Add mapViewModifier + Improve ShapeDataBuilder

Sources/MapLibreSwiftDSL/Data Sources.swift

@@ -46,9 +46,33 @@ public struct ShapeSource: Source {
 
 @resultBuilder
 public enum ShapeDataBuilder {
-    public static func buildBlock(_ components: MLNShape...) -> ShapeData {
-        let features = components.compactMap({ $0 as? MLNShape & MLNFeature })
-
+    // Handle a single MLNShape element
+    public static func buildExpression(_ expression: MLNShape) -> [MLNShape] {
+        return [expression]
+    }
+
+    public static func buildExpression(_ expression: [MLNShape]) -> [MLNShape] {
+        return expression
+    }
+
+    // Combine elements into an array
+    public static func buildBlock(_ components: [MLNShape]...) -> [MLNShape] {
+        return components.flatMap { $0 }
+    }
+
+    // Handle an array of MLNShape (if you want to directly pass arrays)
+    public static func buildArray(_ components: [MLNShape]) -> [MLNShape] {
+        return components
+    }
+
+    // Handle for in of MLNShape
+    public static func buildArray(_ components: [[MLNShape]]) -> [MLNShape] {
+        return components.flatMap { $0 }
+    }
+
+    // Convert the collected MLNShape array to ShapeData
+    public static func buildFinalResult(_ components: [MLNShape]) -> ShapeData {
+        let features = components.compactMap { $0 as? MLNShape & MLNFeature }
         if features.count == components.count {
             return .features(features)
         } else {

Sources/MapLibreSwiftUI/Examples/Other.swift

@@ -0,0 +1,40 @@
+import CoreLocation
+import MapLibre
+import MapLibreSwiftDSL
+import SwiftUI
+
+struct Other_Previews: PreviewProvider {
+    static var previews: some View {
+        let demoTilesURL = URL(string: "https://demotiles.maplibre.org/style.json")!
+
+        // A collection of points with various
+        // attributes
+        let pointSource = ShapeSource(identifier: "points") {
+            // Uses the DSL to quickly construct point features inline
+            MLNPointFeature(coordinate: CLLocationCoordinate2D(latitude: 51.47778, longitude: -0.00139))
+
+            MLNPointFeature(coordinate: CLLocationCoordinate2D(latitude: 0, longitude: 0)) { feature in
+                feature.attributes["icon"] = "missing"
+                feature.attributes["heading"] = 45
+            }
+
+            MLNPointFeature(coordinate: CLLocationCoordinate2D(latitude: 39.02001, longitude: 1.482148)) { feature in
+                feature.attributes["icon"] = "club"
+                feature.attributes["heading"] = 145
+            }
+        }
+
+        MapView(styleURL: demoTilesURL) {
+            // Demonstrates how to use the unsafeMapModifier to set MLNMapView properties that have not been exposed as modifiers yet.
+            SymbolStyleLayer(identifier: "simple-symbols", source: pointSource)
+                .iconImage(constant: UIImage(systemName: "mappin")!)
+        }
+        .unsafeMapViewModifier({ mapView in
+            // Not all properties have modifiers yet. Until they do, you can use this 'escape hatch' to the underlying MLNMapView. Be careful: if you modify properties that the DSL controls already, they may be overridden. This modifier is a "hack", not a final function.
+            mapView.logoView.isHidden = false
+            mapView.compassViewPosition = .topLeft
+        })
+        .ignoresSafeArea(.all)
+        .previewDisplayName("Unsafe MapView Modifier")
+    }
+}

Sources/MapLibreSwiftUI/MapView.swift

@@ -9,6 +9,10 @@ public struct MapView: UIViewRepresentable {
 
     let styleSource: MapStyleSource
     let userLayers: [StyleLayerDefinition]
+
+    /// 'Escape hatch' to MLNMapView until we have more modifiers.
+    /// See ``unsafeMapViewModifier(_:)``
+    private var unsafeMapViewModifier: ((MLNMapView) -> Void)?
 
     public init(
         styleURL: URL,
@@ -28,6 +32,34 @@ public struct MapView: UIViewRepresentable {
     ) {
         self.init(styleURL: styleURL, camera: .constant(initialCamera), makeMapContent)
     }
+
+    /// Allows you to set properties of the underlying MLNMapView directly
+    /// in cases where these have not been ported to DSL yet.
+    /// Use this function to modify various properties of the MLNMapView instance.
+    /// For example, you can enable the display of the user's location on the map by setting `showUserLocation` to true.
+    ///
+    /// This is an 'escape hatch' back to the non-DSL world
+    /// of MapLibre for features that have not been ported to DSL yet.
+    /// Be careful not to use this to modify properties that are
+    /// already ported to the DSL, like the camera for example, as your
+    /// modifications here may break updates that occur with modifiers.
+    ///
+    /// - Parameter modifier: A closure that provides you with an MLNMapView so you can set properties.
+    /// - Returns: A MapView with the modifications applied.
+    ///
+    /// Example:
+    /// ```swift
+    ///  MapView()
+    ///     .mapViewModifier { mapView in
+    ///         mapView.showUserLocation = true
+    ///     }
+    /// ```
+    ///
+    public func unsafeMapViewModifier(_ modifier: @escaping (MLNMapView) -> Void) -> MapView {
+        var newMapView = self
+        newMapView.unsafeMapViewModifier = modifier
+        return newMapView
+    }
 
     public class Coordinator: NSObject, MLNMapViewDelegate {
         var parent:  MapView
@@ -192,11 +224,14 @@ public struct MapView: UIViewRepresentable {
 
     public func updateUIView(_ mapView: MLNMapView, context: Context) {
         context.coordinator.parent = self
+
+        unsafeMapViewModifier?(mapView)
+
         // FIXME: This should be a more selective update
         context.coordinator.updateStyleSource(styleSource, mapView: mapView)
         context.coordinator.updateLayers(mapView: mapView)
 
-        // FIXME: This isn't exactly telling us if the *map* is loaded, and the docs for setCenter say it needs t obe.
+        // FIXME: This isn't exactly telling us if the *map* is loaded, and the docs for setCenter say it needs to be.
         let isStyleLoaded = mapView.style != nil
 
         context.coordinator.updateCamera(mapView: mapView,

Tests/MapLibreSwiftDSLTests/ShapeSourceTests.swift

@@ -35,4 +35,24 @@ final class ShapeSourceTests: XCTestCase {
             XCTFail("Expected a feature source")
         }
     }
+
+    func testForInAndCombinationFeatureBuilder() throws {
+        // ShapeSource now accepts 'for in' building, arrays, and combinations of them
+        let shapeSource = ShapeSource(identifier: "foo") {
+            for coordinates in samplePedestrianWaypoints {
+                MLNPointFeature(coordinate: coordinates)
+            }
+            MLNPointFeature(coordinate: CLLocationCoordinate2D(latitude: 48.2082, longitude: 16.3719))
+        }
+
+        XCTAssertEqual(shapeSource.identifier, "foo")
+
+        switch shapeSource.data {
+        case .features(let features):
+            XCTAssertEqual(features.count, 48)
+        default:
+            XCTFail("Expected a feature source")
+        }
+    }
+
 }