iphone - MKMapViewDelegate + JSON Alamofire

Question

应用程序从我有标签的“moreViewController”上的服务器下载纬度和经度，当我点击图钉时，如何将正确的纬度或经度(以及图像到另一个 View )转换为该标签？

{
  "latitude": 40.9233,
  "longitude": 20.000,
  "image" : "xxxx.xxx/xxx.jpg"
}
{
  "latitude": 50.9233,
  "longitude": 19.320,
  "image" : "xxxx.xxx/yyy.jgp"
}

所以我下载它并保存到全局 var test = [String:AnyObject]()

Alamofire.request("website").responseJSON { response in

     print(response.result)   // result of response serialization
     let json = response.result.val
     print("JSON: \(json)" 
     let jsonTab = json as? Array<Any>
         for item in jsonTab as! [AnyObject] {
          self.test["lat"] = item["lat"] as? Double! as AnyObject?
          self.test["lng"] = item["lng"] as? Double! as AnyObject?
          self.addPin(lat: self.test["lat"] as! Double, lng: self.test["lng"] as! Double)

并添加图钉

func addPin(lat:Double, lng:Double) {
        let testPin = CLLocationCoordinate2D(latitude: lat, longitude: lng)
        let dropPin = MKPointAnnotation()
        dropPin.coordinate = testPin
        dropPin.title = "test"
        mapView.addAnnotation(dropPin)
    }

现在添加右键和segue到下一个 View

func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
        self.performSegue(withIdentifier: "more", sender: self)
    }

    var annotationIdentifier = ""
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        var view = mapView.dequeueReusableAnnotationView(withIdentifier: annotationIdentifier)
        if view == nil {
            view = MKPinAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier)
            view?.canShowCallout = true
            view?.rightCalloutAccessoryView = UIButton(type: .detailDisclosure)
        } else {
            view?.annotation = annotation
        }
        return view
    }

    var selectedAnnotation: MKPointAnnotation!
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        if segue.destination is moreViewController {
            print("123")
            let destViewController:moreViewController = segue.destination as! moreViewController
            destViewController.lat = "\(latTest)"

        }
    }

Answer 1

使用 performSegue 和 sender 而不是传递当前 Controller 引用传递所选 View 的注释。

func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
    self.performSegue(withIdentifier: "more", sender: view.annotation)
}

现在在 prepareForSegue 方法中访问此 sender 属性并从中获取注释。

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if segue.destination is moreViewController {

        let destViewController:moreViewController = segue.destination as! moreViewController
        if let annotation = sender as? MKAnnotation {
            destViewController.lat = "\(annotation.coordinate.latitude)"
            destViewController.long = "\(annotation.coordinate.longitude)"
        }

    }
}

注意:您已经在测试字典中设置了lat和long值，所以它会覆盖该值，它只会包含last数组对象的 lat 和 long 值。