在Objective-C中实现iPhone位置 [英] Implementing iPhone Location in Objective-C

问题描述

我一直试图学习如何在Objective-C中实现iPhone的位置.目前，我有几个文件:

So ive been trying to learn how to implement iPhone location in Objective-C. Currently I have several files:

locator.h

#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>

@interface locator : NSObject
- (void)locationManager:(CLLocationManager *)manager;
@end

locator.m

#import "locator.h"
#import <CoreLocation/CoreLocation.h>

@implementation locator
- (void)locationManager:(CLLocationManager *)manager
    didUpdateToLocation:(CLLocation *)newLocation
           fromLocation:(CLLocation *)oldLocation {
    CLLocationDegrees latitude = newLocation.coordinate.latitude;
    CLLocationDegrees longitude = newLocation.coordinate.longitude;
}
@end

viewController.h

#import <UIKit/UIKit.h>
#import "locator.h"

@interface ViewController : UIViewController
@end

viewController.m

#import "ViewController.h"
#import "locator.h"
#import <CoreLocation/CoreLocation.h>

@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
    CLLocationManager *locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self; // Set your controller as a <CLLocationManagerDelegate>.
    [locationManager startUpdatingLocation];
    [super viewDidLoad];
}
@end

我肯定我自己有时犯了一个重大错误，但是我很困惑，根本不了解它是什么.我在尝试运行此程序时遇到2个主要错误.

Im sure ive made a major error sometimes but im quite confused and dont really understand what it is. Im getting 2 major errors when trying to run this.

推荐答案

通常，我将CLLocationManager设置为类变量，如下所示:

Usually I would make the CLLocationManager a class variable like so:

@interface ViewController : UIViewController <CLLocationManagerDelegate>

@property (strong, nonatomic) CLLocationManager *locationManager

@end

然后您将可以拨打电话:

Then you will be able to call:

[self.locationManager stopUpdatingLocation];

在您想要的时候.另外，您还需要实现:

when you desire. Also you need to implement:

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {

}

在您的ViewController中，以接收具有位置数据的委托回调.

In your viewcontroller to receive the delegate callback that has the location data.

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