迅速不同的图像注释

我设法在Swift中获得了一个注释引脚的自定义图标，但是现在我仍然使用2个不同的图像来注释不同的注释。 现在一个button添加一个注释到地图。 应该有另一个button，也添加注释，但与另一个图标。

有没有办法使用这个重用ID？

class ViewController: UIViewController, MKMapViewDelegate { @IBOutlet weak var Map: MKMapView! @IBAction func btpressed(sender: AnyObject) { var lat:CLLocationDegrees = 40.748708 var long:CLLocationDegrees = -73.985643 var latDelta:CLLocationDegrees = 0.01 var longDelta:CLLocationDegrees = 0.01 var span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta) var location:CLLocationCoordinate2D = CLLocationCoordinate2DMake(lat, long) var region:MKCoordinateRegion = MKCoordinateRegionMake(location, span) Map.setRegion(region, animated: true) var information = MKPointAnnotation() information.coordinate = location information.title = "Test Title!" information.subtitle = "Subtitle" Map.addAnnotation(information) } func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! { if !(annotation is MKPointAnnotation) { return nil } let reuseId = "test" var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) if anView == nil { anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId) anView.image = UIImage(named:"1.png") anView.canShowCallout = true } else { anView.annotation = annotation } return anView } 

Answer 1

在viewForAnnotation委托方法中，根据要调用哪个annotation设置image 。

一定要在视图出列或创build后（而不是只在if anView == nil零部件中）执行此操作。 否则，使用出队视图的注释将显示之前使用视图的注释的图像。

使用基本的MKPointAnnotation ，分离注释的一种粗糙的方法是title但这不是很灵活。

更好的方法是使用实​​现MKAnnotation协议的自定义注释类（一种简单的方法来实现MKPointAnnotation子类），并添加需要的任何属性来帮助实现自定义逻辑。

在自定义类中，添加一个属性，例如imageName ，您可以使用该属性来基于注释自定义图像。

这个例子的子类MKPointAnnotation ：

 class CustomPointAnnotation: MKPointAnnotation { var imageName: String! } 

创buildtypesCustomPointAnnotation注释并设置它们的imageName ：

 var info1 = CustomPointAnnotation() info1.coordinate = CLLocationCoordinate2DMake(42, -84) info1.title = "Info1" info1.subtitle = "Subtitle" info1.imageName = "1.png" var info2 = CustomPointAnnotation() info2.coordinate = CLLocationCoordinate2DMake(32, -95) info2.title = "Info2" info2.subtitle = "Subtitle" info2.imageName = "2.png" 

在viewForAnnotation ，使用imageName属性来设置视图的image ：

 func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! { if !(annotation is CustomPointAnnotation) { return nil } let reuseId = "test" var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) if anView == nil { anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId) anView.canShowCallout = true } else { anView.annotation = annotation } //Set annotation-specific properties **AFTER** //the view is dequeued or created... let cpa = annotation as CustomPointAnnotation anView.image = UIImage(named:cpa.imageName) return anView } 

Answer 2

iOS的Swift代码在Anna和Fabian Boulegue的帮助下：

 import UIKit import MapKit class ViewController: UIViewController, MKMapViewDelegate { @IBOutlet weak var mapView: MKMapView! override func viewDidLoad() { super.viewDidLoad() self.mapView.delegate = self var info1 = CustomPointAnnotation() info1.coordinate = CLLocationCoordinate2DMake(26.889281, 75.836042) info1.title = "Info1" info1.subtitle = "Subtitle" info1.imageName = "flag.png" var info2 = CustomPointAnnotation() info2.coordinate = CLLocationCoordinate2DMake(26.862280, 75.815098) info2.title = "Info2" info2.subtitle = "Subtitle" info2.imageName = "flag.png" mapView.addAnnotation(info1) mapView.addAnnotation(info2) } func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! { println("delegate called") if !(annotation is CustomPointAnnotation) { return nil } let reuseId = "test" var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) if anView == nil { anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId) anView.canShowCallout = true } else { anView.annotation = annotation } //Set annotation-specific properties **AFTER** //the view is dequeued or created... let cpa = annotation as CustomPointAnnotation anView.image = UIImage(named:cpa.imageName) return anView } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } class CustomPointAnnotation: MKPointAnnotation { var imageName: String! }