What is the problem with this code? It is compiling but not running properly.

ViewController.swift


import UIKit
import MapKit

class ViewController: UIViewController {

    @IBOutlet weak var mapView: MKMapView!
    
    let regionRadius: CLLocationDistance = 1000
    let initiallocation = CLLocation(latitude: 34.0522, longitude: 118.2437)
    
    func centerMapOnLocation(location: CLLocation)
    {
        let coordinateRegion = MKCoordinateRegion(center: location.coordinate, latitudinalMeters: regionRadius, longitudinalMeters: regionRadius)
        mapView.setRegion(coordinateRegion, animated: true)
        
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        mapView.delegate = self
        
        centerMapOnLocation(location: initiallocation)
        
        
        
        let place = Place(title: "My House", locationName: "Shyamal's House", coordinate2D: CLLocationCoordinate2D(latitude: 37.3769993, longitude: -94.6895241), article: "Shyamal's Favorite Place to B-Ball", similarPlaces: [])
        
        mapView.addAnnotation(place)
        
        
        
    }

}

extension ViewController: MKMapViewDelegate {
    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
        guard let annotation = annotation as? Place else {return nil}
        let identifier = "marker"
        var view: MKMarkerAnnotationView
        
        if let dequeuedView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier) as Optional {
            dequeuedView.annotation = annotation
            view = dequeuedView as! MKMarkerAnnotationView
        } else {
            view = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: identifier)
            view.canShowCallout = true
            view.calloutOffset = CGPoint(x: -5, y: 3)
            view.rightCalloutAccessoryView = UIButton(type: .detailDisclosure)
        }
        return view
    }
}


Place.swift


import Foundation
import MapKit

class Place: NSObject, MKAnnotation {
    var coordinate: CLLocationCoordinate2D
    
    var title: String?
    var locationName: String?
    var coordinate2D: CLLocationCoordinate2D?
    var article: String?
    var similarPlaces: [CLLocationCoordinate2D]?
    
    init(title: String, locationName: String, coordinate2D: CLLocationCoordinate2D, article: String, similarPlaces: [CLLocationCoordinate2D]) {
        
        self.title = title
        self.locationName = locationName
        self.coordinate2D = coordinate2D
        self.article = article
        self.similarPlaces = similarPlaces
        self.coordinate = coordinate2D
        
        super.init()
        
    }
    /*
    init? (json: [Any]){
        //To be Completed
        super.init()
    }
    */
    
    var subtitle: String? {
        return locationName
    }
}


Output (console) at runtime:


2019-09-25 09:28:05.596379-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [User Defaults] Couldn't write values for keys (
    ApplicationAccessibilityEnabled
) in CFPrefsPlistSource<0x600002c0aa80> (Domain: com.apple.Accessibility, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: Yes): setting preferences outside an application's container requires user-preference-write or file-write-data sandbox access
2019-09-25 09:28:05.598361-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [User Defaults] Couldn't write values for keys (
    AccessibilityEnabled
) in CFPrefsPlistSource<0x600002c0aa80> (Domain: com.apple.Accessibility, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: No): setting preferences outside an application's container requires user-preference-write or file-write-data sandbox access
2019-09-25 09:28:05.598762-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [User Defaults] Couldn't write values for keys (
    FullKeyboardAccessFocusRingEnabled
) in CFPrefsPlistSource<0x600002c0aa80> (Domain: com.apple.Accessibility, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: No): setting preferences outside an application's container requires user-preference-write or file-write-data sandbox access
2019-09-25 09:28:05.602326-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [User Defaults] Couldn't write values for keys (
    ApplicationAccessibilityEnabled
) in CFPrefsPlistSource<0x600002c0aa80> (Domain: com.apple.Accessibility, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: No): setting preferences outside an application's container requires user-preference-write or file-write-data sandbox access
2019-09-25 09:28:05.622810-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXAppAccessibility] AXSettingsLoader told to start
2019-09-25 09:28:05.771522-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXLoading] Accessibility Started
2019-09-25 09:28:05.772208-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXLoading] Accessibility Started (Mini-Server)
2019-09-25 09:28:05.772247-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXLoading] Accessibility Initialize Runtime Overrides
2019-09-25 09:28:05.776147-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXLoading] Accessibility Initialize Subclass Runtime Overrides (UIKit)
2019-09-25 09:28:05.792909-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXAppAccessibility] Started AXRuntime server. SystemApp=0
2019-09-25 09:28:05.837823-0500 Primary Operations - Geography Edition (iOS)[2661:83671] Metal API Validation Enabled
2019-09-25 09:28:06.515178-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MKApplicationStateMonitor] Observer count increased to 1
2019-09-25 09:28:06.515236-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MKApplicationStateMonitor] Will start monitoring using UIApplicationState with initial state (inBackground:YES, active:NO)
2019-09-25 09:28:06.515440-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MKLocationManager] Setting location provider [MKCoreLocationProvider](0x600002920850) for 0x10800aba0
2019-09-25 09:28:06.515471-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MKLocationManager] Shared location manager: 0x10800aba0
2019-09-25 09:28:06.515910-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MKApplicationStateMonitor] Observer count increased to 2
2019-09-25 09:28:06.862886-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MKApplicationStateMonitor] Will exit background
2019-09-25 09:28:06.870600-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MKApplicationStateMonitor] Will become active
2019-09-25 09:28:07.311654-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset compass from edges 12
2019-09-25 09:28:07.311985-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset legal attribution from corner 4
2019-09-25 09:28:07.312214-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset compass from edges 12
2019-09-25 09:28:07.312451-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset legal attribution from corner 4
2019-09-25 09:28:07.312760-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset compass from edges 12
2019-09-25 09:28:07.313020-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset legal attribution from corner 4
2019-09-25 09:28:07.425405-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset compass from edges 12
2019-09-25 09:28:07.425729-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset legal attribution from corner 4
2019-09-25 09:28:07.425930-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset compass from edges 12
2019-09-25 09:28:07.426163-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MapView] Could not inset legal attribution from corner 4
2019-09-25 09:28:07.432164-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXAppAccessibility] Loading settings loader: (system: 0)
2019-09-25 09:28:07.478129-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [UIAutomation] View did appear: <Primary_Operations___Geography_Edition__iOS_.ViewController: 0x10811fbf0> 0
2019-09-25 09:28:07.478394-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXAppAccessibility] AXSettingsLoader told to start
2019-09-25 09:28:07.478464-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXAppAccessibility] AXSettingsLoader told to start
2019-09-25 09:28:07.478521-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXAppAccessibility] AXSettingsLoader told to start
2019-09-25 09:28:09.250869-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [AXLoading] Posted kAXAccessibilityLoaded notification
2019-09-25 09:28:12.622951-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MKApplicationStateMonitor] Will resign active
2019-09-25 09:28:12.623248-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [BackgroundTask] -[UIApplication _beginBackgroundTaskWithName:expirationHandler:]: Will add backgroundTask with taskName: com.apple.asset_manager.cache_resource_cleanup, expirationHandler: <__NSStackBlock__: 0x7ffeefbf9568>
2019-09-25 09:28:12.623289-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [BackgroundTask] _UIBackgroundTaskInfo *_addBackgroundTask(NSString *__strong, void (^__strong)(void)): Created background task <_UIBackgroundTaskInfo: 0x600000cf4c90>: taskID = 0, taskName = com.apple.asset_manager.cache_resource_cleanup, count = 1, assertion = (null). Assertion will be assigned soon
2019-09-25 09:28:12.623338-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [BackgroundTask] _UIBackgroundTaskInfo *_addBackgroundTask(NSString *__strong, void (^__strong)(void))_block_invoke: Creating new assertion since assertion is nil
2019-09-25 09:28:12.623443-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [BackgroundTask] _UIBackgroundTaskInfo *_addBackgroundTask(NSString *__strong, void (^__strong)(void))_block_invoke: Created new assertion <BKSProcessAssertion: 0x600002171720>
2019-09-25 09:28:12.688465-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [BackgroundTask] -[UIApplication _endBackgroundTask:]: Ending background task with UIBackgroundTaskIdentifier: 1
2019-09-25 09:28:12.688562-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [BackgroundTask] -[UIApplication _endBackgroundTask:]: Ending task with identifier 1 and description: <_UIBackgroundTaskInfo: 0x600000cf4c90>: taskID = 1, taskName = com.apple.asset_manager.cache_resource_cleanup, count = 1, assertion = <BKSProcessAssertion: 0x600002171720>, _expireHandler: <__NSMallocBlock__: 0x600000cf4cc0>
2019-09-25 09:28:12.688599-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [BackgroundTask] -[UIApplication _endBackgroundTask:]_block_invoke: Decrementing reference count for assertion used by background task with identifier 1: <_UIBackgroundTaskInfo: 0x600000cf4c90>: taskID = 1, taskName = com.apple.asset_manager.cache_resource_cleanup, count = 1, assertion = (null)
2019-09-25 09:28:12.688625-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [BackgroundTask] -[UIApplication _endBackgroundTask:]_block_invoke: Will invalidate assertion: <BKSProcessAssertion: 0x600002171720> for task identifier: 1
2019-09-25 09:28:12.688849-0500 Primary Operations - Geography Edition (iOS)[2661:83671] [MKApplicationStateMonitor] Will enter background
2019-09-25 09:28:12.971093-0500 Primary Operations - Geography Edition (iOS)[2661:83671] Lifecycle: Task count reached zero, notifying AppKit side.

Replies

I have exactly the same issue ...

Same here. Have you figured out anything?