xcode 如何使用 Swift 更改 MKAnnotation 颜色？
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How to change MKAnnotation Color using Swift?
提问by Zach
I have MKAnnotationsset up on a map, but I would like to change the color of the annotations for different scenario's. Is there a way to change the color of the annotation?
我已经MKAnnotations在地图上进行了设置，但我想更改不同场景的注释颜色。有没有办法改变注释的颜色？
Here is my code below, how would I implement the color change?
下面是我的代码，我将如何实现颜色变化？
override func viewDidAppear(animated: Bool) {
var annotationQuery = PFQuery(className: "Post")
currentLoc = PFGeoPoint(location: MapViewLocationManager.location)
//annotationQuery.whereKey("Location", nearGeoPoint: currentLoc, withinMiles: 10)
annotationQuery.whereKeyExists("Location")
annotationQuery.findObjectsInBackgroundWithBlock {
(points, error) -> Void in
if error == nil {
// The find succeeded.
println("Successful query for annotations")
// Do something with the found objects
let myPosts = points as! [PFObject]
for post in myPosts {
let point = post["Location"] as! PFGeoPoint
let annotation = MKPointAnnotation()
annotation.coordinate = CLLocationCoordinate2DMake(point.latitude, point.longitude)
annotation.title = post["title"] as! String!
annotation.subtitle = post["username"] as! String!
self.mapView.addAnnotation(annotation)
}
} else {
// Log details of the failure
println("Error: \(error)")
}
}
回答by Oleg Shulakov
You can use custom images for annotation view or use predefined MKPinAnnotationViewwith pinColor. But pinColors limited to Red, Green and Purple.
您可以将自定义图像用于注释视图或使用预定义MKPinAnnotationView的pinColor. 但 pinColors 仅限于红色、绿色和紫色。
Some example:
一些例子：
import UIKit
import MapKit
class Annotation: NSObject, MKAnnotation
{
var coordinate: CLLocationCoordinate2D = CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0)
var custom_image: Bool = true
var color: MKPinAnnotationColor = MKPinAnnotationColor.Purple
}
class ViewController: UIViewController, MKMapViewDelegate {
@IBOutlet weak var mapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
self.mapView.delegate = self;
let annotation = Annotation.new()
mapView.addAnnotation(annotation)
let annotation2 = Annotation.new()
annotation2.coordinate = CLLocationCoordinate2D(latitude: 0.0, longitude: 1.0)
annotation2.custom_image = false
mapView.addAnnotation(annotation2)
let annotation3 = Annotation.new()
annotation3.coordinate = CLLocationCoordinate2D(latitude: 1.0, longitude: 0.0)
annotation3.custom_image = false
annotation3.color = MKPinAnnotationColor.Green
mapView.addAnnotation(annotation3)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
if (annotation is MKUserLocation) {
return nil
}
var anView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId)
if anView == nil {
if let anAnnotation = annotation as? Annotation {
if anAnnotation.custom_image {
let reuseId = "custom_image"
anView = MKAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
anView.image = UIImage(named:"custom_image")
}
else {
let reuseId = "pin"
let pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
pinView.pinColor = anAnnotation.color
anView = pinView
}
}
anView.canShowCallout = false
}
else {
anView.annotation = annotation
}
return anView
}
}
Update:Set delegate for mapView in viewDidLoad
更新：在 viewDidLoad 中为 mapView 设置委托
回答by Nerkyator
You have to set it in the viewForAnnotationmethod. In this tutorialis quite well explained how doing it.
您必须在viewForAnnotation方法中设置它。 在本教程中很好地解释了如何做到这一点。
