2

我正在尝试获取我在地图上选择的每个引脚的坐标。我有一个问题,我选择的每个引脚都给我相同的值。

在副标题中,我可以看到我选择的每个引脚的值,但是当我将它等于 Lat 和 Lon 字符串值时,它总是给我相同的值,因此 Lat 和 Lon 字符串值不会改变。那么请问我的问题在哪里?

- (void)viewDidLoad{

  CLLocationCoordinate2D annotationCoord;

  annotationPoint.subtitle = [NSString stringWithFormat:@"%f & %f", annotationPoint.coordinate.latitude, annotationPoint.coordinate.longitude];

  //Lat and Lon are FLOAT.

  Lat = annotationPoint.coordinate.latitude;
  Lon = annotationPoint.coordinate.longitude;


  NSLog(@"Lat is: %f and Lon is: %f", Lat, Lon);
}

我这样做是为了获取地址以获取指向 AppleMap 应用程序的方向。我需要我选择的引脚的值。

   - (MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation
{
MKPinAnnotationView *pinAnnotation = nil;

if(annotation != locationMap.userLocation)
{
    static NSString *defaultPinID = @"myPin";

    pinAnnotation = (MKPinAnnotationView *)[locationMap dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
    if ( pinAnnotation == nil )
        pinAnnotation = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];

    pinAnnotation.canShowCallout = YES;


    //instatiate a detail-disclosure button and set it to appear on right side of annotation
    UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    [infoButton addTarget:self action:@selector(infoButton:) forControlEvents:UIControlEventTouchUpInside];
    pinAnnotation.rightCalloutAccessoryView = infoButton;
}
return pinAnnotation;
}

LAT 和 LON 的值始终相同。请问我的问题在哪里?

-(void)infoButton:(id)sender{

NSString *str = [NSString stringWithFormat:@"http://maps.apple.com/maps?saddr=%f,%f&daddr=%f,%f", Lat,Lon,lat1,lon1];

NSLog(@"Test %f, %f", Lat, Lon);


NSURL *URL = [NSURL URLWithString:str];

[[UIApplication sharedApplication] openURL:URL];
}

测试解决方案:

-(void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control{

MKPointAnnotation *annotationPoint = [[MKPointAnnotation alloc] init];

CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:annotationPoint.coordinate.latitude longitude:annotationPoint.coordinate.longitude];

NSLog(@"RESULT: Lat:%@ Long:%@", [[view annotation]coordinate].latitude,[[view annotation]coordinate].longitude);
}

NSLog 结果:LAST: <+0.00000000,+0.00000000> +/- 0.00m (speed -1.00 mps / course -1.00) @ 8/23/13, 10:01:04 AM Standard Time

4

2 回答 2

3

试试这行代码:

CLLocation *pinLocation = [[CLLocation alloc] initWithLatitude:[(MyAnnotation*)[view annotation] coordinate].latitude longitude:[(MyAnnotation*)[view annotation] coordinate].longitude];

在方法中:

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view 
calloutAccessoryControlTapped:(UIControl *)control

希望能帮助到你!!

于 2013-08-22T12:43:43.047 回答
1

每次按下公开按钮时,您都会打印出and 的值LatLon使用 and 的值lat1lon1但您只能将它们更改为viewDidLoad. 因此,一旦页面加载完毕,无论您按下哪个引脚,您总是会打印出相同的值。

您应该实现正常的委托功能,而不是为您的按钮分配目标- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control。在那里,您可以使用view'annotation属性并获取coordinate其中包含您想要的信息的属性。

于 2013-08-22T22:57:40.747 回答