我有一个称为" Capital"的子类,该子类声明变量,我想通过SEGUE将这些变量通过子类推向新的SecondViewController
除了子类" Capital"之外,我还拥有(2)viewController:viewController-> secondViewController
这是我的子类的代码,称为"资本"
import MapKit
import UIKit
class Capital: NSObject, MKAnnotation {
var title: String?
var coordinate: CLLocationCoordinate2D
var info: String
var imageForAnnotationView: UIImage? {
guard let title = title else { return nil }
return UIImage(named: "(title).png")
}
init(title: String, coordinate: CLLocationCoordinate2D, info: String) {
self.title = title
self.coordinate = coordinate
self.info = info
}
}
这是我第一个ViewController的整个代码:
import MapKit
import UIKit
class ViewController: UIViewController, MKMapViewDelegate {
var capital:Capital!
@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"
guard let annotation = annotation as? Capital else { return nil }
let annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier) ?? MKPinAnnotationView(annotation:annotation, reuseIdentifier:identifier)
annotationView.annotation = annotation
annotationView.isEnabled = true
annotationView.canShowCallout = true
annotationView.rightCalloutAccessoryView = UIButton(type: .detailDisclosure)
// set the image to the annotation view
annotationView.image = annotation.imageForAnnotationView
return annotationView
//其他代码
}
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
// let capital = view.annotation as! Capital
// let placeName = capital.title
// let placeInfo = capital.info
self.capital = view.annotation as! Capital
let SecondViewController =
self.storyboard?.instantiateViewController(withIdentifier: "SecondViewController")
self.show(SecondViewController!, sender: nil)
}
}
这是我的secondviewController
的代码import UIKit
class SecondViewController: UIViewController {
@IBOutlet weak var text1: UILabel!
@IBOutlet weak var text2: UILabel!
@IBOutlet weak var text3: UILabel!
var selectedCapital:Capital!
var myString = String()
var placeName = String()
var placeInfo = String()
override func viewDidLoad() {
super.viewDidLoad()
text1.text = myString
text2.text = placeName
text3.text = placeInfo
print(self.selectedCapital)
}}
感谢您的任何帮助
在第一个ViewController中创建一个具有Capital
类型的全局变量。在calloutAccessoryControlTapped
函数中分配VALUE TOT并执行SEGUE中的变量。在SecondViewController中,创建一个具有Capital
类型的全局变量,并在prepare for segue
第一个视图控制器
class ViewController: UIViewController {
var capital:Capital!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let secViewController = segue.destination as! SecondViewController
// push the title, info and other optional variables
secViewController.selectedCapital = self.capital
}
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl) {
self.capital = view.annotation as! Capital
performSegue(withIdentifier: "toSecViewControlle", sender: self)
}
}
第二个ViewController
class SecondViewController: UIViewController {
var selectedCapital:Capital!
override func viewDidLoad() {
super.viewDidLoad()
print(self.selectedCapital)
}
}