iOS项目开发实战——使用CoreLocation实现定位

      CoreLocation是苹果官方提供的一个框架，可以实现很多地理位置操作上的功能。比如地图显示，定位，地理位置编码等。现在我们来实现定位功能。

（1）代码实现如下：

#import "ViewController.h"
#import <MapKit/MapKit.h>

@interface ViewController ()<CLLocationManagerDelegate>

@property (nonatomic,strong) MKMapView *mapView;
@property (nonatomic,strong) CLLocationManager *locationManager;


@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];

  _mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];
  
  [_mapView setShowsUserLocation:true];
  
  [_mapView setMapType:MKMapTypeStandard];
  [self.view addSubview:_mapView];
  
  //监测定位功能是否开启
  if ([CLLocationManager locationServicesEnabled]) {
    
    NSLog(@"已经开启定位");
    
    if (!_locationManager) {
      _locationManager = [[CLLocationManager alloc] init];
      
      
      if ([_locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
        
        [_locationManager requestWhenInUseAuthorization];
        
        [_locationManager requestAlwaysAuthorization];
        
      }
      
      
      
      //设置代理；
      [_locationManager setDelegate:self];
      
      
      //设置定位精度；
      [_locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
      
      //设置距离筛选；
      [_locationManager setDistanceFilter:100];
      
      //开始定位；
      [_locationManager startUpdatingLocation];
      
    }
    
    
    
  }else{
  
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示"
                                                        message:@"您没有开启定位功能"
                                                       delegate:nil
                                              cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
    
    [alertView show];
    
  }
  
}


//授权状态发生改变的时候；
-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{

  switch (status) {
    case kCLAuthorizationStatusDenied:
    {
    
      NSLog(@"拒绝了授权");
    
      UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示"
                                                          message:@"您已经拒绝了授权"
                                                         delegate:nil cancelButtonTitle:@"确定"
                                                otherButtonTitles:nil, nil];
      
      [alertView show];
    }

           
      break;
      
    default:
      break;
  }
  
}

//定位成功以后调用
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{

  CLLocation *location = locations.lastObject;
  
  MKCoordinateRegion coordinateRegion = MKCoordinateRegionMake(CLLocationCoordinate2DMake(location.coordinate.latitude, location.coordinate.longitude), MKCoordinateSpanMake(0.1, 0.1));
  
  [_mapView setRegion:[_mapView regionThatFits:coordinateRegion] animated:true];
  
}

//定位失败以后调用
-(void) locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{

  
  NSLog(@"error:%@",error);
  
}


- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
}

@end

（2）在模拟器下运行，效果如下:本人在中国，却给我定位到美国了，可见使用模拟器来测试非常的不靠谱。

。

下面是在真机中运行，定位较为准确：

。

github主页：https://github.com/chenyufeng1991  。欢迎大家访问！