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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:
showImage
property and set its initial value to false. data() { return { showImage: false }; },
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); },
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:
fade-in
. <template> <div> <div v-if="showImage"> <img class="fade-in" src="path/to/image.jpg" alt="Image" /> </div> </div> </template>
.fade-in
class. .fade-in { opacity: 0; transition: opacity 0.5s; } .fade-in.show { opacity: 1; }
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); },
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