ios - 将图像从 map 注释传递到详细信息 View Controller

Question

我在单独的 swift 文件中有一个名为 Capital 的类。在我的(ViewController)中，我为 map 上的每个图钉声明位置、图像、标题等。当点击 pin 时，会弹出 calloutAccessoryControlTapped 并将我定向到我的 DetailsViewController，我在其中传递了点击的 pin 的标题，但无法传递图像...

    let Headquarters = Capital(title: "Headquarters", coordinate: CLLocationCoordinate2D(latitude: (some latitude), longitude: (some longitude) ), info: "Our headquarters", image: "Location1")  

然后我就可以完美地从 ViewController 到 DetailViewController

      override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showDetails" {

        let theDestination:DetailsViewController = segue.destinationViewController as! DetailsViewController 
        theDestination.toPass = (sender as! MKAnnotationView).annotation!.title! } }

我的类(class)资本

    import MapKit
    import UIKit

class Capital: NSObject, MKAnnotation {

var title: String?
var coordinate: CLLocationCoordinate2D
var info: String
var image: String?


init(title: String, coordinate: CLLocationCoordinate2D, info: String, image: String) {
    self.title = title
    self.coordinate = coordinate
    self.info = info
    self.image = image
}
 }

这就是我在 ViewController 中的方式(声明它们)

    let Headquarters = Capital(title: "Headquarters", coordinate: CLLocationCoordinate2D(latitude: (some coordinate), longitude: (some coordinate)), info: "Our headquarters", image: "Location1")   

还有更多

    mapView.addAnnotations([Headquarters, BlahBlah, OtherStuff])

然后我把它们放进别针

      func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
    let identifier = "Capital"

    if annotation.isKindOfClass(Capital.self) {

        var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier)

        if annotationView == nil {

            annotationView = MKAnnotationView(annotation:annotation, reuseIdentifier:identifier)
            annotationView!.canShowCallout = true
            annotationView!.image = UIImage(named: "pin")


            let btn = UIButton(type: .DetailDisclosure)
            annotationView!.rightCalloutAccessoryView = btn
        } else {

            annotationView!.annotation = annotation

        }

        let cpa = annotation as! Capital
        annotationView!.image = UIImage(named:cpa.image!)

        return annotationView

    }


    return nil
}

然后我尝试将图像传递给DetailsViewController

Answer 1

我不知道您在 prepareForSegue 中将图像传递到哪里，您是否将其加载到详细 View Controller 中？首先我会在detailVC中声明一个变量:

var image: UIImage?

然后我会在你的 ViewController 中传递图像:

   override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showDetails" {

        let theDestination:DetailsViewController = segue.destinationViewController as! DetailsViewController 
        theDestination.toPass = (sender as! MKAnnotationView).annotation!.title! 
        theDestination.image = UIImage(named :"your-image-name")
    } 
}

然后在detailVC的viewDidLoad中，我将变量图像设置为我的IBOutlet ImageView:

override func viewDidLoad(){
    self.imageView.image = self.image
}