ios - 基于位置的应用程序，使用带有按钮的滑动汉堡菜单，可过滤 map (iOS MapKit) 搜索结果 Xcode

Question

我正在 Xcode 上使用 MapKit 创建“附近”医院/心理健康中心/调用中心位置应用程序。我希望用户能够过滤 map 的结果。例如，如果我正在寻找医院，我只想看到 map 上显示医院位置。到目前为止，为了做到这一点，我创建了一个滑动汉堡菜单，其中包含类似复选框的按钮以用作过滤器。例如，您点击汉堡菜单按钮，然后选中医院复选框，这样您就只能在 map 上获得医院结果。然而，我一定把它搞砸了，因为当我到达 MapViewController 时，只出现黑屏。请告诉我如何解决这个问题，或者可能使用完全不同的方法来实现相同的目标。

import UIKit
import MapKit

class MapViewController: NSObject, CLLocationManagerDelegate {


@IBOutlet weak var mapView: MKMapView!

@IBOutlet weak var trailingMap: NSLayoutConstraint!

@IBOutlet weak var leadingMap: NSLayoutConstraint!

func viewDidLoad() {
    mapView.delegate = self as? MKMapViewDelegate
    let locationManager = CLLocationManager()
    let regionRadius:CLLocationDistance = 1000
    locationManager.requestWhenInUseAuthorization()
    mapView.showsUserLocation = true
    locationManager.startUpdatingLocation()
}

var hamburgerMenuIsVisible = false

@IBAction func hamburgerMenu(_ sender: Any) {
    if hamburgerMenuIsVisible {
        leadingMap.constant = 150
        trailingMap.constant = -150

        hamburgerMenuIsVisible = true
    } else {
        leadingMap.constant = 0
        trailingMap.constant = 0

        hamburgerMenuIsVisible = false
    }
}


var mapItems: [MKMapItem] = []
var place = MKLocalSearch.Request()              //user's facility search options
var naturalLanguageQuery: String? {
    place.naturalLanguageQuery = "hospital"
    let place2 = MKLocalSearch.Request()
    place2.naturalLanguageQuery = "Mental Health Facility"
    let place3 = MKLocalSearch.Request()
    place3.naturalLanguageQuery = "Women's Center"
    let place4 = MKLocalSearch.Request()
    place4.naturalLanguageQuery = "Call Center"

    place.region = self.mapView.region
    place2.region = self.mapView.region
    place3.region = self.mapView.region
    place4.region = self.mapView.region

    return place.naturalLanguageQuery

} 


@IBAction func hospitalButton(_ sender: Any) {
    print(mapItems)
}


@IBAction func callCenterButton(_ sender: Any) {
    print(mapItems)
}

}

Answer 1

你的ViewController是UIViewController的子类，所以你必须使用UIViewController的继承而不是NSObject

所以，替换这个

class MapViewController: NSObject, CLLocationManagerDelegate {

有了这个

class MapViewController: UIViewController, CLLocationManagerDelegate {

还可以通过在 viewDidLoad 函数的 func 关键字之前添加 override 关键字来修复 viewDidLoad 方法。那是因为您重写了 UIViewController 中的函数。您必须在此函数的开头调用 super.viewDidLoad()。所以 viewDidLoad 应该是这样的

override func viewDidLoad() {

    super.viewDidLoad()

    mapView.delegate = self as? MKMapViewDelegate
    let locationManager = CLLocationManager()
    let regionRadius:CLLocationDistance = 1000
    locationManager.requestWhenInUseAuthorization()
    mapView.showsUserLocation = true
    locationManager.startUpdatingLocation()
}