ios - Swift 2 reverseGeocodeLocation 错误

Question

我是 Swift 开发的新手。我刚刚将现有的工作代码转换为 swift2，同时从 6 更新 Xcode 7。

    private func decodeLocation(array: [AnyObject]!, err: NSError!) -> Void {
    if err == nil {
        let mark = array.first as! CLPlacemark
        country = mark.ISOcountryCode
        city = mark.subAdministrativeArea!.stringByReplacingOccurrencesOfString(" ", withString: "", options: NSStringCompareOptions(), range: nil)
        region = mark.administrativeArea
        coordinates = "\(mark.location!.coordinate.latitude),\(mark.location!.coordinate.longitude)"
        print("Country: \(country!)")
        print("City: \(city!)")
        print("Region: \(region!)")
        print("Loc: \(coordinates!)")
        delegate?.didGetLocation("\(coordinates!)")
    }
}
// Delegates
func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
    if status == CLAuthorizationStatus.AuthorizedAlways || status == CLAuthorizationStatus.AuthorizedWhenInUse {
        locationManager.startUpdatingLocation()
    }
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    //An array of CLLocation objects. The most recent location update is at the end of the array.

    dispatch_once(&geoCoderToken, {
        self.currentLocation = locations.last as? CLLocation!
        self.geoCoder.reverseGeocodeLocation(self.currentLocation!, completionHandler: self.decodeLocation)
    })

}

当我构建时，出现此错误。

Cannot convert value of type '([AnyObject]!, err: NSError!) -> Void' to expected argument type 'CLGeocodeCompletionHandler' (aka '(Optional<Array<CLPlacemark>>, Optional<NSError>) -> ()')

如果您有任何想法，请告诉我。谢谢!

Answer 1

我认为您的完成处理程序上的签名不正确

self.decodeLocation

该方法需要如下所示:

func decodeLocation(array:[CLPlacemark]?, error:NSError?) {
...
}

更新:

您的回调函数似乎仍然没有编译器想要的签名。

decodeLocation(array: [AnyObject]!, err: NSError!) -> Void

不等于

```(Optional>, 可选) -> ()

```

这是我上面发布的速记语法的普通版本。

func decodeLocation(array:Array<CLPlacemark>?, error:<NSError>?) {
...
}

如果你在 github 上有一个 Playground 或一个项目，我可以看看我也许可以提供更多帮助。