Swift 2.0 GeoCoder 参数列表

Question

我花了一天时间将项目转换为 Swift 2.0，我对以下代码片段有什么问题感到困惑，该代码片段旨在在地图上显示地址（以字符串格式提供） .

geocoder.geocodeAddressString(addressString, completionHandler: {(placemarks: [AnyObject]!, error: NSError!) -> Void in
    if(error != nil) {

        println("Error", error)
    } else if let placemark = placemarks?[0] as? CLPlacemark {

        var placemark:CLPlacemark = placemarks[0] as! CLPlacemark
        let coordinates:CLLocationCoordinate2D = placemark.location.coordinate
        let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01 , 0.01)
        let region:MKCoordinateRegion = MKCoordinateRegionMake(coordinates, span)

        var pointAnnotation:MKPointAnnotation = MKPointAnnotation()
        pointAnnotation.coordinate = coordinates
        pointAnnotation.title = locationTitle
        pointAnnotation.subtitle = addressString

        map.addAnnotation(pointAnnotation)
        map.centerCoordinate = coordinates
        map.setRegion(region, animated: true)
        map.selectAnnotation(pointAnnotation, animated: true)
    }
})

Answer 1

这更近了。函数签名已更改，println 现在是 print:

geocoder.geocodeAddressString(addressString, completionHandler: {(placemarks: [CLPlacemark]?, error: NSError?) -> Void in
    if (error != nil) {
        print("Error \(error!)")
    } else if let placemark = placemarks?[0] {

        let coordinates:CLLocationCoordinate2D = placemark.location.coordinate
        let span:MKCoordinateSpan = MKCoordinateSpanMake(0.01 , 0.01)
        let region:MKCoordinateRegion = MKCoordinateRegionMake(coordinates, span)

        var pointAnnotation:MKPointAnnotation = MKPointAnnotation()
        pointAnnotation.coordinate = coordinates
        pointAnnotation.title = locationTitle
        pointAnnotation.subtitle = addressString

        map.addAnnotation(pointAnnotation)
        map.centerCoordinate = coordinates
        map.setRegion(region, animated: true)
        map.selectAnnotation(pointAnnotation, animated: true)
    }
})

Swift 2.0 GeoCoder 参数列表

Swift 2.0 GeoCoder argument list

closures

geocoding

swift

swift2