MKAnnotationView is not getting displayed in iOS 11

Question

I am having an application running on app store, which has map view with other functionality.

Everything works perfectly till iOS 10 (all versions except iOS 11), now when I tested same app on iOS 11, then MKAnnotationView is not getting displayed (This happens only with iOS 11).

There is no any exception/error shown. I went thought apple documentation, but there is no any such deprecation in API's, but still its not working.

Can someone please help me out in this issue.

Answer 1

I was able to get it to display by calling "prepareForDisplay" on the annotation view within the viewForAnnotation delegate method. prepareForDisplay is a new method in iOS 11, but it is not documented.

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {

    // Current Location Annotation
    if ([annotation isKindOfClass:[MKUserLocation class]]) {
        return nil;
    }

    // Custom Annotation
    if ([annotation isKindOfClass:[CustomAnnotationView class]]) {
        CustomAnnotationView *view = (CustomAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"Custom"];
        if (!view) {
            view = [[CustomAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Custom"];
        } else {
            view.annotation = annotation;
        }

        if (@available(iOS 11.0, *)) {
            [view prepareForDisplay];
        }

        return view;
    }

    return nil;
}

I'm still trying to figure out if this is a bug or proper use. Stay tuned!