iOS开发：地图与社交网络功能集成指南

### iOS开发：地图与社交网络功能集成指南 #### 一、地图功能集成 在iOS 6中，新的MKMapItem API让应用与内置地图应用的交互变得更加便捷。开发者无需自行开发不完善的地图功能，只需几行代码，就能将用户引导至专业的地图和导航应用。 ##### 1. 创建启动地图的简单应用 - **创建项目**：创建一个新的单视图应用，并链接Map Kit和Core Location框架。 - **添加按钮**：在视图控制器的用户界面添加三个按钮，分别命名为“Start Maps With One Placemark”、“Start Maps With Multiple Placemarks”和“Start Maps in Directions Mode”。 - **创建动作**：为这三个按钮分别创建动作，命名为startWithOnePlacemark、startWithMultiplePlacemarks和startInDirectionsMode。 ##### 2. 添加地图项 - **单个地图项启动地图** 1. **定义坐标**：以伦敦著名的大本钟为例，定义其坐标。 ```objc CLLocationCoordinate2D bigBenLocation = CLLocationCoordinate2DMake(51.50065200, -0.12483300); ``` 2. **创建地标**：使用坐标创建地标。 ```objc MKPlacemark *bigBenPlacemark = [[MKPlacemark alloc] initWithCoordinate:bigBenLocation addressDictionary:nil]; ``` 3. **创建地图项**：使用地标创建地图项，并设置名称。 ```objc MKMapItem *bigBenItem = [[MKMapItem alloc] initWithPlacemark:bigBenPlacemark]; bigBenItem.name = @"Big Ben"; ``` 4. **启动地图**：使用openInMapsWithLaunchOptions:方法启动地图。 ```objc [bigBenItem openInMapsWithLaunchOptions:nil]; ``` 完整的动作方法如下： ```objc - (IBAction)startWithOnePlacemark:(id)sender { CLLocationCoordinate2D bigBenLocation = CLLocationCoordinate2DMake(51.50065200, -0.12483300); MKPlacemark *bigBenPlacemark = [[MKPlacemark alloc] initWithCoordinate:bigBenLocation addressDictionary:nil]; MKMapItem *bigBenItem = [[MKMapItem alloc] initWithPlacemark:bigBenPlacemark]; bigBenItem.name = @"Big Ben"; [bigBenItem openInMapsWithLaunchOptions:nil]; } ``` - **多个地图项启动地图**：使用openMapsWithItems:launchOptions:类方法，传入地图项数组。 ```objc - (IBAction)startWithMultiplePlacemarks:(id)sender { CLLocationCoordinate2D bigBenLocation = CLLocationCoordinate2DMake(51.50065200, -0.12483300); MKPlacemark *bigBenPlacemark = [[MKPlacemark alloc] initWithCoordinate:bigBenLocation addressDictionary:nil]; MKMapItem *bigBenItem = [[MKMapItem alloc] initWithPlacemark:bigBenPlacemark]; bigBenItem.name = @"Big Ben"; CLLocationCoordinate2D westminsterLocation = CLLocationCoordinate2DMake(51.50054300, -0.13570200); MKPlacemark *westminsterPlacemark = [[MKPlacemark alloc] initWithCoordinate:westminsterLocation addressDictionary:nil]; MKMapItem *westminsterItem = [[MKMapItem alloc] initWithPlacemark:westminsterPlacemark]; westminsterItem.name = @"Westminster Abbey"; NSArray *items = [[NSArray alloc] initWithObjects:bigBenItem, westminsterItem, nil]; [MKMapItem openMapsWithItems:items launchOptions:nil]; } ``` ##### 3. 导航模式启动地图 在iOS 6中，地图应用新增了逐向导航功能。开发者可以通过设置选项字典，以导航模式启动地图。 ```objc - (IBAction)startInDirectionsMode:(id)sender { CLLocationCoordinate2D bigBenLocation = CLLocationCoordinate2DMake(51.50065200, -0.12483300); MKPlacemark *bigBenPlacemark = [[MKPlacemark alloc] initWithCoordinate:bigBenLocation addressDictionary:nil]; MKMapItem *bigBenItem = [[MKMapItem alloc] initWithPlacemark:bigBenPlacemark]; bigBenItem.name = @"Big Ben"; CLLocationCoordinate2D westminsterLocation = CLLocationCoordinate2DMake(51.50054300, -0.13570200); MKPlacemark *westminsterPlacemark = [[MKPlacemark alloc] initWithCoordinate:westminsterLocation addressDictionary:nil]; MKMapItem *westminsterItem = [[MKMapItem alloc] initWithPlacemark:westminsterPlacemark]; westminsterItem.name = @"Westminster Abbey"; NSArray *items = [[NSArray alloc] initWithObjects:bigBenItem, westminsterItem, nil]; NSDictionary *o ```