iOS - 位置处理

  • 简述

    我们可以很容易地在 iOS 中定位用户的当前位置,前提是用户允许应用程序在核心位置框架的帮助下访问信息。
  • 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 -
    iOS 教程
    步骤 3 - 在中添加两个标签 ViewController.xib 并创建 ibOutlets 将标签命名为 latitudeLabellongitudeLabel 分别。
    步骤 4 − 通过选择 File → New → File... 创建一个新文件 → select Objective C class 然后点击下一步。
    步骤 5 - 将类命名为 LocationHandler"sub class of" 作为 NSObject。
    步骤 6 − 选择创建。
    步骤 7 − 更新 LocationHandler.h 如下 -
    
    #import <Foundation/Foundation.h>
    #import <CoreLocation/CoreLocation.h>
    @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
    
    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 如下我们已经实现了 LocationHandler delegate 并创建两个 ibOutlets -
    
    #import <UIKit/UIKit.h>
    #import "LocationHandler.h"
    @interface ViewController : UIViewController<LocationHandlerDelegate> {
       IBOutlet UILabel *latitudeLabel;
       IBOutlet UILabel *longitudeLabel;
    }
    @end
    
    步骤 10 − 更新 ViewController.m 如下 -
    
    #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

    当我们运行应用程序时,我们将获得以下输出 -
    iOS 教程