新手小白必学之IOS定位操作

我不是女神ヾ 2021-12-10 11:23 349阅读 0赞

对于初次学习iOS开发的新手小白来说，IOS定位操作是十分关键的，下面简单介绍一下：

## 简介 ##

在IOS中通过CoreLocation定位，可以获取到用户当前位置，同时能得到装置移动信息。

### 实例步骤 ###

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][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 <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

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 <UIKit/UIKit.h>
    #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

### 输出 ###

当我们运行该应用程序，会得到如下的输出:

![locationOutput][]

[CoreLocation_Library_Addition]: /images/20211210/2ec2644b71974ed7b3c9bb086da32a1c.png
[locationOutput]: /images/20211210/ecc1cd03e6a04332a1a4b6f91bd1c9ef.png