Question

我正在构建一个简单的应用程序，允许用户保存其位置以供以后使用。

目标：用户在某公司营业时固定其地址，我们保存该公司的名称

我的方法：我正在从locationManager请求位置。然后，我将CLLocation反向地理编码为CLPlacemark。由于地标无法识别商户名称，因此我对“附近的餐馆”启动了MKLocalSearch。 response.mapItems将返回完全不同的城市中的位置。

我已经指定了区域，并验证了地标是否正确返回了用户的地址。因此，我认为问题在于MKLocalSearch。

为什么返回不同城市的结果？

已更新：View Controller中的所有代码

class ViewController: UIViewController {

    let locationManager = CLLocationManager()
    var places = [MKMapItem]()

    let naturalLanguageQuery = "closest places to eat"
    let queries = ["restaurants", "places to eat", "breakfast", "lunch", "dinner"]

    override func viewDidLoad() {
        super.viewDidLoad()
        //  Do any additional setup after loading here
        locationManager.delegate = self
        locationManager.desiredAccuracy = kCLLocationAccuracyBest
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        if CLLocationManager.authorizationStatus() == .notDetermined {
            locationManager.requestWhenInUseAuthorization()
        }
    }

    @IBAction func getLocation() {
        if CLLocationManager.authorizationStatus() == .authorizedWhenInUse {
            locationManager.requestLocation()
        }
    }

    func add(placemark: CLPlacemark) {
        search(placemark: placemark, index: self.queries.count - 1)
    }

    func searchCompleted(placemark: CLPlacemark) {
        guard let foo = Scraper.shared.sortByDistance(userPlacemark: placemark, items: places) else { return }
        for item in Scraper.shared.filterForUnique(items: foo) {
            print(item)
            if item.placemark.addressString == placemark.addressString {

            }
        }
    }

    func search(placemark: CLPlacemark, index: Int) {
        let request = MKLocalSearchRequest()
        guard let coordinate = placemark.location?.coordinate else { return }
        request.region = MKCoordinateRegionMakeWithDistance(coordinate, 1600, 1600)
        request.naturalLanguageQuery = queries[index]
        MKLocalSearch(request: request).start { (response, error) in
            guard error == nil else { return }
            guard let response = response else { return }
            guard response.mapItems.count > 0 else { return }

            for item in response.mapItems {
                self.places.append(item)
            }

            if index != 0 {
                self.search(placemark: placemark, index: index - 1)
            } else {
                self.searchCompleted(placemark: placemark)
            }
        }
    }
}

extension ViewController: CLLocationManagerDelegate {
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let geocoder = CLGeocoder()
        if let loc = locations.last {
            geocoder.reverseGeocodeLocation(loc) { (placemarks, error) in
                if let error = error {
                    print("error")
                } else {
                    if let placemark = placemarks?.first {

                        print(placemark.debugDescription)
                        self.add(placemark: placemark)
                    }
                }
            }
        }
    }

    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
        print(error.localizedDescription)
    }
}

Answer 1

给出您的代码，看来您的逻辑是正确的，但是根据位置，您可能无法获得所需的信息。苹果公司MKCoordinateRegion的文档指出：“指定区域并不能保证结果将全部在该区域内。这只是对搜索引擎的提示。” MKLocalSearch Documentation

MKLocalSearch为什么“附近的餐馆”返回不同城市的位置？

1 个答案: