ios - 在 Swift 迁移后使用未解析的标识符 'enumerate'

Question

我有一个名为 customAnnotationsArray 的数组，我在其中附加了一个类 (Annotations)。此类 Annotations 是 MKAnnotation 和 NSObject 的子类。在我之前的 Swift 版本中，代码 for (index, value) in enumerate(customAnnotationArray) 非常有效地提取了 pin 的索引。现在，它说“使用未解析的标识符‘枚举’。我研究了很多但找不到任何资源。我该如何解决这个问题？

//Annotations array (gets populated with annotations on data load)
var customAnnotationArray = [Annotations]()


//When tapping the MKAnnotationView.
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView,
             calloutAccessoryControlTapped control: UIControl) {

    let theAnnotation = view.annotation

    //ERROR BELOW IN enumerate "Use of unresolved identifier 'enumerate'
    for (index, value) in enumerate(customAnnotationArray) {

        if value === theAnnotation {
            //print("The annotation's array index is \(index)")

            //Im passing these variables in prepareForSegue to VC
            markerIndex = index
            addressSelected = addressArray[index]
        }
    }

    let vc = storyboard.instantiateViewController(withIdentifier: "updateRecordVC")
    self.navigationController!.pushViewController(vc, animated: true)  
}



//Annotations class if that helps.
class Annotations: NSObject, MKAnnotation {
    let title: String?
    let locationName: String
    let coordinate: CLLocationCoordinate2D
    let pinColor: MKPinAnnotationColor

    init(title: String, coordinate: CLLocationCoordinate2D, locationName: String, pinColor:MKPinAnnotationColor) {
        self.title = title
        self.coordinate = coordinate
        self.locationName = locationName
        self.pinColor = pinColor      
        super.init()
    }

    var subtitle: String? {
        return locationName
    }

    func currentPinColor(_ currentUser: Double) -> MKPinAnnotationColor?   {
        switch currentUser {
        case 0:
            return .green
        case 1:
            return .purple
        default:
            return .green
        }
    }
}

Answer 1

尝试使用 enumerated() 方法:

for (index, value) in customAnnotationArray.enumerated()

希望这就是您要找的...