我設法在Swift中為注解圖釘獲得了一個自定義圖標，但是現在我仍然對2個不同的注解使用不同的圖像?，F在，一個按鈕會向地圖添加注釋。應該有另一個按鈕，該按鈕也添加了注釋，但帶有另一個圖標。有沒有辦法為此使用復用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}
3 回答
鴻蒙傳說
TA貢獻1865條經驗 獲得超7個贊
在viewForAnnotation委托方法中，設置調用該方法所image依據的依據annotation。
一定要做到這一點后視圖被出隊或創建的（而不是只在if anView == nil部分）。否則，使用出隊視圖的注釋將顯示以前使用該視圖的注釋的圖像。
基本而言MKPointAnnotation，一種區分注釋的粗略方法是通過注釋，title但這不是很靈活。
更好的方法是使用實現MKAnnotation協議的自定義注釋類（一種簡便的方法是子類化MKPointAnnotation），并添加所需的任何屬性以幫助實現自定義邏輯。
在自定義類中，添加一個屬性，例如imageName，您可以使用該屬性基于注釋自定義圖像。
此示例子類MKPointAnnotation：
class CustomPointAnnotation: MKPointAnnotation {
var imageName: String!
}
創建類型的注釋CustomPointAnnotation并設置其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"
在中viewForAnnotation，使用imageName屬性設置視圖的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
}
繁花如伊
TA貢獻2012條經驗 獲得超12個贊
借助Anna和Fabian Boulegue的iOS Swift代碼：
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!
}
哆啦的時光機
TA貢獻1779條經驗 獲得超6個贊
需要將注釋向下轉換為CustomPointAnnotation。更改為let pickupCustomAnno = annotation as! CustomPointAnnotation
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