Swift 2/ Xcode 7.2和Swift 1.2 / Xcode 6.3中的MapKit冲突

Question

我正在使用MapKit http://www.raywenderlich.com/90971/introduction-mapkit-swift-tutorial的教程

它是使用Swift 1.2和Xcode 6.3讲授的。然而，在我的项目中，我遇到了一些错误。下面的代码直接来自本教程

我已经在下面标记为(A)和(B)的代码中列出了相关的行。有关错误如下：

(A) ‘缺失参数标签’rawValue‘。在调用中-添加rawValue参数标签没有帮助。

(B)调用中的额外参数“错误”-删除“错误”参数没有帮助

import UIKit
import MapKit

class ViewController: UIViewController {

    @IBOutlet weak var mapView: MKMapView!
    var artworks = [Artwork]()
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let initialLocation = CLLocation(latitude: 21.282778, longitude: -157.829444)
        centerLocationOnMap(initialLocation)

        mapView.delegate = self

        // show artwork on map
        let artwork = Artwork(title: "King David Kalakaua",
            locationName: "Waikiki Gateway Park",
            discipline: "Sculpture",
            coordinate: CLLocationCoordinate2D(latitude: 21.283921, longitude: -157.831661)
        )

        mapView.addAnnotation(artwork)

    }

    let regionRadius: CLLocationDistance = 1000;
    func centerLocationOnMap(location: CLLocation) {
        let regionCoordinates = MKCoordinateRegionMakeWithDistance(location.coordinate, regionRadius * 2.0, regionRadius * 2.0)
        mapView.setRegion(regionCoordinates, animated: true)
    }


func loadInitialData() {

  let fileName = NSBundle.mainBundle().pathForResource("PublicArt", ofType: "json");
  var readError : NSError?

(A)

  var data: NSData = NSData(contentsOfFile: fileName!, options: NSDataReadingOptions(0), error: &readError)!
  var error: NSError?

(B)

let jsonObject: AnyObject! = NSJSONSerialization.JSONObjectWithData(data, 
    options: NSJSONReadingOptions(0), error: &error)

。

  if let jsonObject = jsonObject as? [String: AnyObject] where error == nil,
  let jsonData = JSONValue.fromObject(jsonObject)?["data"]?.array {
    for artworkJSON in jsonData {
      if let artworkJSON = artworkJSON.array,
      // 5
      artwork = Artwork.fromJSON(artworkJSON) {
        artworks.append(artwork)
      }
    }
  }
}

Answer 1

您可以查看NSData和NSJSONSerialization苹果文档中的方法签名更改

在调用函数之前，必须删除错误参数并使用try。

对于选项，您可以将[] ->无选项

try NSData(contentsOfFile: fileName!, options: [])

try NSJSONSerialization.

请参阅Correct handling of NSJSONSerialization (try catch) in Swift (2.0)?

并且您必须使用do { And代码} catch {And}捕获错误，或者只是为了测试目的使用try！