swift - 在 mapView 中搜索特定的注释

Question

在我的项目中，我有一个带有很多注释的 mapView，我想向 map 添加一个搜索功能，这样我就可以搜索这些注释并快速找到我想要的注释。

我按照我在网上找到的教程进行操作，但它在全局范围内搜索 (MKLocalSearch) 而不是注释。

我尝试寻找教程\帮助解决我的问题，但很长一段时间我都得不到任何帮助。 这是我的搜索代码:

我做了这些注释:

let LitzmanLocation = CLLocationCoordinate2DMake(32.100668,34.775192)
        // Drop a pin
        let Litzman = MKPointAnnotation()
        Litzman.coordinate = LitzmanLocation
        Litzman.title = "Litzman Bar"
        Litzman.subtitle = "נמל תל אביב 18,תל אביב"
        mapView.addAnnotation(Litzman)

        let ShalvataLocation = CLLocationCoordinate2DMake(32.101145,34.775163)
        // Drop a pin
        let Shalvata = MKPointAnnotation()
        Shalvata.coordinate = ShalvataLocation
        Shalvata.title = "Shalvata"
        Shalvata.subtitle = "האנגר 28,נמל תל אביב"
        mapView.addAnnotation(Shalvata)


        let MarkidLocation = CLLocationCoordinate2DMake(32.074961,34.781679)
        // Drop a pin
        let Markid = MKPointAnnotation()
        Markid.coordinate = MarkidLocation
        Markid.title = "Markid"
        Markid.subtitle = "אבן גבירול 30,תל אביב"
        mapView.addAnnotation(Markid)

目前我的搜索:

map View Controller :

    //All my Map code is here
    }
    }
    }
    extension MapViewController: HandleMapSearch {
    func dropPinZoomIn(placemark:MKPlacemark){
        // cache the pin
        selectedPin = placemark
        // clear existing pins
        let annotation = MKPointAnnotation()
        annotation.coordinate = placemark.coordinate
        annotation.title = placemark.name
        if let _ = placemark.locality,
            let _ = placemark.administrativeArea {
            annotation.subtitle = ""
        }
        mapView.addAnnotation(annotation)
        let span = MKCoordinateSpanMake(0.01, 0.01)
        let region = MKCoordinateRegionMake(placemark.coordinate, span)
        mapView.setRegion(region, animated: true)
    }  
}

搜索表:

import UIKit
import MapKit

class LocationSearchTable : UITableViewController {

    var matchingItems = [CustomAnnotations]()
    var mapView: MKMapView? = nil

    var handleMapSearchDelegate:HandleMapSearch? = nil

    func parseAddress(selectedItem:MKPlacemark) -> String {
        // put a space between "4" and "Melrose Place"
        let firstSpace = (selectedItem.subThoroughfare != nil && selectedItem.thoroughfare != nil) ? " " : ""
        // put a comma between street and city/state
        let comma = (selectedItem.subThoroughfare != nil || selectedItem.thoroughfare != nil) && (selectedItem.subAdministrativeArea != nil || selectedItem.administrativeArea != nil) ? ", " : ""
        // put a space between "Washington" and "DC"
        let secondSpace = (selectedItem.subAdministrativeArea != nil && selectedItem.administrativeArea != nil) ? " " : ""
        let addressLine = String(
            format:"%@%@%@%@%@%@%@",
            // street number
            selectedItem.subThoroughfare ?? "",
            firstSpace,
            // street name
            selectedItem.thoroughfare ?? "",
            comma,
            // city
            selectedItem.locality ?? "",
            secondSpace,
            // state
            selectedItem.administrativeArea ?? ""
        )
        return addressLine
    }

    func search(keywords:String) {
        self.matchingItems.removeAll()
        for annotation in self.mapView!.annotations {
            if annotation.isKindOfClass(CustomAnnotations) {
                //Just an example here for searching annotation by title, you could add other filtering actions else.
                if (annotation.title??.rangeOfString(keywords) != nil) {
                    self.matchingItems.append(annotation as! CustomAnnotations)
                }
            }
        }
        self.tableView.reloadData()
    }

}

extension LocationSearchTable : UISearchResultsUpdating {
    func updateSearchResultsForSearchController(searchController: UISearchController) {
        guard let mapView = mapView,
            let searchBarText = searchController.searchBar.text else { return }
        let request = MKLocalSearchRequest()
        request.naturalLanguageQuery = searchBarText
        request.region = mapView.region
        let search = MKLocalSearch(request: request)
        search.startWithCompletionHandler { response, _ in
            guard let response = response else {
                return
            }
            self.matchingItems = response.mapItems
            self.tableView.reloadData()
        }
    }

}

extension LocationSearchTable {
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return matchingItems.count
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("MapSearchCell", forIndexPath: indexPath)
        let selectedItem = matchingItems[indexPath.row]
        cell.textLabel?.text = selectedItem.title
        cell.detailTextLabel?.text = selectedItem.subtitle
        return cell
    }

}


extension LocationSearchTable {
    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        let selectedItem = matchingItems[indexPath.row]//.placemark
        handleMapSearchDelegate?.dropPinZoomIn(selectedItem)
        dismissViewControllerAnimated(true, completion: nil)
    }
}

我的问题是如何使用 MKLocalSearch 将其转换为仅搜索我的注释而不是搜索全世界。

我是一名使用 swift 3 和 Xcode 8 的初学者

谢谢你的帮助。

Answer 1

如果您真的不想搜索整个 map ，您应该将 MKLocalSearch 完全排除在外。您可以使用 MKLocalSearchRequest.region 选择给定区域的优先级，但您实际上无法限制搜索。相反，您应该遍历 MKMapView 的 annotations 变量。

extension String {
  func caseInsensitiveSearch(_ string: String) -> Bool {
    if self.lowercased().range(of: string.lowercased()) != nil {
      return true;
    } else {
      return false;
    }
  }    
}

extension MKMapView {
    func searchForCustomAnnotation(like query: String) -> [MyCustomAnnotationClass] {
      let allAnnotations = self.annotations;
      return allAnotations.filter { annotation in
        if let customAnnotation = annotation as? MyCustomAnnotationClass {
          return customAnnotation.title.caseInsensitiveSearch(query);
        }
      }
   }
}

编辑:我刚刚注意到你说你使用的是 Swift 2.3，我的代码是 Swift 3。如果你使用的是 Swift 2.3，你应该将 String.caseInsensitiveSearch 方法更改为:

extension String {
  func caseInsensitiveSearch(_ string: String) -> Bool {
    if self.lowercaseString.rangeOfString(string.lowercaseString) != nil {
      return true;
    } else {
      return false;
    }
  }    
}

然后，您可以在 MKMapView 上使用 searchForCustomAnnotation 来获取标题包含您的搜索查询的所有注释的列表。

您的代码如下所示:

extension LocationSearchTable: UISearchResultsUpdating {
    func updateSearchResultsForSearchController(searchController: UISearchController) {
        guard let mapView = mapView, 
              let searchBarText = searchController.searchBar.text else { return }
            self.matchingItems = mapView.searchForCustomAnnotation(like: searchBarText);
            self.tableView.reloadData()
        }
    }
}