MGLAnnotationView return nil

[iBinh]

Platform: iOS
_Mapbox SDK version:_3.4.0-alpha-2

Steps to trigger behavior

1. Add annotation to mapView with identifier
2. return MGLAnnotationView in -(MGLAnnotationView *)mapView:(MGLMapView *)mapView viewForAnnotation:(CustomAnnotation *)annotation;
3. Retrieve MGLAnnotationView with delegate - (nullable __kindof MGLAnnotationView *)dequeueReusableAnnotationViewWithIdentifier:(NSString *)identifier;
MGLAnnotationView return nil

@1ec5

[1ec5]

Please post your entire implementation of -mapView:viewForAnnotation:. Thanks!

[iBinh]

   MGLAnnotationView *annotationView = [_mapBoxView dequeueReusableAnnotationViewWithIdentifier:annotation.reuseIdentifier];
        if (!annotationView) {
            annotationView = [[MGLAnnotationView alloc] initWithReuseIdentifier:annotation. annotation.reuseIdentifier];
            annotationView.frame = CGRectMake(0, 0, 40, 40);
            CGFloat hue = (CGFloat)annotation.coordinate.longitude / 100;
            annotationView.backgroundColor = [UIColor colorWithHue:hue saturation:0.5 brightness:1 alpha:1];
        }
        return annotationView;

[1ec5]

Is the issue that the call to -dequeueReusableAnnotationViewWithIdentifier: at the top of this implementation returns nil? That’s expected behavior for the first time you dequeue an annotation view with a new reuse identifier. Assuming reuseIdentifier is a custom property you added to your annotation class, make sure the getter returns the value you expect.

[iBinh]

No, I call dequeueReusableAnnotationViewWithIdentifier in another method (in mapView:didUpdateUserLocation ), the annotationView view was created and displayed on mapview, the identifier I dequeue is the same with annotation reuseIdentifier

[1ec5]

-mapView:viewForAnnotation: needs to be called before -mapView:didUpdateUserLocation: in order for that to work. A view is only placed on the reuse queue at the moment -mapView:viewForAnnotation: returns; -mapView:viewForAnnotation: is only called when adding an annotation to the map.

[iBinh]

let me explain my implementation:
I create an annotation and add it in -mapView:didUpdateUserLocation:
if (!customAnnotation) {
// create and add to mapBoxView
}
// dequeue annotation view with dequeueReusableAnnotationViewWithIdentifier
// update position using UIView animation
is it ok?
my purpose is animate annotation view with new coordinate

[1ec5]

If your implementation of -mapView:didUpdateUserLocation: is supposed to obtain the view that MGLMapView is using for the annotation you’ve just added, then you should call -[MGLMapView viewForAnnotation:], passing in the annotation itself, rather than -dequeueReusableAnnotationViewWithIdentifier:. -dequeueReusableAnnotationViewWithIdentifier: is only intended for use in -[MGLMapViewDelegate mapView:viewForAnnotation:].

[iBinh]

Thank you! But the annotationView does not animate, it disappear and then appear again.
Are there any ways to update annotation coordinate, when I move the mapView, the annotationView appear on mapView from it's first location

[1ec5]

This is probably #6203, which is being fixed in #6215.

Closing, since the original reported issue is addressed.