一、功能概述與實現步驟

1.1 功能需求

• 顯示地圖并固定中心點標記

• 繪制服務區域多邊形邊界

• 實時檢測拖拽后位置是否在服務區內

• 提供位置確認和超出范圍提示功能

1.2 實現步驟分解

第一步：初始化地圖基礎配置

1. 創建Map組件并設置基本屬性

2. 定義服務區域多邊形坐標

3. 設置地圖初始中心點

第二步：實現地圖交互邏輯

1. 監聽地圖拖拽事件

2. 獲取拖拽后中心點坐標

3. 判斷坐標是否在服務區內

第三步：實現覆蓋層UI

1. 固定中心點標記

2. 位置信息顯示面板

3. 操作按鈕（確認/返回服務區）

   二、分步驟代碼實現

   2.1 第一步：地圖基礎配置

   <template><view class="map-container"><mapid="map"style="width: 100%; height: 80vh":latitude="center.latitude":longitude="center.longitude":polygons="polygons"@regionchange="handleMapDrag":show-location="true"><!-- 覆蓋層將在第三步添加 --></map></view>
   </template><script setup>
   import { ref, onMounted } from "vue";// 服務區域邊界坐標
   const serviceAreaPolygon = [{ latitude: 34.808, longitude: 113.55 },{ latitude: 34.805, longitude: 113.58 },// ...其他坐標點{ latitude: 34.808, longitude: 113.55 } // 閉合多邊形
   ];// 中心點位置
   const center = ref({latitude: 34.747, longitude: 113.625
   });// 多邊形配置
   const polygons = ref([{points: serviceAreaPolygon,strokeWidth: 2,strokeColor: "#1E90FF",fillColor: "#1E90FF22"
   }]);// 初始化地圖上下文
   const mapContext = ref(null);
   onMounted(() => {mapContext.value = uni.createMapContext("map");
   });
   </script>

   2.2 第二步：地圖交互邏輯實現

   // 當前坐標點
   const currentPos = ref({ ...center.value });
   // 是否在服務區內
   const isInServiceArea = ref(true);// 地圖拖拽事件處理
   const handleMapDrag = (e) => {if (e.type === "end") {mapContext.value.getCenterLocation({success: (res) => {currentPos.value = {latitude: res.latitude,longitude: res.longitude};// 判斷是否在服務區內isInServiceArea.value = isPointInPolygon(currentPos.value,serviceAreaPolygon);}});}
   };// 射線法判斷點是否在多邊形內
   function isPointInPolygon(point, polygon) {const { latitude, longitude } = point;let inside = false;for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {const xi = polygon[i].longitude, yi = polygon[i].latitude;const xj = polygon[j].longitude, yj = polygon[j].latitude;const intersect = ((yi > latitude) !== (yj > latitude))&& (longitude < (xj - xi) * (latitude - yi) / (yj - yi) + xi);if (intersect) inside = !inside;}return inside;
   }

   2.3 第三步：覆蓋層UI實現

   <!-- 在map標簽內添加 -->
   <cover-view class="center-marker"></cover-view><cover-view class="info-box" :class="{ 'out-of-range': !isInServiceArea }"><cover-view v-if="isInServiceArea">當前位置在服務區域內</cover-view><cover-view v-else class="error">當前選擇位置超出服務區域</cover-view><cover-view class="coords">緯度: {{ currentPos.latitude.toFixed(6) }} 經度: {{ currentPos.longitude.toFixed(6) }}</cover-view><cover-view v-if="!isInServiceArea" class="recenter-btn" @tap="centerToServiceArea">查看最近的服務區域</cover-view><cover-view v-else class="confirm-btn" @tap="confirmLocation">確定上車位置</cover-view>
   </cover-view>

   2.4 第四步：業務功能完善

   // 返回服務區中心
   const centerToServiceArea = () => {const center = getPolygonCenter(serviceAreaPolygon);currentPos.value = { ...center };isInServiceArea.value = true;mapContext.value.moveToLocation({latitude: center.latitude,longitude: center.longitude});
   };// 計算多邊形中心點
   function getPolygonCenter(polygon) {let latSum = 0, lngSum = 0;polygon.forEach(point => {latSum += point.latitude;lngSum += point.longitude;});return {latitude: latSum / polygon.length,longitude: lngSum / polygon.length};
   }// 確認位置
   const confirmLocation = () => {uni.showToast({title: `位置已確認: ${currentPos.value.latitude.toFixed(6)}, ${currentPos.value.longitude.toFixed(6)}`,icon: "none"});// 實際業務中可以觸發回調或跳轉
   };

   三、完整實現代碼

   <template><view class="map-container"><mapid="map"style="width: 100%; height: 80vh":latitude="center.latitude":longitude="center.longitude":polygons="polygons"@regionchange="handleMapDrag":show-location="true"><cover-view class="center-marker"></cover-view><cover-view class="info-box" :class="{ 'out-of-range': !isInServiceArea }"><cover-view v-if="isInServiceArea">當前位置在服務區域內</cover-view><cover-view v-else class="error">當前選擇位置超出服務區域</cover-view><cover-view class="coords">緯度: {{ currentPos.latitude.toFixed(6) }} 經度: {{ currentPos.longitude.toFixed(6) }}</cover-view><cover-view v-if="!isInServiceArea" class="recenter-btn" @tap="centerToServiceArea">查看最近的服務區域</cover-view><cover-view v-else class="confirm-btn" @tap="confirmLocation">確定上車位置</cover-view></cover-view></map></view>
   </template><script setup>
   import { ref, onMounted } from "vue";// 服務區域邊界
   const serviceAreaPolygon = [{ latitude: 34.808, longitude: 113.55 },{ latitude: 34.805, longitude: 113.58 },{ latitude: 34.79, longitude: 113.61 },{ latitude: 34.765, longitude: 113.625 },{ latitude: 34.735, longitude: 113.62 },{ latitude: 34.71, longitude: 113.6 },{ latitude: 34.7, longitude: 113.57 },{ latitude: 34.715, longitude: 113.54 },{ latitude: 34.75, longitude: 113.53 },{ latitude: 34.808, longitude: 113.55 }
   ];const center = ref(getPolygonCenter(serviceAreaPolygon));
   const currentPos = ref({ ...center.value });
   const isInServiceArea = ref(true);
   const mapContext = ref(null);const polygons = ref([{points: serviceAreaPolygon,strokeWidth: 2,strokeColor: "#1E90FF",fillColor: "#1E90FF22"
   }]);onMounted(() => {mapContext.value = uni.createMapContext("map");
   });const handleMapDrag = (e) => {if (e.type === "end") {mapContext.value.getCenterLocation({success: (res) => {currentPos.value = {latitude: res.latitude,longitude: res.longitude};isInServiceArea.value = isPointInPolygon(currentPos.value,serviceAreaPolygon);}});}
   };function isPointInPolygon(point, polygon) {const { latitude, longitude } = point;let inside = false;for (let i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {const xi = polygon[i].longitude, yi = polygon[i].latitude;const xj = polygon[j].longitude, yj = polygon[j].latitude;const intersect = ((yi > latitude) !== (yj > latitude))&& (longitude < (xj - xi) * (latitude - yi) / (yj - yi) + xi);if (intersect) inside = !inside;}return inside;
   }function getPolygonCenter(polygon) {let latSum = 0, lngSum = 0;polygon.forEach(point => {latSum += point.latitude;lngSum += point.longitude;});return {latitude: latSum / polygon.length,longitude: lngSum / polygon.length};
   }const centerToServiceArea = () => {const center = getPolygonCenter(serviceAreaPolygon);currentPos.value = { ...center };isInServiceArea.value = true;mapContext.value.moveToLocation({latitude: center.latitude,longitude: center.longitude});
   };const confirmLocation = () => {uni.showToast({title: `位置已確認: ${currentPos.value.latitude.toFixed(6)}, ${currentPos.value.longitude.toFixed(6)}`,icon: "none"});
   };
   </script><style scoped>
   .map-container {width: 100%;height: 100vh;position: relative;
   }.center-marker {position: absolute;top: 50%;left: 50%;transform: translate(-50%, -50%);width: 20px;height: 20px;background-color: #5ca7fc;border-radius: 50%;border: 2px solid white;z-index: 999;
   }.info-box {position: absolute;top: 20%;left: 50%;transform: translateX(-50%);background: rgba(255, 255, 255, 0.9);padding: 12px 16px;border-radius: 8px;width: 80%;box-shadow: 0 2px 8px rgba(0,0,0,0.1);
   }.info-box.out-of-range {background: rgba(255, 240, 240, 0.9);
   }.coords {font-size: 12px;color: #666;margin: 8px 0;
   }.error {color: #f56c6c;font-weight: bold;
   }.recenter-btn, .confirm-btn {margin-top: 10px;padding: 8px 12px;border-radius: 4px;text-align: center;font-size: 14px;
   }.recenter-btn {background: #606266;color: white;
   }.confirm-btn {background: #409eff;color: white;
   }
   </style>

   四、總結

   本文分步驟詳細講解了如何使用Uni-app實現地圖位置選擇功能，從基礎配置到完整實現，重點介紹了：

• 地圖基礎配置方法

• 多邊形區域繪制與判斷

• 交互邏輯的實現

• 覆蓋層UI的開發技巧

• .moveToLocation移動api 只有在真機才能實現，微信開發者工具不支持

• 可直接復制完整代碼到單頁測試運行,歡迎補充問題

五、實現效果