fix(picker): 修复第一次modalValue值为空，打开面板后直接点击确认按钮，beforeConfirm回调中value参数为空串的问题

[NeverGiveUp1995]

🤔 这个 PR 的性质是？(至少选择一个)

• 日常 bug 修复
• 新特性提交
• 站点、文档改进
• 演示代码改进
• 组件样式/交互改进
• TypeScript 定义更新
• CI/CD 改进
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 代码重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他改动（是关于什么的改动？）

🔗 相关 Issue

💡 需求背景和解决方案

示例代码

<script setup lang="ts">
import { ref } from 'vue'

const animalList = ref([
  { label: '狗', value: 'dog' },
  { label: '猫', value: 'cat' },
  { label: '鸟', value: 'bird' },
])
const selectedAnimal = ref()

const beforeConfirm = (value, resolve) => {
  // 这里取不到值
  console.log('beforeConfirm', value)
  resolve(true)
}

const confirm = ({ value, selectedItem }) => {
  // 这里能取到值
  console.log('confirm', value, selectedItem)
}
</script>

<template>
  <view class="root-container">
    <wd-picker
        :before-confirm="beforeConfirm"
        v-model="selectedAnimal"
        :columns="animalList"
        @confirm="confirm"
    />
  </view>
</template>

<style scoped>
.root-container {
  padding: 5rem 2.5rem;
  text-align: center;
}
</style>

演示效果

534490691-d6d8e270-e7b0-46de-9c8a-4cf54bef80c2.mp4

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充

Summary by CodeRabbit

发布说明

• Bug 修复
  • 改进了选择器确认流程，确保在用户未滑动选择器时能正确获取当前选择的值，提升了用户交互的准确性。

_{✏️ Tip: You can customize this high-level summary in your review settings.}

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[coderabbitai]

概览

wd-picker.vue 中的 onConfirm 流程现在在调用 beforeConfirm 之前从 pickerView 检索当前值，而不是使用之前存储的 pickerValue，以确保当初始 modelValue 未定义且用户确认时不滑动选择器时使用最新的选择器视图状态。

变更

内聚群组 / 文件	摘要
Picker 确认流程修复 src/uni_modules/wot-design-uni/components/wd-picker/wd-picker.vue	修改 onConfirm 流程以在调用 beforeConfirm 前从 pickerView 获取当前值，确保当未设置初始 modelValue 且用户未滑动选择器直接确认时使用最新的选择器状态。

预估代码审查工作量

🎯 2 (简单) | ⏱️ ~10 分钟

可能相关的 PR

• PR #518: 两个 PR 都修改了 wd-picker 和 wd-picker-view 之间选择值的获取和处理方式（确保使用当前选择器视图值以及修复动态列选择），因此相关联。

建议审查人员

• Moonofweisheng

诗歌

🐰 选择器悄悄更新妙，

确认前先看当前值，

未曾滑动也不怕，

最新状态已在手，

轻轻一点，完美呈现！✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确描述了PR的主要改动：修复了当初始modalValue为空时，直接点击确认按钮导致beforeConfirm回调中value参数为空串的问题，与changeset中的实际代码改动完全对应。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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