MapKit iOS 9 detailCalloutAccessoryView usage

Question

After watching WWDC video 206 I assumed this would be a trivial task of adding the detail callout view to a mapView annotation view.

So, I assume Im doing something

Answer 1

You have to add some constraints for width and height of your view:

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {
    var av = mapView.dequeueReusableAnnotationViewWithIdentifier("id")
    if av == nil {
        av = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "id")
    }

    let myView = UIView()
    myView.backgroundColor = .greenColor()

    let widthConstraint = NSLayoutConstraint(item: myView, attribute: .Width, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: 40)
    myView.addConstraint(widthConstraint)

    let heightConstraint = NSLayoutConstraint(item: myView, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1, constant: 20)
    myView.addConstraint(heightConstraint)

    av!.detailCalloutAccessoryView = myView
    av!.canShowCallout = true

    return av!
}

Adding an intrinsicContentSize also works.

I did some testing and found out, that MapKit automagically sets translatesAutoresizingMaskIntoConstraints to false, when you set a view to detailCalloutAccessoryView.

In the WWDC 2015 session "What's New in MapKit" it was told, that "auto layout is supported". I reckon that Apple really means, that you have to use auto layout?!