我有这段代码:-(void)viewDidLoad{[superviewDidLoad];CLLocationCoordinate2DuserLocation=CLLocationCoordinate2DMake(48.9793946200,2.4726272850);CLLocationDistancedist1=636.9887048804;CLLocationDistancedist2=900.8380655203;CLLocationDistancedist=dist1;[self.myMapViewsetRegion:MKCoordinateRegionMakeWithDis

MapKit的内置函数MKCoordinateRegionMakeWithDistance获取以米为单位的距离并将它们转换为MKCoordinateRegion:funcMKCoordinateRegionMakeWithDistance(_centerCoordinate:CLLocationCoordinate2D,_latitudinalMeters:CLLocationDistance,_longitudinalMeters:CLLocationDistance)->MKCoordinateRegion是否有一个反向函数接受MKCoordinateRegion并给我latitu

我们可以在iPhone的map上设置特定位置的周边区域，如下所示CLLocationCoordinate2Dcoord={latitude:37.09024,longitude:-95.712891};CLLocationDistancelatitudinalMeters;latitudinalMeters=NoOfMiles*1609.344;CLLocationDistancelongitudinalMeters;longitudinalMeters=NoOfMiles*1609.344;mapViewHome.region=MKCoordinateRegionMakeWithDi