效果图：

wxml:

<view class="item">
    <view class="left">联系地址：</view>
    <picker class="right" mode="region" bindchange="bindRegionChange" value="{{region}}" custom-item="{{customItem}}">
        <input placeholder="请输入您的联系地址！" name="area" placeholder-class="placeholder" value="{{regionVal}}" />
    </picker>
</view>

wxss:

.forms .item {
  border-bottom: 1rpx solid #ddd;
  display: flex;
  justify-content: space-between;
  padding: 18rpx 0;
}
.forms .item .left {
  font-size: 35rpx;
  color: #666;
  width: 180rpx;
}
.forms .item .right {
  flex: 1;
}
.forms .item .right input {
  text-align: right;
  font-size: 30rpx;
}
.forms .item .right .placeholder {
  color: #999;
  font-size: 28rpx;
}

js

data: {
  region: ["广东省", "广州市", "天河区"],
  regionVal: [],
},

// 地址选择
bindRegionChange: function (e) {
  console.log("picker发送选择改变，携带值为", e.detail.value);
  this.setData({
    regionVal: e.detail.value,
  });
},