| <template> | 
|     <view | 
|         class="u-switch" | 
|         :class="[disabled && 'u-switch--disabled']" | 
|         :style="[switchStyle, $u.addStyle(customStyle)]" | 
|         @tap="clickHandler" | 
|     > | 
|         <view | 
|             class="u-switch__bg" | 
|             :style="[bgStyle]" | 
|         > | 
|         </view> | 
|         <view | 
|             class="u-switch__node" | 
|             :class="[value && 'u-switch__node--on']" | 
|             :style="[nodeStyle]" | 
|             ref="u-switch__node" | 
|         > | 
|             <u-loading-icon | 
|                 :show="loading" | 
|                 mode="circle" | 
|                 timingFunction='linear' | 
|                 :color="value ? activeColor : '#AAABAD'" | 
|                 :size="size * 0.6" | 
|             /> | 
|         </view> | 
|     </view> | 
| </template> | 
|   | 
| <script> | 
|     import props from './props.js'; | 
|     /** | 
|      * switch 开关选择器 | 
|      * @description 选择开关一般用于只有两个选择,且只能选其一的场景。 | 
|      * @tutorial https://www.uviewui.com/components/switch.html | 
|      * @property {Boolean}                        loading            是否处于加载中(默认 false ) | 
|      * @property {Boolean}                        disabled        是否禁用(默认 false ) | 
|      * @property {String | Number}                size            开关尺寸,单位px (默认 25 ) | 
|      * @property {String}                        activeColor        打开时的背景色 (默认 '#2979ff' ) | 
|      * @property {String}                         inactiveColor    关闭时的背景色 (默认 '#ffffff' ) | 
|      * @property {Boolean | String | Number}    value            通过v-model双向绑定的值 (默认 false ) | 
|      * @property {Boolean | String | Number}    activeValue        打开选择器时通过change事件发出的值 (默认 true ) | 
|      * @property {Boolean | String | Number}    inactiveValue    关闭选择器时通过change事件发出的值 (默认 false ) | 
|      * @property {Boolean}                        asyncChange        是否开启异步变更,开启后需要手动控制输入值 (默认 false ) | 
|      * @property {String | Number}                space            圆点与外边框的距离 (默认 0 ) | 
|      * @property {Object}                        customStyle        定义需要用到的外部样式 | 
|      * | 
|      * @event {Function} change 在switch打开或关闭时触发 | 
|      * @example <u-switch v-model="checked" active-color="red" inactive-color="#eee"></u-switch> | 
|      */ | 
|     export default { | 
|         name: "u-switch", | 
|         mixins: [uni.$u.mpMixin, uni.$u.mixin,props], | 
|         watch: { | 
|             value: { | 
|                 immediate: true, | 
|                 handler(n) { | 
|                     if(n !== this.inactiveValue && n !== this.activeValue) { | 
|                         uni.$u.error('v-model绑定的值必须为inactiveValue、activeValue二者之一') | 
|                     } | 
|                 } | 
|             } | 
|         }, | 
|         data() { | 
|             return { | 
|                 bgColor: '#ffffff' | 
|             } | 
|         }, | 
|         computed: { | 
|             isActive(){ | 
|                 return this.value === this.activeValue; | 
|             }, | 
|             switchStyle() { | 
|                 let style = {} | 
|                 // 这里需要加2,是为了腾出边框的距离,否则圆点node会和外边框紧贴在一起 | 
|                 style.width = uni.$u.addUnit(this.size * 2 + 2) | 
|                 style.height = uni.$u.addUnit(Number(this.size) + 2) | 
|                 // style.borderColor = this.value ? 'rgba(0, 0, 0, 0)' : 'rgba(0, 0, 0, 0.12)' | 
|                 // 如果自定义了“非激活”演示,name边框颜色设置为透明(跟非激活颜色一致) | 
|                 // 这里不能简单的设置为非激活的颜色,否则打开状态时,会有边框,所以需要透明 | 
|                 if(this.customInactiveColor) { | 
|                     style.borderColor = 'rgba(0, 0, 0, 0)' | 
|                 } | 
|                 style.backgroundColor = this.isActive ? this.activeColor : this.inactiveColor | 
|                 return style; | 
|             }, | 
|             nodeStyle() { | 
|                 let style = {} | 
|                 // 如果自定义非激活颜色,将node圆点的尺寸减少两个像素,让其与外边框距离更大一点 | 
|                 style.width = uni.$u.addUnit(this.size - this.space) | 
|                 style.height = uni.$u.addUnit(this.size - this.space) | 
|                 const translateX = this.isActive ? uni.$u.addUnit(this.space) : uni.$u.addUnit(this.size); | 
|                 style.transform = `translateX(-${translateX})` | 
|                 return style | 
|             }, | 
|             bgStyle() { | 
|                 let style = {} | 
|                 // 这里配置一个多余的元素在HTML中,是为了让switch切换时,有更良好的背景色扩充体验(见实际效果) | 
|                 style.width = uni.$u.addUnit(Number(this.size) * 2 - this.size / 2) | 
|                 style.height = uni.$u.addUnit(this.size) | 
|                 style.backgroundColor = this.inactiveColor | 
|                 // 打开时,让此元素收缩,否则反之 | 
|                 style.transform = `scale(${this.isActive ? 0 : 1})` | 
|                 return style | 
|             }, | 
|             customInactiveColor() { | 
|                 // 之所以需要判断是否自定义了“非激活”颜色,是为了让node圆点离外边框更宽一点的距离 | 
|                 return this.inactiveColor !== '#fff' && this.inactiveColor !== '#ffffff' | 
|             } | 
|         }, | 
|         methods: { | 
|             clickHandler() { | 
|                 if (!this.disabled && !this.loading) { | 
|                     const oldValue = this.isActive ? this.inactiveValue : this.activeValue | 
|                     if(!this.asyncChange) { | 
|                         this.$emit('input', oldValue) | 
|                     } | 
|                     // 放到下一个生命周期,因为双向绑定的value修改父组件状态需要时间,且是异步的 | 
|                     this.$nextTick(() => { | 
|                         this.$emit('change', oldValue) | 
|                     }) | 
|                 } | 
|             } | 
|         } | 
|     }; | 
| </script> | 
|   | 
| <style lang="scss" scoped> | 
|     @import "../../libs/css/components.scss"; | 
|   | 
|     .u-switch { | 
|         @include flex(row); | 
|         /* #ifndef APP-NVUE */ | 
|         box-sizing: border-box; | 
|         /* #endif */ | 
|         position: relative; | 
|         background-color: #fff; | 
|         border-width: 1px; | 
|         border-radius: 100px; | 
|         transition: background-color 0.4s; | 
|         border-color: rgba(0, 0, 0, 0.12); | 
|         border-style: solid; | 
|         justify-content: flex-end; | 
|         align-items: center; | 
|         // 由于weex为阿里逗着玩的KPI项目,导致bug奇多,这必须要写这一行, | 
|         // 否则在iOS上,点击页面任意地方,都会触发switch的点击事件 | 
|         overflow: hidden; | 
|   | 
|         &__node { | 
|             @include flex(row); | 
|             align-items: center; | 
|             justify-content: center; | 
|             border-radius: 100px; | 
|             background-color: #fff; | 
|             border-radius: 100px; | 
|             box-shadow: 1px 1px 1px 0 rgba(0, 0, 0, 0.25); | 
|             transition-property: transform; | 
|             transition-duration: 0.4s; | 
|             transition-timing-function: cubic-bezier(0.3, 1.05, 0.4, 1.05); | 
|         } | 
|   | 
|         &__bg { | 
|             position: absolute; | 
|             border-radius: 100px; | 
|             background-color: #FFFFFF; | 
|             transition-property: transform; | 
|             transition-duration: 0.4s; | 
|             border-top-left-radius: 0; | 
|             border-bottom-left-radius: 0; | 
|             transition-timing-function: ease; | 
|         } | 
|   | 
|         &--disabled { | 
|             opacity: 0.6; | 
|         } | 
|     } | 
| </style> |