获取用户当前位置的iOS 8.0

Question

我试图让用户在使用MapKit和CoreLocation当前位置。我对Objective-C非常陌生。至于我的研究，实现与旧版iOS到iOS 8.0稍有不同。我一切正确。它仍然在获取当前位置。我的实际目标是在用户在文本字段中提供位置时，在运行时获取pinkit用户位置。

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 

由于在图像中我已经添加了两个属性，按照iOS 8的要求。

谁能告诉我在这个归档：

• 让用户的当前位置。
• 在运行时从文本字段获取位置并锁定在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，因为它需要用户按下警报中的Allow或Don't Allow按钮。所以你只有在得到结果后才能开始位置更新。然后在didUpdateLocations不需要再次请求/重新启动。

做在下面的方式，

DN您viewDidLoad

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

而且实现委托方法，如

- (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iOS系统中8请求允许，你应该添加使用描述字符串在info.plist。在你的情况下，关键是NSLocationAlwaysUsageDescription。