iOS startUpdatingLocation从未调用

Question

我一直在尝试获取位置坐标。 在我调用[locationManager startUpdatingLocation]; 什么都没发生。

它从不调用- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations;

有什么想法吗？

注意：我已经设置了CLLocationManagerDelegate ，并将我的CLLocationManager类型设置为strong 。 在我的viewDidLoad我设置了Delegate，并且尝试使用requestAlwaysAuthorization 。

ViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];


    NSLog(@"locationServicesEnabled: %@", [CLLocationManager locationServicesEnabled] ? @"YES":@"NO");
    NSLog(@"locationManager init");
    NSLog(@"geocoder init");
    locationManager = [[CLLocationManager alloc] init];
    geocoder = [[CLGeocoder alloc] init];

    //locationManager.delegate = self;
    [locationManager setDelegate:self];
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [locationManager requestAlwaysAuthorization];

    NSLog(@"locationManager startUpdatingLocation");
    [locationManager startUpdatingLocation];
}

#pragma mark - CLLocationManagerDelegate

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"locationManager:manager");
    NSLog(@"didFailWithError: %@", error);
    UIAlertView *errorAlert = [[UIAlertView alloc]
                               initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [errorAlert show];
}

- (void)locationManager:(CLLocationManager *)manager
     didUpdateLocations:(NSArray *)locations;
{
    NSLog(@"locations %@", locations);

    CLLocation *newLocation = [locations lastObject];
    NSLog(@"didUpdateToLocation: %@", newLocation);
    CLLocation *currentLocation = newLocation;

    if (currentLocation != nil) {
        longitude = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
        latitude = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];
    }

    // Stop Location Manager
    [locationManager stopUpdatingLocation];

    // Reverse Geocoding
    NSLog(@"Resolving the Address");
    [geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error) {
        NSLog(@"Found placemarks: %@, error: %@", placemarks, error);
        if (error == nil && [placemarks count] > 0) {
            placemark = [placemarks lastObject];
            locationLabel.text = [NSString stringWithFormat:@"%@, %@",
                                 placemark.locality,
                                 placemark.administrativeArea];
        } else {
            NSLog(@"%@", error.debugDescription);
        }
    } ];

}

ViewController.h

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

@interface ViewController : UIViewController <CLLocationManagerDelegate>

@property (strong, nonatomic) CLLocationManager *locationManager;
@property (strong, nonatomic) CLGeocoder *geocoder;
@property (strong, nonatomic) CLPlacemark *placemark;

日志记录

2014-09-24 08:18:39.783 appName[1201:130186] locationServicesEnabled: YES
2014-09-24 08:18:39.784 appName[1201:130186] locationManager init
2014-09-24 08:18:39.784 appName[1201:130186] geocoder init
2014-09-24 08:18:39.785 appName[1201:130186] locationManager startUpdatingLocation

我也尝试过删除[locationManager stopUpdatingLocation]; 而且它仍然什么也没做。

其他说明：如果我检查设备设置/隐私，则表明我的应用确实具有位置权限。 我的所有.h属性在.m文件中都正确@synthesize 。

Answer 1

如果您使用的是iOS 8，则需要在调用[locationManager startUpdatingLocation];之前调用以下方法之一： -[CLLocationManager requestWhenInUseAuthorization]或-[CLLocationManager requestAlwaysAuthorization] [locationManager startUpdatingLocation]; 第一。

您还需要在.plist中为这些键NSLocationUsageDescription ， NSLocationWhenInUseUsageDescription和NSLocationAlwaysUsageDescription