CODEWITHSUNDEEP
iosswiftmapbox
Enrico Torrone
Enrico Torrone

Reputation: 38

How can I change mapbox annotation view?

I've add several annotations with custom annotation view, but I have a reference only to the marker and not to the annotation view itself. So how can I change the annotation view elements?

Upvotes: 2

Views: 803

Answers (2)

Sam
Sam

Reputation: 2331

I added all my annotation views to a dictionary

I created a global dictionary variable

var annotationViews = [CustomAnnotation:CustomAnnotationView]()

Then after creating each annotation view within my delegate function

func mapView(_ mapView: MGLMapView, viewFor annotation: MGLAnnotation) -> MGLAnnotationView?

I added it into my dictionary

 let annotationView = MyAnnotationView(reuseIdentifier: rid, size: CGSize(width: 45, height: 45), annotation: annotation)
 annotationViews[annotation as! MyAnnotation] = annotationView

Later when I wanted to change the text of a text view within my annotation view, I used my annotation in the dictionary call. This returned the annotation view that corresponded to it.

self.annotationViews[anno]?.textView.text = "My new text view status"

No deleting and re-adding required.

You could probably insert something smaller as the key for the dictionary, like annotation.uid or annotation.name or something. I just used the whole annotation object though

Upvotes: 0

Paolo Biglioli
Paolo Biglioli

Reputation: 72

You should store the annotations in a variable and when you want to change their views just remove them from the map with mapView.removeAnnotation(...) and add it back again with mapView.addAnnotation(...).

The method 

func mapView(_ mapView: MGLMapView, viewFor annotation: MGLAnnotation) -> MGLAnnotationView? {
}

will be called and you should return your changed view.

Pay attention to the fact that for performance reasons you should not use addAnnotation() or removeAnnotation() if you have a lot of annotations, but instead addAnnotations() and removeAnnotations()

Upvotes: 4

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