9.31. IOS positioning operation

发布时间 ： 2025-10-25 13:32:30 UTC      

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9.31.1. Brief introduction

Through CoreLocation positioning in IOS, the current location of the user can be obtained, and the device movement information can be obtained at the same time.

9.31.2. Instance step

1、创建一个简单的View based application（视图应用程序）。

2、择项目文件，然后选择目标，然后添加CoreLocation.framework,如下所示

CoreLocation_Library_Addition

3、在ViewController.xib中添加两个标签，创建ibOutlet名为latitudeLabel和longtitudeLabel的标签

4、现在通过选择” File-> New -> File… -> “选择Objective C class 并单击下一步

5、把”sub class of”作为NSObject，将类命名为LocationHandler

6、选择创建

7、更新LocationHandler.h，如下所示

#import 
#import 

@protocol LocationHandlerDelegate <NSObject>

@required
-(void) didUpdateToLocation:(CLLocation*)newLocation
 fromLocation:(CLLocation*)oldLocation;
@end

@interface LocationHandler : NSObject<CLLocationManagerDelegate>
{
    CLLocationManager *locationManager;
}
@property(nonatomic,strong) id<LocationHandlerDelegate> delegate;

+(id)getSharedInstance;
-(void)startUpdating;
-(void) stopUpdating;

@end
   
 8、更新LocationHandler.m,如下所示 
 
 
 
#import "LocationHandler.h"
static LocationHandler *DefaultManager = nil;

@interface LocationHandler()

-(void)initiate;

@end

@implementation LocationHandler

+(id)getSharedInstance{
    if (!DefaultManager) {
        DefaultManager = [[self allocWithZone:NULL]init];
        [DefaultManager initiate];
    }
    return DefaultManager;
}
-(void)initiate{
    locationManager = [[CLLocationManager alloc]init];
    locationManager.delegate = self;
}

-(void)startUpdating{
    [locationManager startUpdatingLocation];
}

-(void) stopUpdating{
    [locationManager stopUpdatingLocation];
}
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:
 (CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
    if ([self.delegate respondsToSelector:@selector
    (didUpdateToLocation:fromLocation:)])
    {
        [self.delegate didUpdateToLocation:oldLocation
        fromLocation:newLocation];

    }
}

@end

 
 
 
 9、更新ViewController.h,如下所示 
 
 
 
#import 
#import "LocationHandler.h"
@interface ViewController : UIViewController<LocationHandlerDelegate>
{
    IBOutlet UILabel *latitudeLabel;
    IBOutlet UILabel *longitudeLabel;
}
@end
   
 10、更新ViewController.m,如下所示 
 
 
 
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    [[LocationHandler getSharedInstance]setDelegate:self];
    [[LocationHandler getSharedInstance]startUpdating];
}

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

-(void)didUpdateToLocation:(CLLocation *)newLocation
 fromLocation:(CLLocation *)oldLocation{
    [latitudeLabel setText:[NSString stringWithFormat:
    @"Latitude: %f",newLocation.coordinate.latitude]];
    [longitudeLabel setText:[NSString stringWithFormat:
    @"Longitude: %f",newLocation.coordinate.longitude]];

}

@end

 
 
  
 
  9.31.3.  Output  
 
 When we run the application, we get the following output: 
 
  locationOutput  
 
  
                    
                
                

                    

                        

                            
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                            9.31. IOS positioning operation 
                        

                    

                

            
        
        

            

    
        

            

                

                    
                        
                        
                            
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