CLLocationManager不会向didUpdateLocations方法发送位置

Question

我正在iOS 6.1 iPhone app使用ARC启用它将使用a CLLocationManager来跟踪设备位置.

UPDATE

我有一个DestinationViewController实现了CLLocationManagerDelegate.它创建CLLocationManager并进行设置.我已经导入了CoreLocation framework我的项目.

我试图调试很多,可以看到它CLLocationManager已创建,并且没有错误.但问题是,[CLLocationManager authorizationStatus]是kCLAuthorizationStatusNotDetermined 双方之前[self.locationManager startUpdatingLocation];也经过.因此,没有提示要求为此应用程序使用位置服务的权限.因此,这种方法永远不会被解雇.

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:  
(NSArray *)locations

我也尝试在网上搜索几个小时来寻找类似的例子,但没有运气.DestinationViewController中的代码发布在下面.

接口

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

@interface DestinationViewController : UIViewController <CLLocationManagerDelegate>

履行

#import "DestinationViewController.h"

@interface DestinationViewController ()
@property (strong, nonatomic) CLLocationManager *locationManager;
@end


@implementation DestinationViewController

// Initializer
- (CLLocationManager *)locationManager
{
    if (!_locationManager) {
        _locationManager = [[CLLocationManager alloc] init];
    }
    return _locationManager;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self startLocation];
}


- (void)startLocation
{
    self.locationManager.delegate = self;
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    self.locationManager.distanceFilter = 1;

    NSString *error;
    if (![CLLocationManager locationServicesEnabled]) {
        error = @"Error message";
    }

    CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
    if (status == kCLAuthorizationStatusRestricted ||
        status == kCLAuthorizationStatusDenied ||) {
        error = @"Error message";
    }

    if (error) {
        NSLog(error);
    }
    else
    {

        status = [CLLocationManager authorizationStatus];

    self.locationManager.pausesLocationUpdatesAutomatically = NO;

        [self.locationManager startUpdatingLocation];

        status = [CLLocationManager authorizationStatus];

        NSLog(@"CLLocationManager is %@", self.locationManager);
        NSLog(@"Location is %@", self.locationManager.location);

        [self updateUI];
    }
}


- (void)locationManager:(CLLocationManager *)manager
     didUpdateLocations:(NSArray *)locations
{
    CLLocation *recentLocation = [locations lastObject];
    NSLog(@"Found location");
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"didFailWithError");
}

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
    NSLog(@"Change in authorization status");
}

Answer 1

你的代码应该有效.

确保您的应用程序有权使用位置服务.

您可以使用以下方法检查代码中的授权状态

 + (CLAuthorizationStatus)authorizationStatus

编辑

kCLAuthorizationStatusNotDetermined很可能是由禁用位置服务引起的.您应该首先检查位置服务状态.代码应该是这样的

if([CLLocationManager locationServicesEnabled]) {
    // Location Services Are Enabled
    switch([CLLocationManager authorizationStatus]) {
        case kCLAuthorizationStatusNotDetermined:
            // User has not yet made a choice with regards to this application
            break;
        case kCLAuthorizationStatusRestricted:
            // This application is not authorized to use location services.  Due
            // to active restrictions on location services, the user cannot change
            // this status, and may not have personally denied authorization
            break;
        case kCLAuthorizationStatusDenied:
            // User has explicitly denied authorization for this application, or
            // location services are disabled in Settings
            break;
        case kCLAuthorizationStatusAuthorized:
            // User has authorized this application to use location services
            break;
    }
} else {
    // Location Services Disabled
}