iOS CoreLocation未获取GPS坐标

所以我是iOS开发新手，我只是想用我当前的GPS坐标更新一个标签。我的编译没有问题，但我的坐标显示为

0.00000，0.00000

以下是my.h文件的代码：

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


@interface ViewController : UIViewController{
    IBOutlet CLLocationManager *locationManager;
    IBOutlet UILabel *location;
}

//@property (nonatomic, retain) IBOutlet CLLocationManager *locationManager;
//@property (weak, nonatomic) IBOutlet UILabel *location;
@end

---

不要使用

locationManager.location.coordinate.latitude

，而是保留类型为

CLLocationCoordinate2D

的实例变量。您可以将其称为类似于

currentLocation

。然后，当您在委托方法

locationManager:didUpdateLocations:

中获得一个值时，设置

currentLocation

的值

您必须调用

[locationManager startUpdatingLocation]

并设置其委托（以及实现该委托方法）

您目前使用位置管理器的方式是错误的，我认为您最好按照教程了解基本知识。

修复了它：

我没有实现任何委托方法，也没有实现[locationManager startUpdatingLocation]。现在我更清楚了

.h文件：

@interface MapViewController : UIViewController <CLLocationManagerDelegate>
@property (nonatomic, retain) IBOutlet CLLocationManager *locationManager;
@property (strong, nonatomic) IBOutlet UILabel *location;
@end

---

谢谢你指出我有多傻。我明白了。谢谢大家

像这样尝试一次，在ViewDidLoad中：

    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = (id)self;
    locationManager.distanceFilter = kCLDistanceFilterNone;
    locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
    [locationManager startUpdatingLocation];
    [self updateLabel];

使用此委托方法，否则将得到0个值：

 - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
   //No need to do any code...
   // NSLog(@"Got location %f,%f", newLocation.coordinate.latitude,   newLocation.coordinate.longitude);

 }

在更新标签方法中：

- (void) updateLabel
{
   //Getting Current Latitude and longitude..

    CLLocation *location = [locationManager location];
    float longitude=location.coordinate.longitude;
    float latitude=location.coordinate.latitude;
    NSLog(@"latitude,longitudes are >> %f,%f",latitude,longitude);
    locationlabel.text =  [NSString stringWithFormat:@"%f,%f",longitude,latitude];


  } 

---

我发现将location用作singleton并将值保存到defaultuser中非常有趣。我是一名年轻的程序员，正在尝试用oop编写所有代码。我的用法如下（这段代码仍需要重构，并且alertUserWithTitle:是NYMessageToUser的一个类方法，用于提醒用户）：

/##头文件：
@接口nLocationManager:NSObject
{
CLLocationManager*locationManager；
漂浮的孤独；
浮动纬度；
漂浮高度；
}
@财产（非原子，保留）CLLocationManager*locationManager；
@属性（非原子，读写）浮点经度；
@属性（非原子，读写）浮点纬度；
@属性（非原子，读写）浮点高度；
+（nLocationManager*）getInstance；
-（无效）启动日期地点；
-（void）停止更新位置；
-（double）GetDistanceFromUserLocation to Coordination Slatitude:（float）纬度经度：（float）lon；
@结束
//###实施文件：
@实现NYLocationManager
@综合定位经理；
@综合纬度；
@综合经度；
@综合海拔高度；
+（id）getInstance
{
静态NYLocationManager*实例=nil；
静态调度一次；
一次发送（一次发送）^{
实例=[[self alloc]init]；
});
[实例startUpdatingLocation]；
返回实例；
}
-（id）init
{
if（self=[super init]）
{
纬度=0.0；
经度=0.0；
海拔=0.0；
如果（[[NSUserDefaults standardUserDefaults]objectForKey:@“LocationLength”]！=nil）
{
NSUserDefaults*savedLocation=[NSUserDefaults standardUserDefaults]；
纬度=[[savedLocation objectForKey:@“locationLatitude”]floatValue]；
经度=[[savedLocation objectForKey:@“Location经度”]floatValue]；
海拔高度=[[savedLocation objectForKey:@“locationAltitude”]floatValue]；
}
locationManager=[[CLLocationManager alloc]init]；
locationManager.distanceFilter=KCLDistanceFilterOne；
locationManager.desiredAccuracy=KCallocationAccuracyHundredMeters；
locationManager.delegate=self；
如果（[CLLocationManager LocationServiceEnabled]）
{
[locationManager startUpdatingLocation]；
}否则
{
[NYMessageToUser alertUserWithTitle:@“位置服务已禁用！！！”withMessage:@“此应用旨在与位置共享图像，请为此应用启用位置并重新启用应用”]；
}
}
回归自我；
}
-（无效）解除锁定
{
//永远不应该被称为，但只是在这里澄清真的。
}
-（无效）位置管理器：（CLLocationManager*）管理器更新位置：（NSArray*）位置
{
CLLocation*loc=[locations lastObject]；
self.longitude=位置坐标经度；
自纬度=位置坐标纬度；
自身高度=定位高度；
NSUserDefaults*savedLocation=[NSUserDefaults standardUserDefaults]；
[savedLocation setObject:[NSString stringWithFormat:@“%f”，self.longitude]forKey:@“locationLongitude”]；
[savedLocation setObject:[NSString stringWithFormat:@“%f”，self.latitude]forKey:@“locationLatitude”]；
[savedLocation setObject:[NSString stringWithFormat:@“%f”，self.altime]forKey:@“LocationAltiment”]；
[保存位置同步]；
[locationManager停止更新位置]；
}
-（无效）locationManager:（CLLocationManager*）manager错误：（N错误*）错误{
[locationManager停止更新位置]；
[NYMessageToUser alertUserWithTitle:@“位置错误！！！”withMessage:@“此应用旨在与有效位置一起使用，请为此应用启用位置并重新选中应用”]；
}
-（无效）启动日期位置
{
如果（[CLLocationManager LocationServiceEnabled]）
{
[locationManager startUpdatingLocation]；
}否则
{
[NYMessageToUser alertUserWithTitle:@“位置服务已禁用！！！”withMessage:@“此应用旨在与位置共享图像，请为此应用启用位置并重新启用应用”]；
}
}
-（void）停止更新位置
{
[locationManager停止更新位置]；
}
-（双精度）GetDistanceFromUserLocationToCoordinationSlatitude:（浮点）纬度经度：（浮点）lon
{
CLLocation*locA=[[CLLocation alloc]initWithLatitude:self.latitude经度：self.latitude]；
CLLocation*locB=[[CLLocation alloc]initWithLatitude:lat经度：lon]；
CLLocationDistance距离=[locA distanceFromLocation:locB]；
返回距离；
}
@结束
//###如何使用
NYLocationManager*loc=[NYLocationManager getInstance]；
NSLog（@“经度：%f，纬度：%f，海拔：%f”，位置经度，位置纬度，位置海拔）；

在哪个点d

 - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
   //No need to do any code...
   // NSLog(@"Got location %f,%f", newLocation.coordinate.latitude,   newLocation.coordinate.longitude);

 }

- (void) updateLabel
{
   //Getting Current Latitude and longitude..

    CLLocation *location = [locationManager location];
    float longitude=location.coordinate.longitude;
    float latitude=location.coordinate.latitude;
    NSLog(@"latitude,longitudes are >> %f,%f",latitude,longitude);
    locationlabel.text =  [NSString stringWithFormat:@"%f,%f",longitude,latitude];


  } 

//##Header file:
@interface NYLocationManager : NSObject<CLLocationManagerDelegate>
{
    CLLocationManager *locationManager;
    float lonngitude;
    float latitude;
    float altitude;
}
@property(nonatomic,retain)CLLocationManager *locationManager;
@property(nonatomic,readwrite)float longitude;
@property(nonatomic,readwrite)float latitude;
@property(nonatomic,readwrite)float altitude;

+(NYLocationManager *) getInstance;

-(void)startUpdatingLocation;
-(void)stopUpdatingLocation;
-(double)getDistanceFromUserLocationToCordinatesLatitude:(float)lat Longitude:(float)lon;

@end




//### implementation file: 

@implementation NYLocationManager

@synthesize locationManager;
@synthesize latitude;
@synthesize longitude;
@synthesize altitude;

+ (id)getInstance
{
    static NYLocationManager *Instance = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        Instance = [[self alloc] init];
    });
    [Instance startUpdatingLocation];
    return Instance;
}

- (id)init
{
    if (self = [super init])
    {

        latitude    =0.0;
        longitude   =0.0;
        altitude    =0.0;
        if([[NSUserDefaults standardUserDefaults] objectForKey:@"locationLongitude"] != nil)
        {
            NSUserDefaults *savedLocation=[NSUserDefaults standardUserDefaults];
            latitude    =[[savedLocation objectForKey:@"locationLatitude"] floatValue];
            longitude   =[[savedLocation objectForKey:@"locationLongitude"] floatValue];
            altitude    =[[savedLocation objectForKey:@"locationAltitude"] floatValue];
        }
        locationManager = [[CLLocationManager alloc] init];
        locationManager.distanceFilter  = kCLDistanceFilterNone;
        locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
        locationManager.delegate        = self;
        if ([CLLocationManager locationServicesEnabled])
        {
            [locationManager startUpdatingLocation];
        } else
        {
            [NYMessageToUser  alertUserWithTitle:@"Location Services is Disabled!!!" withMessage:@"This app is designed to share images with location, Please enable location for this app and relucnh the app"];
        }
    }
    return self;
}

- (void)dealloc
{
    // Should never be called, but just here for clarity really.
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    CLLocation *loc =[locations lastObject];
    self.longitude  =loc.coordinate.longitude;
    self.latitude   =loc.coordinate.latitude;
    self.altitude   =loc.altitude;
    NSUserDefaults *savedLocation=[NSUserDefaults standardUserDefaults];
    [savedLocation setObject: [NSString stringWithFormat:@"%f", self.longitude] forKey:@"locationLongitude"];
    [savedLocation setObject: [NSString stringWithFormat:@"%f", self.latitude] forKey:@"locationLatitude"];
    [savedLocation setObject: [NSString stringWithFormat:@"%f", self.altitude ] forKey:@"locationAltitude"];
    [savedLocation synchronize];

    [locationManager stopUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    [locationManager stopUpdatingLocation];
    [NYMessageToUser alertUserWithTitle:@"Location Error!!!" withMessage:@"This app is designed to use with valid location, Please enable location for this app and relucnh the app"];
}
-(void)startUpdatingLocation
{
    if ([CLLocationManager locationServicesEnabled])
    {
        [locationManager startUpdatingLocation];
    } else
    {
        [NYMessageToUser alertUserWithTitle:@"Location Services is Disabled!!!" withMessage:@"This app is designed to share images with location, Please enable location for this app and relucnh the app"];
    }
}

-(void)stopUpdatingLocation
{
    [locationManager stopUpdatingLocation];
}
-(double)getDistanceFromUserLocationToCordinatesLatitude:(float)lat Longitude:(float)lon
{
    CLLocation *locA = [[CLLocation alloc] initWithLatitude:self.latitude longitude:self.longitude];

    CLLocation *locB = [[CLLocation alloc] initWithLatitude:lat longitude:lon];

    CLLocationDistance distance = [locA distanceFromLocation:locB];
    return distance;
}
@end 




//### How to use



NYLocationManager *loc  =[NYLocationManager getInstance];
 NSLog(@"longitude: %f, latitude: %f, altitude: %f",loc.longitude,loc.latitude,loc.altitude);