UniApp's design and development method for implementing custom animation and special effects

UniApp is a cross-platform application framework developed based on Vue.js, designed to help developers quickly build applications with animation and special effects. This article will introduce how to implement the design and development of custom animations and special effects in UniApp, and provide relevant code examples.

1. Design and development preparation
To achieve custom animation and special effects, we need to use the following components and tools in the UniApp project:

1. Officially provided by uni-app animation component. uni-app provides some built-in animation components, such as animation, transition, swiper, etc., which can quickly achieve basic animation effects.
2. CSS3 animation and transition effects. In addition to using the built-in animation components, we can also use CSS3 animation and transition effects to achieve more flexible and diverse animation effects.
3. Third-party plug-in library. In order to achieve some more complex and specific animation effects, we can introduce some third-party plug-in libraries, such as Animate.css, Tween.js, etc.

2. Achieve animation effects

1. Use built-in animation components
   UniApp officially provides some built-in animation components, we can directly use these components to achieve some basic animation effect. For example, by using the uni-swiper component and animation component, we can achieve an animation effect of a picture carousel:

<template>
  <view>
    <swiper>
    <swiper-item v-for="(item, index) in list" :key="index">
      <animation show="{{item.show}}" delay="{{index*500}}">
        <image :src="item.src"></image>
      </animation>
    </swiper-item>
    </swiper>
  </view>
</template>

<script>
export default {
  data() {
    return {
      list: [
        { src: 'img1.png', show: false },
        { src: 'img2.png', show: false },
        { src: 'img3.png', show: false }
      ]
    }
  },
  mounted() {
    this.showAnimation()
  },
  methods: {
    showAnimation() {
      setTimeout(() => {
        this.list.forEach((item, index) => {
          item.show = !item.show
        })
      }, 1000)
    }
  }
}
</script>

In the above example, the display of the picture is controlled by setting the show attribute of the animation component With hiding, use the delay attribute to set the delay time of the animation to achieve the effect of image carousel.

2. Using CSS3 animation and transition effects
   CSS3 provides a wealth of animation and transition effects, and we can use them to achieve some more flexible and diverse animation effects. For example, we can use the @keyframes rule to define a custom animation and apply it to elements that require animation effects:

<style>
@keyframes rotate {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.rotate-box {
  animation: rotate 2s infinite linear;
}
</style>

<template>
  <view class="rotate-box">
    <image src="img.png"></image>
  </view>
</template>

In the above example, we use the @keyframes rule to define a The animation named rotate achieves the rotation effect of the element by setting the transform attribute. Then, apply this animation on the element that needs animation effect, and set the name, duration, number of repetitions and timing function of the animation through the animation attribute, thereby realizing an infinite loop of element rotation animation.

3. Use third-party plug-in libraries
   In addition to using built-in animation components and CSS3 animation effects, we can also introduce some third-party plug-in libraries to achieve some more complex and specific animation effects. For example, we can use the Animate.css plug-in library to achieve some cool animation effects:

<template>
  <view>
    <view class="animated fadeIn">Fade in</view>
    <view class="animated bounce">Bounce</view>
    <view class="animated zoomIn">Zoom in</view>
  </view>
</template>

<style>
@import 'animate.css';

.view {
  width: 200px;
  height: 200px;
  background-color: #ccc;
  margin: 20px;
  text-align: center;
  line-height: 200px;
}
</style>

In the above example, we introduced the Animate.css plug-in library and applied it to the application that requires animation on the elements of the effect. By adding animated classes and corresponding animation class names to elements, such as fadeIn, bounce, zoomIn, etc., you can achieve different animation effects.

Summary
This article introduces the design and development method of implementing custom animation and special effects in UniApp, and gives relevant code examples, including using built-in animation components, using CSS3 animation and transition effects And introduce third-party plug-in libraries to achieve animation effects. By rationally using these methods, developers can easily implement a variety of cool animations and special effects to improve the user experience of the application.

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