Swift 3 中未调用 ViewForAnnotation
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【中文标题】Swift 3 中未调用 ViewForAnnotation【英文标题】：ViewForAnnotation not Called in Swift 3 【发布时间】：2016-11-25 04:57:30 【问题描述】：我想在单击 PinAnnotation 时打开一个新的视图控制器。但是当我单击时 ViewForannotation 没有调用，但是当我单击 Pin 时它显示一条弹出消息。不知道发生了什么。这是我的代码：
import UIKit
import MapKit
class Pin: NSObject, MKAnnotation
var coordinate: CLLocationCoordinate2D
var key: String
var title: String?
var age: String?
var category: String?
var color: MKPinAnnotationColor = MKPinAnnotationColor.purple
var subtitle: String?
init(key: String, name: String , age: String , category: String , color: MKPinAnnotationColor)
self.coordinate = CLLocationCoordinate2D(latitude: 0, longitude: 0)
self.key = key
self.title = name
self.color = color
self.subtitle = age
self.category = category
//print("keyy: ", key)
//print("title: ", name)
这是我的 MapViewControllerClass：
import UIKit
import GeoFire
import MapKit
import Firebase
import CoreLocation
class MapViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate, UIAlertViewDelegate
//@IBOutlet weak var sidebarButton: UIBarButtonItem!
@IBOutlet weak var mapView: MKMapView!
//@IBOutlet weak var chatbarButton: UIBarButtonItem!
/* ---> NEW MAP-IT <--- */
let locationManager = CLLocationManager()
let imagePicker = UIImagePickerController()
var regionQuery: GFRegionQuery?
var foundQuery: GFCircleQuery?
var annotations: Dictionary<String, Pin> = Dictionary(minimumCapacity: 8)
var lastExchangeKeyFound: String?
var lastExchangeLocationFound: CLLocation?
var location: CLLocation!
// var location = CLLocation(latitude: 37.33233141, longitude: -122.0312186)
//let location = CLLocation(latitude: 37.33209999, longitude: -122.0326666)
var circle: MKCircle!
var index = 0
var val1Lat: Double!
var val2Lat: Double!
var val1Long: Double!
var val2Long: Double!
var flag = false
var userName = ""
var age = ""
var category = ""
var uid = ""
override func viewDidLoad()
super.viewDidLoad()
uid = DataService.ds.currentUserID
self.mapView.delegate = self
// locationManager.requestAlwaysAuthorization()
if (CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways) || (CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse)
print("Authorized")
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.startUpdatingLocation()
else
print("Application is not authorized to use location services")
//- TODO: Unauthorized, requests permissions again and makes recursive call
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation])
if manager.location?.coordinate != nil
if flag == true
if (location.coordinate.latitude != manager.location?.coordinate.latitude) || (location.coordinate.longitude != manager.location?.coordinate.longitude)
location = manager.location!//.coordinate
print("lat: \(location.coordinate.latitude)")
print("long: \(location.coordinate.longitude)")
animateMap(location: location)
let key = DataService.ds.currentUserID
geofire!.setLocation(location, forKey: key)
else
print("Else:LocationManag")
location = manager.location!
print("lat: \(location.coordinate.latitude)")
print("long: \(location.coordinate.longitude)")
animateMap(location: location)
flag = true
let key = DataService.ds.currentUserID
geofire!.setLocation(location, forKey: key)
override func viewDidAppear(_ animated: Bool)
print("DidAppear")
self.mapView.userLocation.addObserver(self, forKeyPath: "location", options: NSKeyValueObservingOptions(), context: nil)
override func viewDidDisappear(_ animated: Bool)
print("DidDisAppear")
locationManager.stopUpdatingLocation()
self.mapView.userLocation.removeObserver(self, forKeyPath: "location", context: nil)
override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?)
print("In observer")
if (self.mapView.showsUserLocation) && (self.mapView.userLocation.location) != nil
let span = MKCoordinateSpanMake(0.0125, 0.0125)
let region = MKCoordinateRegion(center: self.mapView.userLocation.location!.coordinate /*location.coordinate*/, span: span)
self.mapView.setRegion(region, animated: true)
if foundQuery == nil
print("FoundQuery nill")
foundQuery = geofire?.query(at: /*location*/self.mapView.userLocation.location, withRadius: 0.2)
foundQuery!.observe(GFEventType.keyEntered, with: (key: String?, location:CLLocation?) -> Void in
//print("here")
DataService.ds.userRef.child(key!).observeSingleEvent(of: .value, with: (snapshot) in
if let userDictionary = snapshot.value as? Dictionary<String , AnyObject>
self.userName = userDictionary["firstName"] as! String
self.age = userDictionary["age"] as! String
self.category = userDictionary["category"] as! String
self.lastExchangeKeyFound = key
self.lastExchangeLocationFound = location
if key != DataService.ds.currentUserID
let annotation = Pin(key: key!, name: self.userName , age: self.age , category: self.category , color: MKPinAnnotationColor.green)
annotation.coordinate = (location?.coordinate)!
annotation.title = self.userName + " - " + self.age
annotation.subtitle = self.category
// if self.category == "Trainer"
// annotation.color = MKPinAnnotationColor.green
// else
// annotation.color = MKPinAnnotationColor.purple
//
self.mapView.addAnnotation(annotation)
self.annotations[key!] = annotation
)
self.foundQuery?.observe(.keyExited, with: (key, location) in
if key != DataService.ds.currentUserID
if self.annotations[key!] != nil
self.mapView.removeAnnotation(self.annotations[key!]!)
self.annotations[key!] = nil
)
)
else
foundQuery?.center = self.mapView.userLocation.location
//Click Event For Annotation:
// func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!,
// calloutAccessoryControlTapped control: UIControl!)
//
// if control == view.rightCalloutAccessoryView
// print("Disclosure Pressed! \(view.annotation?.subtitle)")
//
//
//
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView!
print("inPin1")
if annotation is Pin
print("inPin2")
let pinAnnotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "myPin")
pinAnnotationView.pinColor = .purple
pinAnnotationView.isDraggable = true
pinAnnotationView.canShowCallout = true
pinAnnotationView.animatesDrop = true
let deleteButton = UIButton.init(type: UIButtonType.custom) as UIButton
// let deleteButton = UIButton.withType(UIButtonType.custom) as UIButton
deleteButton.frame.size.width = 44
deleteButton.frame.size.height = 44
deleteButton.backgroundColor = UIColor.red
deleteButton.setImage(UIImage(named: "xbutton"), for: .normal)
pinAnnotationView.leftCalloutAccessoryView = deleteButton
return pinAnnotationView
return nil
func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, calloutAccessoryControlTapped control: UIControl!)
if let annotation = view.annotation as? Pin
mapView.removeAnnotation(annotation)
// func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView
// var annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "loc")
// annotationView.canShowCallout = true
// annotationView.rightCalloutAccessoryView = UIButton(type: .detailDisclosure)
// return annotationView
//
//
// func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView)
// mapView.deselectAnnotation(view.annotation, animated: true)
// var controller = self.storyboard!.instantiateViewController(withIdentifier: "DetailsPopover")
// controller.annotation! = view.annotation
// self.popover = UIPopoverController(contentViewController: controller)
// self.popover.delegate = self
// self.popover.presentPopoverFromRect(view.frame, inView: view.superview!, permittedArrowDirections: .Any, animated: true)
//
// func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, calloutAccessoryControlTapped control: UIControl)
// print("helloooo")
// self.performSegue(withIdentifier: "detailView", sender: view)
//
// func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?
// // simple and inefficient example
// let annotationView = MKPinAnnotationView()
// if category == "Trainer"
// annotationView.pinTintColor = .purple
// else
// annotationView.pinTintColor = .green
//
//
//
//
// return annotationView
//
func animateMap(location: CLLocation)
// print("animate Map")
let region = MKCoordinateRegionMakeWithDistance(location.coordinate, 1000, 1000)
mapView.setRegion(region, animated: true)
addRadiusCircle(location: location)
func addRadiusCircle(location: CLLocation)
//print("Add Radius")
//self.mapView.delegate = self
if circle != nil
self.mapView.remove(circle)
circle = MKCircle(center: location.coordinate, radius: 200 as CLLocationDistance)
self.mapView.add(circle)
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer
if overlay is MKCircle
let circle = MKCircleRenderer(overlay: overlay)
circle.strokeColor = UIColor.red
circle.fillColor = UIColor(red: 255, green: 0, blue: 0, alpha: 0.1)
circle.lineWidth = 1
return circle
else
let temp = MKOverlayRenderer()
return temp
我正在使用 Geofire 获取特定半径内的附近用户，然后锁定该用户。请帮忙。
【问题讨论】：
【参考方案1】：你是说：
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView!
那肯定不会被调用。在 Swift 3 中，正确的签名是：
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?
您所要做的就是查阅文档：
https://developer.apple.com/reference/mapkit/mkmapviewdelegate/1452045-mapview
【讨论】：
谢谢马特，我遇到了类似的问题，Xcode Swift 3 转换器似乎错误地将我的 Swift 2 代码转换为func mapView(mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView?
@Eugene 是的，转换器不是 100% 可靠的，可选的协议方法是它可能行为不端的主要地方之一。很大程度上取决于您声明此视图控制器是 MKMapViewDelegate 的确切位置。
非常感谢！这个答案是无价的！ @马特
我怎样才能给你100个赞？惊人的。浪费了 5 个小时。【参考方案2】：
如果其他人在使用正确签名时遇到同样的问题，请确保您已设置 mapView 委托：
override func viewDidLoad()
super.viewDidLoad()
mapView.delegate = self
【讨论】：
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