:

1. In the template of the Vue component, add a class name to the picture element, such as fade-in.

<template>
  <div>
    <div v-if="showImage">
      <img class="fade-in" src="path/to/image.jpg" alt="Image" />
    </div>
  </div>
</template>

2. In CSS, add animation effects to the .fade-in class.

.fade-in {
  opacity: 0;
  transition: opacity 0.5s;
}

.fade-in.show {
  opacity: 1;
}

3. In Vue's mounted hook function, after delaying for a period of time through setTimeout, add .show# to the image element ## class, thereby triggering animation effects.

mounted() {
  setTimeout(() => {
    this.showImage = true;
    document.querySelector('.fade-in').classList.add('show');
  }, 100);
},

Through the above method, we achieved the gradient display effect of the picture and reduced the problem of picture flickering.
To sum up, the key to solving the flickering problem of gesture-enlarged images on the mobile terminal is to control the rendering timing of the image. We can use Vue's life cycle hook function and CSS animation effect to delay the display or gradient display of the image, thereby avoiding the phenomenon of image flickering. This can provide a smoother and more elegant user experience, and there is no need to use third-party libraries or plug-ins. You only need to flexibly use existing features in Vue development.

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