iOS开发：地图与社交网络功能实现

### iOS开发：地图与社交网络功能实现 #### 地图功能实现 在iOS 6中，引入了名为`MKMapItem`的新API，这使得与内置地图应用进行交互变得轻而易举。开发者无需自行构建不完善的地图功能，只需几行代码，就能将用户引导至专业的地图和导航应用。 ##### 从应用启动地图 我们可以创建一个简单的应用，包含三个按钮，以不同方式启动地图应用。具体步骤如下： 1. 创建一个新的单视图应用，并将`Map Kit`和`Core Location`框架链接到该应用。 2. 在视图控制器的用户界面中添加三个按钮，标题分别为“Start Maps With One Placemark”、“Start Maps With Multiple Placemarks”和“Start Maps in Directions Mode”。 3. 为这三个按钮分别创建动作方法，命名为`startWithOnePlacemark`、`startWithMultiplePlacemarks`和`startInDirectionsMode`。 以下是具体的代码实现： ```objc // 启动单个地点的地图 - (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]; } // 启动多个地点的地图 - (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]; } // 启动导航模式 - (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 *options = @{MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeWalking}; [MKMapItem openMapsWithItems:items launchOptions:options]; } ``` ##### 注册路由应用 在iOS 6中，除了