ios - iOS位置问题-看不到任何数据

Question

我是iOS编程的新手，正在尝试获取当前位置。我的主要应用程序代表是这样的，

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

@class AWSViewController;

@interface AWSAppDelegate : UIResponder <UIApplicationDelegate, CLLocationManagerDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) AWSViewController *viewController;
@property (strong, nonatomic) UINavigationController *navController;
@property (strong, nonatomic) NSMutableArray *cities;

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations;

@end

在实现中，我有这两种方法，我从 (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions调用getCurrentLocation

我可以在控制台上看到“开始获取位置”字样，此后什么也看不到。

-(void)getCurrentLocation {

    CLLocationManager *locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
    locationManager.distanceFilter = 500;
    [locationManager startUpdatingLocation];
    NSLog(@"Started to get locations");
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {

    CLLocation *location = [locations lastObject];
    NSLog(@"Got Location");
    NSLog(@"latitude %+.6f, longitude %+.6f\n", location.coordinate.latitude, location.coordinate.longitude);
}

我在这里做错了什么？
谢谢

Answer 1

代码退出getCurrentLocation方法后，您的位置管理器就会超出范围。将位置管理器设置为ivar，以使其保持存在状态。

@interface AWSAppDelegate : UIResponder <UIApplicationDelegate, CLLocationManagerDelegate>
{
    CLLocationManager *locationManager;
}



-(void)getCurrentLocation {
    locationManager = [[CLLocationManager alloc] init];
    // etc
}