获取用户的当前位置iOS 8.0

Question

我试图使用MapKit和CoreLocation获取用户当前位置。 我真的是Objective-C的新手。 就我的研究而言，其实现与旧版iOS到iOS 8.0略有不同。 我正确地遵循了所有内容。 仍然它正在获取当前位置。 我的实际目标是在运行时，当用户在文本字段中给出位置时，在mapKit上获取用户的位置。

filename.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
@interface LocationSelectionViewController : UIViewController <CLLocationManagerDelegate>
@property (weak, nonatomic) IBOutlet UITextField *insertLocation;
@property (strong, nonatomic) IBOutlet MKMapView *serviceLocation;
- (IBAction)next:(id)sender;

@end

#import "LocationSelectionViewController.h"
#import <CoreLocation/CoreLocation.h>

@interface LocationSelectionViewController () <CLLocationManagerDelegate>

@end

@implementation LocationSelectionViewController
CLLocationManager *locationManager;
@synthesize serviceLocation;

- (void)viewDidLoad {
    [super viewDidLoad];
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    [locationManager requestAlwaysAuthorization];
    [locationManager startUpdatingLocation];
    // Do any additional setup after loading the view.
    self.serviceLocation = [[MKMapView alloc] initWithFrame:self.view.bounds];
    self.serviceLocation.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    [self.view addSubview:self.serviceLocation];
    [self.serviceLocation.delegate self];
    //[self.serviceLocation setShowsUserLocation:YES];
}

/*- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation{
    CLLocationCoordinate2D loc=[userLocation coordinate];
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 100, 100);
    [self.serviceLocation setRegion:region animated:YES];
}*/

-(void) locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations{
    [locationManager requestAlwaysAuthorization];
    [locationManager startUpdatingLocation];

}
-(void) locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{
    if(status == kCLAuthorizationStatusAuthorizedAlways || status == kCLAuthorizationStatusAuthorizedWhenInUse){
        self.serviceLocation.showsUserLocation = YES;
    }
}

- (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.
}
*/

- (IBAction)next:(id)sender {
}
@end

如图所示，我根据iOS 8的要求添加了两个属性。

谁能建议我将其存档：

• 获取用户当前位置。
• 在运行时从文本字段获取位置并固定在MapKip上。

Answer 1

您请求和开始位置更新的流程不正确。 首先， requestAlwaysAuthorization不会立即更改授权状态，因为它需要用户按警报中的“ Allow或Don't Allow按钮。 因此，您应该仅在获得结果后才开始位置更新。 然后，在didUpdateLocations无需再次请求/重新启动。

按照以下方式进行

在您的viewDidLoad

 BOOL isAuthorized = [CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedAlways;
 if (isAuthorized) {
     [locationManager startUpdatingLocation];
 }
 else {
     [locationManager requestAlwaysAuthorization];
 }

并实现类似的委托方法

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {
   CLLocation *current = locations.firstObject;
}

- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{
    if(status == kCLAuthorizationStatusAuthorizedAlways || status == kCLAuthorizationStatusAuthorizedWhenInUse){
        self.serviceLocation.showsUserLocation = YES;
       [locationManager startUpdatingLocation];
    }
}

在要请求权限的iOS 8中，您应该在info.plist添加用法描述字符串。 在您的情况下，键为NSLocationAlwaysUsageDescription 。