uniapp 使用 uni.createAnimation 旋转动画模拟抽奖

效果图如下：

 用到的图片如下：

　　　　　　wheel.png 　　　　　　　　　　point.png

api文档：https://uniapp.dcloud.net.cn/api/ui/animation.html#createanimation

 代码如下：

<template>
    <view>
        <view class="box">
            <image src="/static/wheel.png" :animation="animationData"></image>
            <image src="/static/point.png" @click="run"></image>
        </view>
        <view >index：{{result}} -- {{todoList[result]}}</view>
    </view>
</template>

<script>
    export default {
        data() {
            return {
                animationData: {},
                lastResult: 0,
                result: 0,
                deg: 0,
                todoList: ["跑步", "游泳", "学习", "读书", "工作", "休息"],
            }
        },
        methods: {
            run() {
                let animation = uni.createAnimation({
                    transformOrigin: "50% 50%",
                    duration: 2000,
                    timingFunction: "ease",
                    delay: 0
                });
                this.animationData = animation;
                this.animationData.rotate(this.randomNum()).step();
                this.animationData = this.animationData.export();
            },
            randomNum() {
                this.result = Math.floor(Math.random() * 6); //数组索引：[0,5]
                if (this.result > this.lastResult) {
                    this.deg += 360 * 3 + (this.result - this.lastResult) * 60;
                } else {
                    this.deg += 360 * 3 + 360 - (this.lastResult - this.result) * 60;
                }
                console.log(`result:${this.result},deg:${this.deg}`);
                this.lastResult = this.result;

                return this.deg;
            },
        }
    }
</script>

<style>
    .box {
        width: 300rpx;
        height: 300rpx;
        margin: auto;
        position: relative;
    }

    image {
        position: absolute;
        width: 300rpx;
        height: 300rpx;
    }
</style>