fix(地区选择): 修复地区选择无效值时默认使用第一个区域

当selectedValue[0]为0或无效时，使用第一个区域作为默认值并确保转换为数字类型

 <!--
  * @Date: 2025-08-27 17:44:53
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-02 21:40:15
+ * @LastEditTime: 2025-09-03 22:01:38
  * @FilePath: /lls_program/src/pages/CreateFamily/index.vue
  * @Description: 文件描述
 -->
@@ -229,8 +229,17 @@ const isFormValid = computed(() => {
  * @param {object} param0 - 包含 selectedValue 和 selectedOptions 的对象
  */
 const onDistrictConfirm = ({ selectedValue, selectedOptions }) => {
-  selectedDistrict.value = selectedValue[0];
-  selectedDistrictText.value = selectedOptions.map((option) => option.text).join('');
+  // 如果selectedValue[0]为0或无效，使用第一个区域作为默认值
+  if (!selectedValue[0] || selectedValue[0] === 0) {
+    const firstDistrict = districtColumns.value[0];
+    selectedDistrict.value = firstDistrict.value;
+    selectedDistrictText.value = firstDistrict.text;
+    districtValue.value = [firstDistrict.value]; // 同步更新picker的值
+  } else {
+    selectedDistrict.value = +selectedValue[0]; // 确保转换为数字类型
+    selectedDistrictText.value = selectedOptions.map((option) => option.text).join('');
+  }
+
   showDistrictPicker.value = false;
 };
 

 <!--
  * @Date: 2025-08-27 17:44:53
  * @LastEditors: hookehuyr hookehuyr@gmail.com
- * @LastEditTime: 2025-09-03 20:31:29
+ * @LastEditTime: 2025-09-03 21:59:36
  * @FilePath: /lls_program/src/pages/EditFamily/index.vue
  * @Description: 文件描述
 -->
@@ -237,8 +237,17 @@ onMounted(async () => {
  * @param {object} param0 - 包含 selectedValue 和 selectedOptions 的对象
  */
 const onDistrictConfirm = ({ selectedValue, selectedOptions }) => {
-  selectedDistrict.value = selectedValue[0];
-  selectedDistrictText.value = selectedOptions.map((option) => option.text).join('');
+  // 如果selectedValue[0]为0或无效，使用第一个区域作为默认值
+  if (!selectedValue[0] || selectedValue[0] === 0) {
+    const firstDistrict = districtColumns.value[0];
+    selectedDistrict.value = firstDistrict.value;
+    selectedDistrictText.value = firstDistrict.text;
+    districtValue.value = [firstDistrict.value]; // 同步更新picker的值
+  } else {
+    selectedDistrict.value = +selectedValue[0]; // 确保转换为数字类型
+    selectedDistrictText.value = selectedOptions.map((option) => option.text).join('');
+  }
+
   showDistrictPicker.value = false;
 };