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iOS地图定位使用几个小功能

iOS系统自带的定位服务可以实现很多需求。比如：获取当前经纬度，获取当前位置信息等等。

获取当前经纬度

首先导入#import <CoreLocation/CoreLocation.h>，定义CLLocationManager的实例，实现CLLocationManagerDelegate。

@interface ViewController ()<CLLocationManagerDelegate> {     CLLocationManager *_locationManager; }  @end

开始定位的方法：

- (void)startLocating {  if([CLLocationManager locationServicesEnabled])  {   _locationManager = [[CLLocationManager alloc] init];   //设置定位的精度   [_locationManager setDesiredAccuracy:kCLLocationAccuracyBest];   _locationManager.distanceFilter = 100.0f;   _locationManager.delegate = self;   if ([[[UIDevice currentDevice] systemVersion] floatValue] > 8.0)   {    [_locationManager requestAlwaysAuthorization];    [_locationManager requestWhenInUseAuthorization];   }   //开始实时定位   [_locationManager startUpdatingLocation];  } }

实现代理方法：

-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {     NSLog(@"Longitude = %f", manager.location.coordinate.longitude);     NSLog(@"Latitude = %f", manager.location.coordinate.latitude);     [_locationManager stopUpdatingLocation]; }

获取当前位置信息

在上面的代理方法中

-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {  NSLog(@"Longitude = %f", manager.location.coordinate.longitude);  NSLog(@"Latitude = %f", manager.location.coordinate.latitude);  [_locationManager stopUpdatingLocation];  CLGeocoder * geoCoder = [[CLGeocoder alloc] init];  [geoCoder reverseGeocodeLocation:manager.location completionHandler:^(NSArray *placemarks, NSError *error) {   for (CLPlacemark * placemark in placemarks) {    NSDictionary *test = [placemark addressDictionary];    //  Country(国家)  State(城市)  SubLocality(区)    NSLog(@"%@", [test objectForKey:@"Country"]);    NSLog(@"%@", [test objectForKey:@"State"]);    NSLog(@"%@", [test objectForKey:@"SubLocality"]);    NSLog(@"%@", [test objectForKey:@"Street"]);   }  }]; }

这样就很简单获取了当前位置的详细信息。

获取某一个地点的经纬度

- (void)getLongitudeAndLatitudeWithCity:(NSString *)city {  //city可以为中文  NSString *oreillyAddress = city;  CLGeocoder *myGeocoder = [[CLGeocoder alloc] init];  [myGeocoder geocodeAddressString:oreillyAddress completionHandler:^(NSArray *placemarks, NSError *error) {   if ([placemarks count] > 0 && error == nil)   {    NSLog(@"Found %lu placemark(s).", (unsigned long)[placemarks count]);    CLPlacemark *firstPlacemark = [placemarks objectAtIndex:0];    NSLog(@"Longitude = %f", firstPlacemark.location.coordinate.longitude);    NSLog(@"Latitude = %f", firstPlacemark.location.coordinate.latitude);   }   else if ([placemarks count] == 0 && error == nil)   {    NSLog(@"Found no placemarks.");   }   else if (error != nil)   {    NSLog(@"An error occurred = %@", error);   }  }]; }

计算两个地点之间的距离

- (double)distanceByLongitude:(double)longitude1 latitude:(double)latitude1 longitude:(double)longitude2 latitude:(double)latitude2{  CLLocation* curLocation = [[CLLocation alloc] initWithLatitude:latitude1 longitude:longitude1];  CLLocation* otherLocation = [[CLLocation alloc] initWithLatitude:latitude2 longitude:longitude2];  double distance  = [curLocation distanceFromLocation:otherLocation];//单位是m  return distance; }

首先我们可以用上面的getLongitudeAndLatitudeWithCity方法获取某一个地点的经纬度。比如我们获取北京和上海的经纬度分别为：北京Longitude = 116.405285，Latitude = 39.904989 上海Longitude = 121.472644， Latitude = 31.231706, 那么北京和上海之间的距离就是：

double distance = [self distanceByLongitude:116.405285 latitude:39.904989 longitude:121.472644 latitude:31.231706]; NSLog(@"Latitude = %f", distance);

计算的是大概的距离，可能没有那么精准。输入结果为：