Ios 如何在MKMapView中使用MKLocalSearch

我在MKMapView中使用MKLocalSearch..我实现如下

extension MYClass: SendLocationDelegate{

    func sendCoOrdinates(loccoordinate:CLLocation, placemark:CLPlacemark){

        println(" Google VC coordinate is as \(loccoordinate.coordinate.longitude) \(loccoordinate.coordinate.latitude)")
        let location:CLLocationCoordinate2D = CLLocationCoordinate2D(latitude:loccoordinate.coordinate.latitude, longitude: loccoordinate.coordinate.longitude)
        let theSpan : MKCoordinateSpan = MKCoordinateSpan(latitudeDelta: 0.01, longitudeDelta:0.01)
        let theRegion : MKCoordinateRegion = MKCoordinateRegion(center: location, span: theSpan)
        self.mapView.setRegion(theRegion, animated: false)

        let request = MKLocalSearchRequest()
        request.region = mapView.region
        let search = MKLocalSearch(request: request)

        search.startWithCompletionHandler({(response: MKLocalSearchResponse!,
            error: NSError!) in

            if error != nil {
                println("Error occured in search: \(error.localizedDescription)")

            } else if response.mapItems.count == 0 {

                println("No matches found")

            } else {

                println("Matches found")

                println("\(response)")

            }
        })



    }


}

输出：谷歌VC坐标为72.8561644 19.0176147 搜索时出错：无法完成操作。（MKErrorDomain错误1。）为什么会发生这种情况

已编辑：但是当我将请求更改为

let request = MKLocalSearchRequest()
 request.naturalLanguageQuery = "india"
 //request.region = mapView.region
 let search = MKLocalSearch(request: request)

我得到了很好的回应

{ 边界区域=”； mapItems=( {\n isCurrentLocation=0；\n name=India；\n placemark=\“India，India@ +/-0.00m，区域Cl圆形区域 （标识符：'radius 2237301.34'， 中心：，半径：2237301.34米）\“；\n}” )}

---

一切正常。只是您在请求中犯了一个错误，该请求不包含naturalLanguageQuery

 let request = MKLocalSearchRequest()
 request.region = mapView.region
 let search = MKLocalSearch(request: request)

在本例中，

request.naturalLanguageQuery

将其设置为nil…因此您得到了未知类型的（MKErrorDomain error 1）。查看Apple文档

naturanguagequery

不能包含nil值…因此请使用它发出请求

let request = MKLocalSearchRequest()
 request.naturalLanguageQuery = "india"
 let search = MKLocalSearch(request: request)

您可以使用

region

参数将搜索结果列表缩小到指定区域内或附近的搜索结果。指定区域并不保证所有结果都在该区域内。这只是对搜索引擎的一个提示。因此，

region

可以在这里作为可选项。或者，您也可以提出请求，以获得更好的结果

let request = MKLocalSearchRequest()
request.naturalLanguageQuery = "india"
request.region = mapView.region
let search = MKLocalSearch(request: request)