feat(海报打卡): 添加页面状态管理及空状态处理

添加页面状态管理逻辑，包括正常状态、无打卡信息状态和无活动信息状态
为空状态添加UI展示和处理逻辑
优化组件显示条件，根据状态动态渲染

@@ -15,6 +15,7 @@ declare module 'vue' {
     NutActionSheet: typeof import('@nutui/nutui-taro')['ActionSheet']
     NutButton: typeof import('@nutui/nutui-taro')['Button']
     NutDatePicker: typeof import('@nutui/nutui-taro')['DatePicker']
+    NutDialog: typeof import('@nutui/nutui-taro')['Dialog']
     NutImagePreview: typeof import('@nutui/nutui-taro')['ImagePreview']
     NutInput: typeof import('@nutui/nutui-taro')['Input']
     NutPicker: typeof import('@nutui/nutui-taro')['Picker']

 <template>
   <view class="poster-checkin-page bg-gray-50 h-screen flex flex-col">
     <!-- 活动信息区域 -->
-    <view class="bg-white mx-4 mt-4 mb-2 rounded-lg shadow-sm p-4">
+    <view v-if="pageState === 'normal' || pageState === 'no-checkin'" class="bg-white mx-4 mt-4 mb-2 rounded-lg shadow-sm p-4">
       <!-- 活动主题 -->
       <view class="text-lg font-bold text-gray-800 mb-2">
         {{ activityInfo.title }}
@@ -27,8 +27,8 @@
       </view>
     </view>
 
-    <!-- 海报预览区域 -->
-    <view class="flex-1 mx-4 mb-2 bg-white rounded-lg shadow-sm relative" style="overflow: visible;">
+    <!-- 海报预览区域 - 正常状态 -->
+    <view v-if="pageState === 'normal'" class="flex-1 mx-4 mb-2 bg-white rounded-lg shadow-sm relative" style="overflow: visible;">
       <view class="h-full relative bg-gray-100 flex items-center justify-center">
         <view v-if="currentPoster.path" class="w-full h-full relative">
           <image
@@ -68,8 +68,18 @@
       </view>
     </view>
 
-    <!-- 底部操作按钮 -->
-    <view class="bg-white border-t border-gray-200 p-4 safe-area-bottom">
+    <!-- 没有打卡信息的空状态 -->
+    <view v-if="pageState === 'no-checkin'" class="flex-1 mx-4 mb-2 flex justify-center">
+      <view class="bg-white rounded-lg shadow-sm p-8 text-center max-w-sm">
+        <view class="text-6xl mb-4">📸</view>
+        <view class="text-lg font-bold text-gray-800 mb-2">打卡信息为空</view>
+        <view class="text-sm text-gray-500 mb-4">您还没有打卡记录，请先参加活动打卡后再来生成海报</view>
+        <view class="text-xs text-orange-500">完成打卡后即可生成专属海报</view>
+      </view>
+    </view>
+
+    <!-- 底部操作按钮 - 仅在正常状态显示 -->
+    <view v-if="pageState === 'normal'" class="bg-white border-t border-gray-200 p-4 safe-area-bottom">
       <view class="flex gap-4">
         <view
           class="flex-1 bg-gradient-to-r from-orange-400 to-orange-500 text-white py-3 px-6 rounded-lg font-medium shadow-lg active:scale-95 transition-transform duration-150 flex items-center justify-center gap-2"
@@ -88,9 +98,9 @@
       </view>
     </view>
 
-    <!-- 海报生成组件 -->
+    <!-- 海报生成组件 - 仅在正常状态显示 -->
     <PosterBuilder
-      v-if="shouldGeneratePoster"
+      v-if="shouldGeneratePoster && pageState === 'normal'"
       :config="posterConfig"
       :show-loading="true"
       @success="onPosterSuccess"
@@ -104,6 +114,8 @@
       :init-no="0"
       @close="closePreview"
     />
+
+
   </view>
 </template>
 
@@ -149,7 +161,7 @@ const pageParams = ref({
 const previewVisible = ref(false)
 const previewImages = ref([])
 
-// 活动信息数据
+// 活动信息数据 - 模拟不同状态，实际使用时从API获取
 const activityInfo = ref({
   title: '南京路乐龄时尚消费主题路线',
   checkPoints: [
@@ -164,7 +176,9 @@ const activityInfo = ref({
   endDate: '2025年9月7日'
 })
 
-// 海报列表数据
+// activityInfo.value = {};
+
+// 海报列表数据 - 模拟不同状态，实际使用时从API获取
 const posterList = ref([
   {
     id: 1,
@@ -189,6 +203,30 @@ const posterList = ref([
   }
 ])
 
+// posterList.value = []
+
+// 数据状态检查
+const hasActivityInfo = computed(() => {
+  return activityInfo.value && activityInfo.value.title && activityInfo.value.checkPoints && activityInfo.value.checkPoints.length > 0
+})
+
+const hasCheckinInfo = computed(() => {
+  return posterList.value && posterList.value.length > 0
+})
+
+// 页面显示状态
+const pageState = computed(() => {
+  if (!hasActivityInfo.value) {
+    return 'no-activity' // 没有活动信息
+  }
+  if (!hasCheckinInfo.value) {
+    return 'no-checkin' // 有活动信息但没有打卡信息
+  }
+  return 'normal' // 正常状态
+})
+
+
+
 // 当前海报
 const currentPoster = computed(() => {
   return posterList.value[currentPosterIndex.value] || { path: '', title: '' }
@@ -572,6 +610,43 @@ const savePoster = () => {
     }
   })
 }
+
+/**
+ * 显示没有活动信息的确认对话框
+ */
+const showNoActivityConfirm = () => {
+  Taro.showModal({
+    title: '温馨提示',
+    content: '您还没有参加过活动，请先参加活动后再来生成海报',
+    showCancel: false,
+    confirmText: '知道了',
+    success: (res) => {
+      if (res.confirm) {
+        // 返回上一页
+        Taro.navigateBack({
+          delta: 1
+        })
+      }
+    }
+  })
+}
+
+/**
+ * 页面初始化
+ */
+onMounted(() => {
+  // 获取页面参数
+  const instance = Taro.getCurrentInstance()
+  if (instance.router && instance.router.params) {
+    pageParams.value = instance.router.params
+  }
+
+  // 检查页面状态
+  if (pageState.value === 'no-activity') {
+    // 没有活动信息，显示确认对话框
+    showNoActivityConfirm()
+  }
+})
 </script>
 
 <style lang="less">