MKMapViewDelegate + JSON ALAMOFIRE

Question

应用程序从"moreViewController"上的服务器下载纬度和经度，我有标签，当我点击固定时，如何将正确的纬度或经度(以及图像转换为另一个视图)到此标签？

{
"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球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)

并添加引脚

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)
}

现在添加右键并转到下一个视图

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与发送方一起传递，而不是传递当前控制器引用传递所选视图的注释。

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

现在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)"
}
}
}

备注：您已在测试字典中设置了lat和long值，因此它将覆盖该值，并且仅包含最后一个数组对象的lat和long值。