如图：

 

 

html：

<view class="row-item">

<view class="lable-tit">性别：</view>

<view class="selected-all">

<view class="drop-down-box" @click="btnShowHideClick">

<text class="dropdown-content">{{choiceContent}}</text>

<image class="dropdown-icon" src="/static/down.png" mode="widthFix"></image>

</view> 

<view class="dialog-view" v-if="isShowChoice">

<text :class="choiceIndex ==index ?'dialog-title-selected':'dialog-title'"

v-for="(item ,index) in choiceList"

@click="btnChoiceClick(index,item.choiceItemContent)">{{item.choiceItemContent}}</text>

</view>  

</view>

</view>

css

/* 下拉选择框 start*/

.dialog-title-selected {

color: white;

font-size: 16upx;

text-align: center;

background-color: #ea433a;

line-height: 25upx;

}

.dialog-title {

color: #A6A6A6;

font-size: 16upx;

background-color: white;

text-align: center;

line-height: 25upx;

}

.dialog-view {

display: flex;

flex-direction: column;

justify-content: center;

width: 100%;

border: 1upx solid #CACACA;

box-sizing: border-box;

position: absolute;

top: 45px;

left: 0;

z-index: 999;

}

.dropdown-icon {

width: 25rpx;

height: 25rpx;

margin: auto 0;

}

.dropdown-content {

color: #A6A6A6;

font-size: 16upx;

margin-left: 10upx;

}

.drop-down-box {

display: flex;

justify-content: space-between;

align-items: center;

line-height: 35upx;

height: 35upx;

width: 100%;

border: 1upx solid #CACACA;

border-radius: 5upx;

box-sizing: border-box;

padding-right: 10upx;

}

.selected-all {

display: flex;

flex-direction: column;

justify-content: center;

width: 60%;

height: 45px;

position: relative;

}

data:

choiceList: [{

choiceItemId: "0",

choiceItemContent: "请选择"

}, {

choiceItemId: "1",

choiceItemContent: "男"

}, {

choiceItemId: "2",

choiceItemContent: "女"

}],

choiceContent: "请选择", //选择的内容

choiceIndex: 0, //选择位置

isShowChoice: false,

methods:

btnChoiceClick: function(position) {

var _this = this

_this.choiceIndex = position

_this.isShowChoice = false

_this.choiceContent = _this.choiceList[position].choiceItemContent

},

// 显示与隐藏选择内容

btnShowHideClick: function() {

var _this = this

_this.choiceContent = "";

if (_this.isShowChoice) {

_this.isShowChoice = false

} else {

_this.isShowChoice = true

}

},