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我正在创建一个标记应用程序，用户可以在其中将街头艺术标记到地图上。我希望用户能够单击图钉 (i) 标注按钮并被带到 Apple Maps。

这个函数应该允许这种情况发生但是我得到一个错误“实例成员'坐标'不能用于类型'艺术'” -

函数 openInMaps() {

    let regionDistance:CLLocationDistance = 1000

    let coordinates = art.coordinate

    let regionSpan = MKCoordinateRegionMakeWithDistance(coordinates!, regionDistance, regionDistance)

    let options = [
        MKLaunchOptionsMapCenterKey: NSValue(mkCoordinate: regionSpan.center),
        MKLaunchOptionsMapSpanKey: NSValue(mkCoordinateSpan: regionSpan.span)
    ]

    let placemark = MKPlacemark(coordinate: coordinates!, addressDictionary: nil)

    let mapItem = MKMapItem(placemark: placemark)

    mapItem.name = art.name

    mapItem.openInMaps(launchOptions: options)



    }

这是我的艺术课——

import Foundation
import FirebaseDatabase
import CoreLocation

class art {

let coordinate: CLLocationCoordinate2D!
var name: String!
var location: String!
var type: String!
var ref: FIRDatabaseReference?


init(snapshot: FIRDataSnapshot) {

    let snapshotValue = snapshot.value as! [String: Any]

    ref = snapshot.ref

    name = snapshotValue["name"] as! String

    location = snapshotValue["location"] as! String

    coordinate = CLLocationCoordinate2D(latitude: snapshotValue["lat"] as! Double, longitude: snapshotValue["lng"] as! Double)

   // type = snapshotValue["type"] as! String

}
}

如果有人指出我正确的方向或告诉我我做错了什么，那就太好了！谢谢。

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