如何获取所选地图引脚的坐标数据? [英] How to get coordinate data of selected map pin?

问题描述

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

I am trying get the coordinate of each pin I select on my map. I have an issue that every pin I select it give me the same value.

在副标题中，我可以看到我选择的每个引脚的值，但是当我将其与 Lat 和 Lon 字符串值相等时，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?

In the subtitle I can see the value of each pin I select but when I equal it to Lat and Lon string value it gives me always the same value so Lat and Lon string value won't change. So please where could be my issue?

- (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);
}

我这样做是为了到达地址以获取 AppleMap 应用程序的方向.我需要我选择的引脚的值.

I am doing this to get to the address to get direction to the AppleMap app. I need the values of the pin I selected.

   - (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?

The value of the LAT and LON is always the same. Please where could be my problem?

-(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(速度 -1.00 mps/course -1.00)@ 8/23/13, 10:01:04 AM 标准时间

推荐答案

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

希望能帮到你！！

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