無法使用iOS MapKit獲取用戶位置

Question

使用戶位置正常工作已經使我喪命...

我讀過很多線程，它們解釋了iOS 8的新變化以及如何在info.plist文件中必須有兩個鍵（ NSLocationWhenInUseUsageDescription或NSLocationAlwaysUsageDescription ）中的一個，以便應用程序請求獲得用戶位置的權限。 我做到了

我還加入了我認為是定位服務正常工作所需的所有代碼……但事實並非如此。 請在下面查看我的mapViewController.h和mapViewController.m文件：

mapViewController.h

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <MapKit/MKAnnotation.h>

#define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)

@interface mapViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate>

@property(nonatomic, retain) IBOutlet MKMapView *mapView;
@property(nonatomic, retain) CLLocationManager *locationManager;

@end

mapViewController.m

#import "mapViewController.h"

@interface mapViewController ()

@end

@implementation mapViewController

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

    self.mapView.delegate = self;
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
#ifdef __IPHONE_8_0
    if(IS_OS_8_OR_LATER) {
        // Use one or the other, not both. Depending on what you put in info.plist
        //[self.locationManager requestWhenInUseAuthorization];
        [self.locationManager requestAlwaysAuthorization];
    }
#endif
    [self.locationManager startUpdatingLocation];

    self.mapView.showsUserLocation = YES;
    [self.mapView setMapType:MKMapTypeStandard];
    [self.mapView setZoomEnabled:YES];
    [self.mapView setScrollEnabled:YES];
}

-(void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:YES];

    self.locationManager.distanceFilter = kCLDistanceFilterNone; //Whenever we move
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [self.locationManager startUpdatingLocation];
    NSLog(@"%@", [self deviceLocation]);

    //View Area
    MKCoordinateRegion region = { { 0.0, 0.0 }, { 0.0, 0.0 } };
    region.center.latitude = self.locationManager.location.coordinate.latitude;
    region.center.longitude = self.locationManager.location.coordinate.longitude;
    region.span.longitudeDelta = 0.005f;
    region.span.longitudeDelta = 0.005f;
    [self.mapView setRegion:region animated:YES];

}

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(userLocation.coordinate, 800, 800);
    [self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];
}
- (NSString *)deviceLocation {
    return [NSString stringWithFormat:@"latitude: %f longitude: %f", self.locationManager.location.coordinate.latitude, self.locationManager.location.coordinate.longitude];
}
- (NSString *)deviceLat {
    return [NSString stringWithFormat:@"%f", self.locationManager.location.coordinate.latitude];
}
- (NSString *)deviceLon {
    return [NSString stringWithFormat:@"%f", self.locationManager.location.coordinate.longitude];
}
- (NSString *)deviceAlt {
    return [NSString stringWithFormat:@"%f", self.locationManager.location.altitude];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    // Get the new view controller using [segue destinationViewController].
    // Pass the selected object to the new view controller.
}
*/

@end

此外，如果這是相關的，則將mapViewController綁定到Tab View Controller中的Tab。 當單擊包含包含MKMapView的視圖控制器的選項卡時，我得到以下圖像：

Answer 1

使用此代碼並在設備中運行應用程序以獲取當前位置。 如果您在模擬器中運行，則它將顯示默認位置，即Apple Inc.的地址為當前位置。

- (void)viewDidLoad
{ 
  [super viewDidLoad];
  self.locationManager = [[CLLocationManager alloc] init];
  [self.locationManager setDelegate:self ];
  self.mapView.showsUserLocation=YES;
  [self.locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation: (CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
  [self.mapView setCenterCoordinate:newLocation.coordinate animated:YES];
  MKCoordinateRegion   region=MKCoordinateRegionMakeWithDistance(newLocation.coordinate,70000 ,70000 );
  MKCoordinateRegion adjustedRegion = [self.mapView regionThatFits:region];
  [self.mapView setRegion:adjustedRegion animated:YES];
}

注意：打開設備中的數據或wifi，否則您將遇到位置准確度錯誤。

Answer 2

將以下代碼添加到您的ViewController.h類中，

@interface ViewController : UIViewController<CLLocationManagerDelegate>

@property(nonatomic, retain) CLLocationManager *locationManager;
@end

在ViewController.m類中，

-(void)viewWillAppear:(BOOL)animated{
self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    self.locationManager.distanceFilter = kCLDistanceFilterNone;
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [self.locationManager startUpdatingLocation];
[super viewWillAppear:animated];



}

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

    CLLocationCoordinate2D zoomLocation = CLLocationCoordinate2DMake(newLocation.coordinate.latitude, newLocation.coordinate.longitude);
}

Answer 3

根據文檔， [self.locationManager requestAlwaysAuthorization]是異步的。 實施位置服務auth更改的委托回調，並僅在允許auth狀態之后才開始監視。