在 MapKit 中未获得用户的许可

Question

必须先致电-[CLLocationManager requestWhenInUseAuthorization] 或-[CLLocationManager requestAlwaysAuthorization]。实际上我已经在 Didload 中调用了这个方法，甚至在info.plist 中添加了这个方法，仍然出现这个错误。

    - (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationItem.title = @"MapView";

    [MapView setMapType:MKMapTypeStandard];
    [MapView setZoomEnabled:YES];
    [MapView setScrollEnabled:YES];
    [MapView setShowsUserLocation:YES];
    MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } };
    region.center.latitude = 23.0804 ;
    region.center.longitude = 72.5241;
    region.span.longitudeDelta = 0.01f;
    region.span.latitudeDelta = 0.01f;
    [MapView setRegion:region animated:YES];

    [MapView setDelegate:self];

    CLLocationManager *locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLDistanceFilterNone; //whenever we move
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;

    [locationManager requestAlwaysAuthorization];
    [locationManager requestWhenInUseAuthorization];

    [locationManager startUpdatingLocation];

    Display *ann = [[Display alloc] init];
    ann.title = @" Gujarat";
    ann.subtitle = @"High Court";
    ann.coordinate = region.center;
    [MapView addAnnotation:ann];

}
-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:
(id <MKAnnotation>)annotation {
    MKPinAnnotationView *pinView = nil;
    if(annotation != MapView.userLocation)
    {
        static NSString *defaultPinID = @"com.invasivecode.pin";
        pinView = (MKPinAnnotationView *)[MapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
        if ( pinView == nil ) pinView = [[MKPinAnnotationView alloc]
                                         initWithAnnotation:annotation reuseIdentifier:defaultPinID];

        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.canShowCallout = YES;
        pinView.animatesDrop = YES;
        pinView.draggable = YES;
    }
    else {
        [MapView.userLocation setTitle:@"I am here"];
    }
    return pinView;
}


-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status

{

    if (status == kCLAuthorizationStatusAuthorizedWhenInUse)
    {
        [locationManager startUpdatingLocation];
    }
    else if (status == kCLAuthorizationStatusDenied)
    {
        //Alert to show for user if any when status is declined
    }
    else
        NSLog(@"Wrong location status");
}

并在 Annotation 的 Display 类中

<MKAnnotation> {

    CLLocationCoordinate2D coordinate; 
    NSString *title; 
    NSString *subtitle;
}
@property (nonatomic, assign) CLLocationCoordinate2D coordinate; 
@property (nonatomic, copy) NSString *title; 
@property (nonatomic, copy) NSString *subtitle;

这里的代码没有显示提示用户是否允许访问其位置，因此我们无法获得所需位置的位置。请帮我从昨天开始。

Answer 1

在您的应用中检查以下内容。

1) 创建一个CLLocation Manager 的类对象。 因为如果您创建 CLLocation 管理器的本地对象，则 CLLocationManager 对象在用户响应对话框之前被释放。

2) 进入设置 > 隐私 > 定位服务。并检查您的应用是否列在位置服务列表中。如果是，则点击您的应用并进入内部检查开关是否打开。

3) 使用检查是否支持 requestAlwaysAuthorization:

if ([_locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
    [_locationManager requestAlwaysAuthorization];
}

4) 尝试检查位置管理器的状态使用

-(void)checkStatus{

CLAuthorizationStatus status = [CLLocationManager authorizationStatus];

if (status==kCLAuthorizationStatusNotDetermined) {
_status.text = @"Not Determined";
}

if (status==kCLAuthorizationStatusDenied) {
_status.text = @"Denied";
}

if (status==kCLAuthorizationStatusRestricted) {
_status.text = @"Restricted";
}

if (status==kCLAuthorizationStatusAuthorizedAlways) {
_status.text = @"Always Allowed";
}

if (status==kCLAuthorizationStatusAuthorizedWhenInUse) {
_status.text = @"When In Use Allowed";
  }

}

更多详情请访问

1) http://www.devfright.com/location-authorization-ios-8/
2)http://nshipster.com/core-location-in-ios-8/

Answer 2

你需要做两件事：

1. 将CLLocationManager *locationManager 声明为全局变量。因为位置管理器将在范围结束时被释放。因此，一旦范围结束，要显示的授权弹出窗口将隐藏。

2. [locationManager startUpdatingLocation] 应在用户授权状态后立即写入。

   进口

   进口

   @interface ViewController () <CLLocationManagerDelegate>
   
   {
      CLLocationManager *locationManager;
   }
   
   @implementation ViewController
   - (void)viewDidLoad {
       [super viewDidLoad]; 
   
       [MapView setMapType:MKMapTypeStandard];
       [MapView setZoomEnabled:YES];
       [MapView setScrollEnabled:YES];
       [MapView setShowsUserLocation:YES];
       MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } };
       region.center.latitude = 23.0804 ;
       region.center.longitude = 72.5241;
       region.span.longitudeDelta = 0.01f;
       region.span.latitudeDelta = 0.01f;
       [MapView setRegion:region animated:YES];
   
       locationManager = [[CLLocationManager alloc] init];
       locationManager.delegate = self;
       locationManager.distanceFilter = kCLDistanceFilterNone; //whenever we move
       locationManager.desiredAccuracy = kCLLocationAccuracyBest;
   
   
       if ([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])
       {
           [locationManager requestWhenInUseAuthorization];
       }
   
       Display *ann = [[Display alloc] init];
       ann.title = @" Gujarat";
       ann.subtitle = @"High Court";
       ann.coordinate = region.center;
       [MapView addAnnotation:ann];
   }
   
   -(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
           if (status == kCLAuthorizationStatusAuthorizedWhenInUse)
           {
               [locationManager startUpdatingLocation];
           }
           else if (status == kCLAuthorizationStatusDenied)
           {
           //Alert to show for user if any when status is declined
           }
           else
               NSLog(@"Wrong location status");
   }
   

Answer 3

我能在你的 .plist 截图中看到的是

NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription key in Info.plist 

不见了。这是为了在您的应用程序首次启动时显示提示。 添加这些可以解决问题。

Answer 4

实际上有两个 info.plist，我正在更改 Mapview 演示测试 plist 文件中的值。当我在 Info.plist 中添加 NSLocationAlwaysUsageDescription 或 NSLocationWhenInUseUsageDescription 键时它起作用了..