swift - MKMapItem 创建注释中心

Question

我正在尝试执行MKLocalSearch.Request()并在我的mapView上显示结果，类似于this tutorial但是，当我进行搜索时，返回的坐标偏离了应有的中心位置。如果 map 正确地将布鲁克林显示为行政区中心的叠加层，则注释会远离左侧中心。我注意到 MKMapItem 中包含两组坐标，一组是位置，另一组在打印到控制台时显示为中心。我不确定如何访问中心坐标，但中心坐标是屏幕中间的正确坐标。如何访问中心坐标以用作 MKAnnotation 的坐标？谢谢

搜索代码

let searchRequest = MKLocalSearch.Request()
searchRequest.naturalLanguageQuery = "brooklyn"
searchRequest.region = MKCoordinateRegion(center: CLLocationCoordinate2DMake(40.758896, -73.985130), latitudinalMeters: 2000, longitudinalMeters: 2000)
let search = MKLocalSearch(request: searchRequest)

search.start { (response, error) in
    if let error = error{
        print("Error performing search for location")
    }

    if let response = response{
        for item in response.mapItems{
            print("map item returned: \(item)")

            print("latitude: \(item.placemark.coordinate.latitude) longitude: \(item.placemark.coordinate.longitude)")
            let annotation = MKPointAnnotation()
            annotation.coordinate = item.placemark.coordinate
            annotation.title = item.name
            self.mapView.addAnnotation(annotation)
        }
    }
}

输出

map item returned: Optional(CLCircularRegion (identifier:'<+40.64529796,-73.94483550> radius 14090.15', center:<+40.64529796,-73.94483550>, radius:14090.15m)) latitude: 40.6924599 longitude: -73.9903805

Answer 1

我能够通过从 CLRegion 转换 MKMapItem 的 placemark 属性的 region 属性来访问中心> 到CLCircularRegion。

            if let response = response{
                for item in response.mapItems{
                    print("map item returned: \(item.placemark)")
                    if let region = item.placemark.region as? CLCircularRegion{
                        print("region.center: \(region.center)")
                        let annotation = MKPointAnnotation()
                        annotation.coordinate = region.center
                        annotation.title = item.name
                        self.mapView.addAnnotation(annotation)
                    }

                }