New SwiftUI Help for MapKit in Xcode 15

At WWDC 2023, Apple introduced higher SwiftUI assist for MapKit. MapKit is a big API, so it’ll be some time earlier than we see a completely native SwiftUI model. But it surely’s undoubtedly getting simpler to show an interactive map view in your app. Essentially the most widely-used function — annotations — will get an enormous enchancment, and the brand new map model modifier requires nearly no work so as to add a ton of pizzazz to your app. Slowly however absolutely, MapKit is buying a extra SwiftUI “contact and really feel”.

On the draw back, should you’ve written a variety of Map code prior to now couple of years, you would possibly have to rewrite a few of it, as Xcode 15 replaces all of the Xcode 12 Map initializers.

Getting Began

Click on Obtain supplies on the high or backside of this text to obtain the starter mission. Open it in Xcode 15 beta to see what you need to work with.

PublicArt

I wrote the primary model of PublicArt in 2014 for my very first raywenderlich.com tutorial MapKit Tutorial: Getting Began. It was an replace of Ray’s unique MapKit tutorial, and Andrew Tetlaw up to date it once more in 2020.

In 2019, I tailored PublicArt for SwiftUI Tutorial: Navigation. Utilizing Xcode 11, I needed to create a struct MapView: UIViewRepresentable to show an MKMapView in a SwiftUI app.

Earlier this 12 months, Josh Steele up to date PublicArt to Xcode 14.2 for our SwiftUI Fundamentals course. That is the starter mission for this text: It makes use of the SwiftUI Map launched in Xcode 12.

For this text, the starter mission has iOS Deployment set to iOS 17.

Xcode 12 Map

Open LocationMap within the code editor. There’s an MKCoordinateRegion @State property. You cross a binding to this into the Map initializer, together with an array of annotationItems, then show a MapMarker utilizing an art work merchandise’s coordinate property. When the Map view seems, you set area.middle and area.span:

@State var area = MKCoordinateRegion()
  ...
Map(coordinateRegion: $area, annotationItems: [artwork]) { art work in
  MapMarker(coordinate: art work.coordinate)
}
.onAppear {
  area.middle = art work.coordinate
  area.span = MKCoordinateSpan(latitudeDelta: 0.02, longitudeDelta: 0.02)
}

Refresh the preview or construct and run the app, and navigate to the map:

Xcode 15 Beta Map

This 12 months’s Map deprecates all of the Xcode 12 initializers. As a substitute of bindings to MKCoordinateRegion or MKMapRect, you create a Map with MapCameraBounds or MapCameraPosition.

You possibly can create a MapCameraBounds worth with an MKCoordinateRegion or MKMapRect worth, plus minimal and most distances, or you possibly can create one utilizing solely minimal and most distances.

Or you possibly can create a Map utilizing no parameters in any respect!

Map & Marker

In LocationMap, remark out @State var area and substitute all of the Map code — Map(...) { ... }.onAppear { ... } — with this:

Map {
  Marker(art work.title, coordinate: art work.coordinate)
}

MapMarker is deprecated, changed by Marker, the place you show a label, which is a View.

You get the identical balloon marker, however the map has zoomed proper in to it. To point out roughly the identical area because the previous area, initialize Map with bounds:

Map(bounds:
      MapCameraBounds(minimumDistance: 4500,
                      maximumDistance: 4500))

Annotation

Along with Marker, there’s a brand new Annotation construction:

Annotation(art work.title,
           coordinate: art work.coordinate) {
  Picture(systemName: "individual.bust")
    .padding(6)
    .foregroundStyle(.white)
    .background(Shade.blue)
}

An Annotation shows each a label View and a content material View, so you possibly can customise your map pins. For instance, add these properties to Paintings:

var image: String {
  swap self-discipline {
  case "Monument", "Sculpture":
    return "individual.bust"
  case "Mural":
    return "paintpalette"
  case "Plaque":
    return "individual.textual content.rectangle"
  default:
    return "mappin"
  }
}

var background: Shade {
  swap self-discipline {
  case "Monument", "Sculpture":
    return .blue
  case "Mural":
    return .mint
  case "Plaque":
    return .orange
  default:
    return .crimson
  }
}

Every art work has a self-discipline property, and these new properties specify symbols and background colours for the most-populated disciplines.

Now, substitute your Marker and Annotation code with:

Marker(art work.title, systemImage: art work.image,
       coordinate: art work.coordinate)
.tint(art work.background)

Annotation(art work.title,
           coordinate: art work.coordinate,
           anchor: .topLeading) {
  Picture(systemName: art work.image)
    .padding(6)
    .foregroundStyle(.white)
    .background(art work.background)
}

Just like the deprecated MapMarker, Marker enables you to specify tint.

To see these customized symbols and colours at work, change the index of the artData merchandise within the preview to 1. This art work is a mural, so that you get mint-colored pins, and the annotation image is a paint palette:

You in all probability wouldn’t need to use each Marker and Annotation for a similar location, however whereas they’re each there, see how one can regulate the place of the annotation’s anchor:

Annotation(art work.title,
           coordinate: art work.coordinate,
           anchor: .topLeading)  // add this argument

The worth of anchor might be high, backside, main, trailing or mixtures, or you possibly can specify a CGPoint with x and y coordinates.

Map Model

And now for top-of-the-line new options: mapStyle. Add this modifier to Map after its closing brace:

.mapStyle(.imagery(elevation: .real looking))

And alter bounds to zoom in:

Map(bounds:
      MapCameraBounds(minimumDistance: 1500,
                      maximumDistance: 1500))

Shift-Possibility-drag to maneuver the map digicam angle:

You too can add an initialPosition parameter to Map to set the map digicam:

Map(
  initialPosition: .digicam(MapCamera(
    centerCoordinate: art work.coordinate,
    distance: 1200,
    heading: 90,
    pitch: 60)),
  bounds:
    MapCameraBounds(minimumDistance: 1500,
                    maximumDistance: 1500)) {

Now, you possibly can take an aerial tour round Honolulu by altering the artData merchandise within the preview. For instance, artData[12]:

There are solely 17 artworks, so don’t transcend artData[16].

The place to Go From Right here?

Obtain the ultimate mission utilizing Obtain supplies on the high or backside of this text.

On this article, you realized about:

• The brand new technique to create a Map.
• The brand new Marker and Annotation buildings.
• The brand new MapStyle construction.
• The brand new MapCamera construction.

Meet MapKit for SwiftUI reveals off a number of nifty options, together with:

• onMapCameraChange(frequency:), an occasion methodology of MapPitchButton.
• MapPolyline and MKRoute.
• MapCompass and MapScaleView.

We hope you loved this tutorial, and if in case you have any questions or feedback, please be a part of the discussion board dialogue beneath!