類的佈局

Question

我有兩個代碼塊之間的鏈接有問題，這將有望更改註釋圖像。我對swift很陌生，所以我很難在mapView上找到它。我在函數中給出了一個代碼，用於在運行時打印一個字符串，但該字符串未顯示在NSLog中。這是否意味着，該功能根本沒有運行？對於我出錯的地方有任何建議，我將不勝感激。謝謝

class ViewController2: UIViewController { 

@IBOutlet var mapView: MKMapView! 
override func viewDidLoad() { 
super.viewDidLoad() 

//Location for first Pin 
let locationOne = CLLocationCoordinate2DMake(-47.016945, 167.852095) 

//Location for map centering 
let locationNZ = CLLocationCoordinate2DMake(-43.937462, 170.507813) 
let span = MKCoordinateSpanMake(9, 9) 
let region = MKCoordinateRegion(center: locationNZ, span: span) 
mapView.setRegion(region, animated: true) 

//Create annotation one 
let annotation = MKPointAnnotation() 
annotation.coordinate = locationOne 
annotation.subtitle = "Park" 
annotation.title = "Rakiura National Park" 

//Add annotation to the map 
mapView.addAnnotation(annotation)} 

override func didReceiveMemoryWarning() { 
super.didReceiveMemoryWarning()} 




func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? { 

print("func") 
guard !annotation.isKind(of: MKUserLocation.self) else { 
return nil} 

let annotationIdentifier = "AnnotationIdentifier" 

var annotationView: MKAnnotationView? 
if let dequeuedAnnotationView = mapView.dequeueReusableAnnotationView(withIdentifier: annotationIdentifier) { 
annotationView = dequeuedAnnotationView 
annotationView?.annotation = annotation} 
else { 

let av = MKAnnotationView(annotation: annotation, reuseIdentifier: annotationIdentifier) 
av.rightCalloutAccessoryView = UIButton(type: .detailDisclosure) 
annotationView = av} 

if let annotationView = annotationView { 
annotationView.canShowCallout = true 
annotationView.image = UIImage(named: "mapIcon.png")} 

return annotationView}} 

Answer 1

這聽起來像你可能有我忘了設定的委託，所以我委託從來沒有得到所謂的問題;當你的委託方法沒有觸發時，它應該總是你懷疑的。嘗試

mapView.delegate = self