Question

我一直在尝试在我的设备上实现以下代码： -

 #import <UIKit/UIKit.h>
 #import <CoreLocation/CoreLocation.h>
 @interface Whereami1ViewController : UIViewController<CLLocationManagerDelegate>
  {
      CLLocationManager *locationManager;

      __weak IBOutlet UILabel *coordLabel;
  }
 @end

 @implementation Whereami1ViewController

 - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
  {
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self) {
          // Custom initialization
             locationManager = [[CLLocationManager alloc] init];
              [locationManager setDelegate:self];

             [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
             locationManager.distanceFilter= 5.00;//5 meters

             [locationManager startUpdatingLocation];


         }
         return self;
       }

       -(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray  *)locations{//location manager sends this message to self
          NSLog(@"%@",NSStringFromSelector(_cmd));
           NSLog(@"new location–– %@",[locations lastObject]);
           NSLog(@"latitude= %f, longitude= %f",[[locations lastObject] coordinate].latitude, [[locations lastObject] coordinate].longitude);
          CGSize coordData= {[[locations lastObject] coordinate].latitude, [[locations lastObject] coordinate].longitude};

          coordLabel.text= NSStringFromCGSize(coordData);//setting the label's text

       }
       -(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
           NSLog(@"%@",NSStringFromSelector(_cmd));
           NSLog(@"location not found: %@", error);
       }
       @end

在代码中我将距离滤波器设置为5米。这意味着在设备经过5米的移动后，它应该将标签的文本更新为新的坐标(latitude, longitude)。但事实并非如此。我的意思是

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

should get called only when the device has moved more than 5 meters。实际上，设备卡在初始数据中（标签在视图中不会更新）..

我做错了什么..这不是正确的方法吗？

Answer 1

iPod touch使用WiFi网络进行定位服务。因此，可能无法获得5米移动的良好位置或更新？！它的表现与使用GPS信号定位的iPhone或iPda完全不同。

在我的iPod touch上使用Core Location

1 个答案: