CLLocationManager 获取 GPS 位置信息

 http://magicalboy.com/ios_gps_location/

 

在 iOS 平台上使用 CLLocationManager 获取 GPS 位置信息，比如经度，纬度，海拔高度等是很简单的事情。

步骤

1. 加入 CoreLocation.framework , 导入头文件。

   #import <CoreLocation/CoreLocation.h>

2. 在 AppDelegate.m 中加入检测是否启用位置服务功能。
   
   CLLocationManager *manager = [[CLLocationManager alloc] init];

       if (manager.locationServicesEnabled == NO) {

           UIAlertView *servicesDisabledAlert = [[UIAlertView alloc] initWithTitle:@"Location Services Disabled" message:@"You currently have all location services for this device disabled. If you proceed, you will be asked to confirm whether location services should be reenabled." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];

           [servicesDisabledAlert show];

           [servicesDisabledAlert release];

       }

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1. 打开位置管理器。
   
   - (IBAction)openGPS:(id)sender {

       if (locationManager == nil) {

           locationManager = [[CLLocationManager alloc] init];

           locationManager.delegate = self;

           locationManager.desiredAccuracy = kCLLocationAccuracyBest; // 越精确，越耗电！

       }

       

       [locationManager startUpdatingLocation]; // 开始定位

   }

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2. 在 CLLocationManagerDelegate 中获取 GPS 位置信息。
   
   #pragma mark - CLLocationManagerDelegate

   - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {

       switch (error.code) {

           case kCLErrorLocationUnknown:

               NSLog(@"The location manager was unable to obtain a location value right now.");

               break;

           case kCLErrorDenied:

               NSLog(@"Access to the location service was denied by the user.");

               break;

           case kCLErrorNetwork:

               NSLog(@"The network was unavailable or a network error occurred.");

               break;

           default:

               NSLog(@"未定义错误");

               break;

       }

   }

    

   - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

   {

       NSLog(@"oldLocation.coordinate.timestamp:%@", oldLocation.timestamp);

       NSLog(@"oldLocation.coordinate.longitude:%f", oldLocation.coordinate.longitude);

       NSLog(@"oldLocation.coordinate.latitude:%f", oldLocation.coordinate.latitude);

       

       NSLog(@"newLocation.coordinate.timestamp:%@", newLocation.timestamp);

       NSLog(@"newLocation.coordinate.longitude:%f", newLocation.coordinate.longitude);

       NSLog(@"newLocation.coordinate.latitude:%f", newLocation.coordinate.latitude);

       

       NSTimeInterval interval = [newLocation.timestamp timeIntervalSinceDate:oldLocation.timestamp];

       NSLog(@"%lf", interval);

       

       // 取到精确GPS位置后停止更新

       if (interval < 3) {

           // 停止更新

           [locationManager stopUpdatingLocation];

       }

       

       latitudeLabel.text = [NSString stringWithFormat:@"%f", newLocation.coordinate.latitude];

       longitudeLabel.text = [NSString stringWithFormat:@"%f", newLocation.coordinate.longitude];

   }

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完整 Demo

GPS_iOS