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The iOS MapRenderer in Xamarin.Forms.Maps now causes an exception due to overriding the delegate. The line is here (in OnelementChanged):
MKMapView mKMapView = (MKMapView)base.Control;
mKMapView.Delegate = new MapDelegate(map2);
mKMapView.RegionChanged += new EventHandler<MKMapViewChangeEventArgs>(this.MkMapViewOnRegionChanged);
The last line overrides the first line. Is this why pin selection was broken?
For reference, this looks like a duplicate of bug 29191. See in particular bug 29191, comment 5.
Should be fixed in 1.4.3