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picker-view 是 UniApp 中用于展示和选择数据的组件。它适用于创建多列选择器，类似于 iOS 和 Android 系统中的选择器视图。以下是 picker-view 的详细介绍，包括用法、属性和事件。

一 用法

<template><view><picker-view :value="value" @change="onChange" :indicator-style="indicatorStyle"><picker-view-column v-for="(column, index) in columns" :key="index"><view v-for="(item, itemIndex) in column" :key="itemIndex">{{ item }}</view></picker-view-column></picker-view></view>
</template>

<script>
export default {data() {return {value: [0, 0], // 选中的值对应列中的索引columns: [     // 列数据['Option 1', 'Option 2', 'Option 3'],['Item 1', 'Item 2', 'Item 3']],indicatorStyle: 'height: 50px; line-height: 50px;' // 指示器样式};},methods: {onChange(e) {this.value = e.detail.value; // 更新选中的值console.log('Selected value:', this.value);}}
};
</script>

<style scoped>
/* 可以根据需要添加自定义样式 */
</style>

二 主要属性

• value: 数组，表示当前选中的索引值。数组的长度应与 columns 的列数一致。例如，如果有两列，每列的选项数组长度分别为 3 和
  3，则 value 应该是 [0, 0] 表示两列的默认选中项索引。
• indicator-style: 字符串，用于设置选择器的指示器样式。可以设置如高度、背景颜色等样式。

三 主要事件

change: 当用户选择了新项时触发。事件对象的 detail.value 是更新后的选中值数组。例如：

onChange(e) {this.value = e.detail.value;console.log('Selected value:', this.value);
}

• picker-view-column 是 picker-view 的子组件，每个 picker-view-column 代表一个列。
• v-for 指令用于遍历 columns 和列中的选项数据。
• e.detail.value 是一个数组，表示用户选择的每一列的索引。

四 应用场景

• 选择日期和时间
• 选择地区（省市区）
• 多级分类选择

五 案例

需求 ：购买商品时，可以选择取货时间，点击向右的箭头可以显示选择预约取货时间弹窗。第一次进入弹窗，默认回显当前时间，选择时间后，回显选择的时间
父组件在打开弹框时，会传一个当前时间给子组件，子组件在初始化时，根据当前时间进行回显。

根据传过来的时间，拿到月，时，分，然后分别在days,hours,minutes中找到对应的index,在分别把index push到value中

  let dayIndex = this.days.findIndex((item) => item === objTimeDay);let hourIndex = this.hours.findIndex((item) => item === objTimeHour);let minuteIndex = this.minutes.findIndex((item) => item === objTimeMinute);if (dayIndex > -1) {this.value[0] = dayIndex;}if (hourIndex > -1) {this.value[1] = hourIndex;}if (minuteIndex > -1) {this.value[2] = minuteIndex;}

完整代码
父组件

// 引用
import selectTime from './selectTime/index.vue';
//注册components: { selectAddress, selectShop, selectTime },
//使用<select-time ref="selectTime" @getSelectTime="getSelectTime"></select-time>openSelectTimePopup() {this.$refs.selectTime.open(this.selectTimeInfo);},// 自定义事件
getSelectTime(obj) {this.selectTimeInfo = obj;
},

selectTime 弹窗

<template><uni-popup ref="selectTime" type="bottom" :maskClick="true"><view class="main"><view class="main-header"><view class="main-header-title">预约取货时间</view><view class="main-header-image" @click="close"><image src="@/static/image/cart/sureOrder/close.png"></image></view></view><view class="main-time"><picker-view v-if="visible" :indicator-style="indicatorStyle" :value="value" @change="bindChange" class="picker-view"><picker-view-column><view class="item" v-for="(item, index) in days" :key="index">{{ item }}</view></picker-view-column><picker-view-column><view class="item" v-for="(item, index) in hours" :key="index">{{ item }}</view></picker-view-column><picker-view-column><view class="item" v-for="(item, index) in minutes" :key="index">{{ item }}</view></picker-view-column></picker-view></view><view class="main-button" @click="confirm">确认</view></view></uni-popup>
</template><script>
export default {data() {return {days: [],hours: [],minutes: [],day: '',hour: '',minute: '',visible: true,value: [],indicatorStyle: `height: 50px;`,selectTimeInfo: {name: '',time: ''}};},methods: {confirm() {this.day = this.days[this.value[0]];this.hour = this.hours[this.value[1]];this.minute = this.minutes[this.value[2]];this.selectTimeInfo.name = this.day + ' ' + this.hour + ':' + this.minute;let currentDate = new Date();currentDate.setDate(currentDate.getDate() + this.value[0]);let selectYear = currentDate.getFullYear();let selectTimeMonth = currentDate.getMonth() + 1 < 10 ? '0' + (currentDate.getMonth() + 1) : currentDate.getMonth() + 1;let selectTimeDay = currentDate.getDate() < 10 ? '0' + currentDate.getDate() : currentDate.getDate();let time = selectYear + '-' + selectTimeMonth + '-' + selectTimeDay + ' ' + this.hour + ':' + this.minute;this.selectTimeInfo.time = time.slice(0, 16)+':' + '00';this.$emit('getSelectTime', this.selectTimeInfo);this.close();},init(obj) {// dayfor (var i = 0; i < 5; i++) {let date = new Date();let day;if (i === 0) {day = '今天';} else if (i === 1) {day = '明天';} else {date.setDate(date.getDate() + i);let month = date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1;let d = date.getDate() < 10 ? '0' + date.getDate() : date.getDate();day = month + '月' + d + '日';}this.days.push(day);}let currentDate = new Date();let currentMonth = currentDate.getMonth() + 1;let currentDay = currentDate.getDate();let selectTime = obj.time;let objTimeDate = new Date(selectTime);let selectMonth = objTimeDate.getMonth() + 1;let selectDay = objTimeDate.getDate();let objTimeDay;if (currentMonth === selectMonth && currentDay === selectDay) {objTimeDay = '今天';} else if (currentMonth === selectMonth && currentDay + 1 === selectDay) {objTimeDay = '明天';} else {let month = selectMonth < 10 ? '0' + selectMonth + '月' : selectMonth + '月';let day = selectDay < 10 ? '0' + selectDay + '日' : selectDay + '日';objTimeDay = month + day;}let objTimeHour = objTimeDate.getHours() < 10 ? '0' + objTimeDate.getHours() : objTimeDate.getHours();let objTimeMinute = objTimeDate.getMinutes() < 10 ? '0' + objTimeDate.getMinutes() + '分' : objTimeDate.getMinutes() + '分';this.hours = this.getHoursRange(0, 24);this.minutes = this.getMinuteRange(0, 61);let dayIndex = this.days.findIndex((item) => item === objTimeDay);let hourIndex = this.hours.findIndex((item) => item === objTimeHour);let minuteIndex = this.minutes.findIndex((item) => item === objTimeMinute);if (dayIndex > -1) {this.value[0] = dayIndex;}if (hourIndex > -1) {this.value[1] = hourIndex;}if (minuteIndex > -1) {this.value[2] = minuteIndex;}},getHoursRange(startHour, endHour) {const hours = [];for (let i = startHour; i <= endHour; i++) {let hour = i < 10 ? '0' + i : i;hours.push(hour);}return hours;},getMinuteRange(startMinute, endMinute) {let minutes = [];for (var i = startMinute; i < endMinute; i++) {let minute = i < 10 ? '0' + i + '分' : i + '分';minutes.push(minute);}return minutes;},bindChange(e) {const val = e.detail.value;this.value[0] = val[0];this.value[1] = val[1];this.value[2] = val[2];},open(obj) {this.$refs.selectTime.open();this.init(obj);},close() {this.$refs.selectTime.close();}}
};
</script><style lang="scss" scoped>
.main {width: 100%;height: 732rpx;border-radius: 32rpx 32rpx 0px 0px;background-color: #fff;box-sizing: border-box;.main-header {padding: 40rpx 0 0 40rpx;display: flex;align-items: center;justify-content: space-between;.main-header-title {font-family: Source Han Sans CN, Source Han Sans CN;font-weight: bold;font-size: 36rpx;color: #333333;text-align: left;font-style: normal;text-transform: none;}.main-header-image {width: 48rpx;height: 48rpx;margin-right: 40rpx;image {width: 100%;height: 100%;}}}.main-time {width: 100%;height: 400rpx;margin-top: 80rpx;.picker-view {width: 100%;height: 300rpx;margin-top: 20rpx;}.item {line-height: 100rpx;text-align: center;}}.main-button {width: 496rpx;height: 80rpx;background: #c11920;border-radius: 80rpx;font-family: Source Han Sans CN, Source Han Sans CN;font-weight: 400;font-size: 32rpx;color: #ffffff;line-height: 80rpx;text-align: center;font-style: normal;text-transform: none;margin: 40rpx auto 0 auto;}
}
</style>

如果需要设置不能选择之前的时间，可以拿到当前时间的时，分，来设置

 if (objTimeDay === '今天') {this.hours = this.getHoursRange(currentHour, 24);this.minutes = this.getMinuteRange(currentMinute, 61);} else {this.hours = this.getHoursRange(0, 24);this.minutes = this.getMinuteRange(0, 61);}getHoursRange(startHour, endHour) {const hours = [];for (let i = startHour; i <= endHour; i++) {let hour = i < 10 ? '0' + i : i;hours.push(hour);}return hours;},getMinuteRange(startMinute, endMinute) {let minutes = [];for (var i = startMinute; i < endMinute; i++) {let minute = i < 10 ? '0' + i + '分' : i + '分';minutes.push(minute);}return minutes;},