| New file | 
 |  |  | 
 |  |  | <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> |