📜  iOS-位置处理

📅  最后修改于: 2020-12-08 06:20:50             🧑  作者: Mango


只要用户允许应用程序在核心位置框架的帮助下访问信息,我们就可以在iOS中轻松找到用户的当前位置。

位置处理-涉及的步骤

步骤1-创建一个简单的基于视图的应用程序。

步骤2-选择您的项目文件,然后选择目标,然后添加CoreLocation.framework,如下所示-

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步骤3-ViewController.xib中添加两个标签,并创建ibOutlets,分别将标签命名为latitudeLabellongitudeLabel

步骤4-通过选择文件→新建→文件…→选择Objective C类来创建一个新文件,然后单击下一步。

第5步-将类命名为LocationHandler ,将“ sub class of”作为NSObject。

步骤6-选择创建。

步骤7-更新LocationHandler.h ,如下所示-

#import 
#import 

@protocol LocationHandlerDelegate 

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

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

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

@end

步骤8-更新LocationHandler.m如下-

#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

步骤9-更新ViewController.h ,如下所示,在其中我们实现了LocationHandler委托并创建两个ibOutlet-

#import 
#import "LocationHandler.h"

@interface ViewController : UIViewController {
   IBOutlet UILabel *latitudeLabel;
   IBOutlet UILabel *longitudeLabel;
}
@end

步骤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

输出

运行应用程序时,将获得以下输出-

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