This project is an addition to annotation binding enabling value types (such as structs, enums) as MKMapView annotations.
As MKMapView enforces annotations to conform to NSObjectProtocol a developer has pretty much no other choice other than make annotations derive from NSObject in his project. However, these reference types are good to be avoided when dealing with Rx and thus the goal of this project is to make value type binding possible.
You need a custom type and an annotation wrapper for it:
/// A custom type to be bound to the map.
structPointOfInterest:IdentifiableAnnotation{varannotationID=UUID()letcoordinate:CLLocationCoordinate2Dlettitle:String?letsubtitle:String?init(title:String, subtitle:String, coordinate:CLLocationCoordinate2D){self.title = title
self.subtitle = subtitle
self.coordinate = coordinate
}}
/// A subclass of MKAnnotation, to be shown on the map.
classPointOfInterestAnnotation:NSObject,RxAnnotation{@objcvarcoordinate:CLLocationCoordinate2Dvarbox:PointOfInterestvartitle:String?{returnself.box.title
}init(_ annotation:PointOfInterest){self.box = annotation
self.coordinate = annotation.coordinate
}func update(from annotation:PointOfInterest){self.box = annotation
self.coordinate = annotation.coordinate
}}With these two types, you create the binding and you're good to go.
mapView.rx.region
.withLatestFrom(points){($1, $0)}.map{(points, region)in points.filter(region.contains(poi:))}.asDriver(onErrorJustReturn:[]).drive(mapView.rx.items(create:PointOfInterestAnnotation.init)).disposed(by: disposeBag)In order to get get the selection from the map, you need to use selectedItem(ofMappedType:) which gives you the original type.
mapView.rx.didSelectItem(ofMappedType:PointOfInterestAnnotation.self).debug("didSelectItem", trimOutput:true).subscribe().disposed(by: disposeBag)In order to use this extension, RxMKMapView along with RxSwift and RxCocoa are needed. Just copy the file RxMapAnnotations.swift into your project.