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简介
在 iOS 系统中，我们可以很容易地找到用户的当前位置，用户允许应用程序访问的核心位置框架的帮助信息。
涉及的步骤
1. 创建一个简单的 View based application.
2. 选择项目文件，然后选择目标，然后添加如下所示 CoreLocation.framework。
3. 添加两个标签在ViewController.xib并创建 ibOutlets 命名标签分别为 latitudeLabel 和 longitudeLabel。
4. 现在创建一个新的文件，通过选择 File-> New -> File... -> select Objective-C类并点击 next
5. 命名类为 LocationHandler ，并设置为 NSObject 的子类.
6. 选择创建
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 |
8. 现在更新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 |
9. 如下更新 ViewController.h 我们实现了 LocationHandler 委托并创建两个 ibOutlets。
#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：
#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
现在，当我们运行程序时，我们会得到下面的输出。
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