地理编码地址不返回正确的坐标

问题描述：

我想从地址字符串获取坐标并将地图标记放置在我的地图视图中，但我没有从地理编码器获取正确的坐标。我看到有几个问题。地理编码地址不返回正确的坐标

一，地图上的注释不是它们应该在的地方，因此不能从我的地理编码器获得正确的坐标。他们应该都相当接近，但他们不是。

二，应该有三个注释，但只有两个出现。难道我做错了什么？

我的完整方法。我的数据库目前有经度和纬度，但我试图避免在那里，如果我能得到这个工作。

func checkDistanceAndAddPins() { 
     for gym in gyms { 
      var index = 0 

      let gymLatitude = gym["latitude"]!!.doubleValue 
      let gymLongitude = gym["longitude"]!!.doubleValue 
      let gymLocation = CLLocation(latitude: gymLatitude, longitude: gymLongitude) 
      let distance = gymLocation.distanceFromLocation(myLocation!) 
      let distanceInMeters = NSNumber(double: distance) 
      let metersDouble = distanceInMeters.doubleValue 
      let miles = metersDouble * 0.00062137 

      if miles > maxDistance { 
       gyms.removeAtIndex(index) 
      } else { 
       // let location = CLLocationCoordinate2D(latitude: gymLatitude, longitude: gymLongitude) 
       gymAnnotation = GymAnnotation() 
       gymAnnotation!.title = gym["name"] as? String 
       gymAnnotation!.subtitle = gym["address"] as? String 

       let addressString = gym["address"] as? String 
       print("Address: \(addressString)") 

       let geocoder = CLGeocoder() 
       geocoder.geocodeAddressString(addressString!, completionHandler: { 
        (placemarks, error) -> Void in 
        if error != nil { 
         print("Error", error) 
        } 
        if let placemark = placemarks?.first { 
         print(placemark.location!.coordinate) 
         self.gymAnnotation!.coordinate = placemark.location!.coordinate 
        } 
       }) 

       // gymAnnotation!.coordinate = location 
       gymAnnotation!.gymPhoneNumber = gym["phone"] as? String 
       gymAnnotation!.gymID = gym["id"] as? String 
       if let website = gym["website"] as? String { 
        gymAnnotation!.gymWebsite = website 
       } 
       gymLocations.append(gymAnnotation!) 
      } 

      index += 1 
     } 

     if self.gymLocations.count == 0 { 
      let messageString = String(format: "There are no gyms within %.0f miles of your current location. Try changing the search radius.", maxDistance) 
      let noGymsAlert = UIAlertController(title: "", message: messageString, preferredStyle: .Alert) 

      let okAction = UIAlertAction(title: "OK", style: .Default, handler: { 
       (action) -> Void in 
       noGymsAlert.dismissViewControllerAnimated(true, completion: nil) 
      }) 

      let radiusAction = UIAlertAction(title: "Change Radius", style: .Default, handler: { 
       (action) -> Void in 
       noGymsAlert.dismissViewControllerAnimated(true, completion: nil) 
       self.changeSearchDistance() 
      }) 

      noGymsAlert.addAction(radiusAction) 
      noGymsAlert.addAction(okAction) 
      noGymsAlert.view.tintColor = BarItems.greenTintColor 

      self.presentViewController(noGymsAlert, animated: true, completion: nil) 
     } 

     for item in gymLocations { 
      print("gymLocations Coordinates: \(item.coordinate)") 
     } 

     dispatch_async(dispatch_get_main_queue()) { 
      self.gymMap.addAnnotations(self.gymLocations) 
      self.gymMap.showAnnotations(self.gymMap.annotations, animated: true) 
      for item in self.gymMap.annotations { 
       print("annotations: \(item.coordinate)") 
      } 
     } 
    }

我打印语句的结果：

Address: Optional("1753 Bardstown Rd, Louisville, KY 40205") 
Address: Optional("8609 Westport Rd, Louisville, KY 40205") 
Address: Optional("Mid City Mall, 1250 Bardstown Rd, Louisville, KY 40204") 
CLLocationCoordinate2D(latitude: 38.235615099999997, longitude: -85.716183599999994) 
CLLocationCoordinate2D(latitude: 38.22886264358975, longitude: -85.70138458380427) 
CLLocationCoordinate2D(latitude: 38.281753100000003, longitude: -85.593839399999993)

添加打印语句打印每个项目的坐标gymLocations：

gymLocations Coordinates: CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0) 
gymLocations Coordinates: CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0) 
gymLocations Coordinates: CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0)

而且添加print语句正确showAnnotations后（）

annotations: CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0) 
annotations: CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0) 
annotations: CLLocationCoordinate2D(latitude: 38.21228, longitude: -85.679669000000004) 
annotations: CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0)

我的猜测是：'geocodeAddressString（）'是异步的。所以举个例子，如果你写了一个日志，例如当你将注释附加到'gymLocations'上时记录，而当你showAnnations（）时你会看到。 – Larme

@Larme看到我的问题的更新。 – raginggoat

问题是：您看到日志出现的顺序是什么？我仍然认为你的问题是关于异步的。 – Larme

答

我通过将for循环中的所有代码移动到地理编码完成处理程序来解决此问题

地理编码地址不返回正确的坐标

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