通过一个子类和几十个地图引脚将variables传递给一个新的视图控制器

我有一些移动部分，我似乎无法缝合在一起，希望这是非常简单的。

以前的问题不使用子类，在这个例子中，在地图上可能有几十个定制的引脚，每个引脚都将特定的variables传递给一个新的ViewController

三目标：

1. 添加图像到自定义注释（见下面的代码）
2. 我有一个名为Capital的子类，我想在＃1中添加图像，然后创build额外的variables来保存将传递到一个新的SecondViewController ，包括（2）标签和select器视图的值：例如label1 =“text1 “，label2 =”text2“，然后从包含多个对象的数组中获取一个string（即Picker的每一行的标题）
3. 一旦用户点击定制引脚上的标注button，我们将ViewController推送到一个名为SecondViewController的新视图控制器，并将附加到自定义引脚上的子类Capital的值分配给SecondViewController中的新标签和选取器视图

这是我迄今为止的代码：

名为Capital.swift子类

 import MapKit import UIKit class Capital: NSObject, MKAnnotation { var title: String? var coordinate: CLLocationCoordinate2D var info: String // here we would add the custom image in Goal #1 // here we would add the (2) values for label1 and label2 in Goal #2 // here we would add the array that contains multiple object in Goal #2 init(title: String, coordinate: CLLocationCoordinate2D, info: String) { self.title = title self.coordinate = coordinate self.info = info // add additional lines as needed } } 

这是我的ViewController.swift代码

 import MapKit import UIKit class ViewController: UIViewController, MKMapViewDelegate { @IBOutlet var mapView: MKMapView! override func viewDidLoad() { super.viewDidLoad() let london = Capital(title: "London", coordinate: CLLocationCoordinate2D(latitude: 51.507222, longitude: -0.1275), info: "Home to the 2012 Summer Olympics.") let oslo = Capital(title: "Oslo", coordinate: CLLocationCoordinate2D(latitude: 59.95, longitude: 10.75), info: "Founded over a thousand years ago.") let paris = Capital(title: "Paris", coordinate: CLLocationCoordinate2D(latitude: 48.8567, longitude: 2.3508), info: "Often called the City of Light.") let rome = Capital(title: "Rome", coordinate: CLLocationCoordinate2D(latitude: 41.9, longitude: 12.5), info: "Has a whole country inside it.") let washington = Capital(title: "Washington DC", coordinate: CLLocationCoordinate2D(latitude: 38.895111, longitude: -77.036667), info: "Named after George himself.") mapView.addAnnotations([london, oslo, paris, rome, washington]) } func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? { let identifier = "Capital" if annotation is Capital { if let annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier) { annotationView.annotation = annotation return annotationView } else { let annotationView = MKPinAnnotationView(annotation:annotation, reuseIdentifier:identifier) annotationView.isEnabled = true annotationView.canShowCallout = true let btn = UIButton(type: .detailDisclosure) annotationView.rightCalloutAccessoryView = btn //annotationView.image = UIImage(named: "#imageLiteral(resourceName: ",pin,")") return annotationView } } return nil } 

在这里，我们添加特定于被按下的城市的自定义标注variables，并将这些variables推送到SecondViewController

 func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) { let capital = view.annotation as! Capital let placeName = capital.title let placeInfo = capital.info //Add custom image + (2) labels + and the array that contains multiple objects to be passed to the Picker 'view in the SecondViewController // Upon the User tapping the above button we push all the variables stored in Capital attached to the current city pin that was pressed to the new SecondViewController // Send the View Controller to the SecondViewController programically let SecondViewController = self.storyboard?.instantiateViewController(withIdentifier: "SecondViewController") self.show(SecondViewController!, sender: nil) } 

这是我的代码为SecondViewController

 import UIKit class SecondViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource { @IBOutlet weak var pickerView: UIPickerView! var cityName = 0 //the values here are pulled from the custom pin that was pressed in the previous ViewController var Array = ["object1 from custom pin","object2 from custom pin,","object3 from custom pin"] @IBOutlet weak var label1: UILabel! @IBOutlet weak var label2: UILabel! override func viewDidLoad() { super.viewDidLoad() pickerView.delegate = self pickerView.dataSource = self } func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? { return Array[row] } func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int { return Array.count } func numberOfComponents(in pickerView: UIPickerView) -> Int { return 1 } @IBAction func submit(_ sender: Any) { if (cityName == 0){ label1.text = "object1 from custom pin" } else if(cityName == 1){ label1.text = "object2 from custom pin" } else{ label1.text = "object3 from custom pin" // continued... } } func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) { cityName = row } } 

感谢任何帮助

Answer 1

看来你非常接近。 在calloutAccessoryControlTapped ，你得到的地方名称和信息。 我假设这是你想传递给第二个视图控制器，所以在show之前先这样做：

 func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) { let capital = view.annotation as! Capital let placeName = capital.title let placeInfo = capital.info let secondViewController = sUIKeyInputUpArrowtoryboard!.instantiateViewController(withIdentifier: "SecondViewController") // I'm not sure why you're not just doing `storyboard.instantiateViewController(...); do you really have multiple storyboards floating around? secondViewController.placeName = placeName secondViewController.placeInfo = placeInfo show(secondViewController, sender: self) } 

这当然假定你的第二个视图控制器是那些placeName和placeInfo属性，例如

 class SecondViewController { var placeName: String! var placeInfo: String! override func viewDidLoad() { // use placeName and placeInfo to populate UI controls as necessary } } 

不过，我承认，你的问题有很多无关的代码难以理解，所以目前还不清楚你需要做什么。 但是这个想法很明确，那就是calloutAccessoryControlTapped应该

• 找出需要传递给下一个视图控制器的内容;
• 实例化该视图控制器;
• 在下一个视图控制器中设置适当的属性;
• 然后show它; 和
• 第二个视图控制器应该使用你在前面的视图控制器中设置的任何属性来configuration它的UI。

请注意，在第一个视图控制器中calloutAccessoryControlTapped无法直接更新第二个视图控制器中的UI控件（因为该视图控制器的控件尚未连接到故事板中的sockets），而只是传递第二个视图中的任何数据控制器需要。 然后，第二个视图控制器将在其viewDidLoadconfiguration其控件。