iOS - Fixed setArtboard bug in RiveModel

Fixed bug in RiveModel where using setArtboard(...) was not properly releasing references to old StateMachine and Animation objects.
Updated RiveViewModel's configureModel(...) method to have open access to make ad hoc configuration easier.

Diffs=
ce1c62889 Fixed bug in RiveModel where using setArtboard(...) was not properly releasing references to old StateMachine and Animation objects. Updated RiveViewModel's configureModel(...) method to have open access to make ad hoc configuration easier.

.rive_head

@@ -1 +1 @@
-c1a6b2946685948fefae37ab17d74fcaea6d0d3f
+ce1c62889d15349c96c1eca311f2e2ee9bb4c14d

Source/Components/RiveModel.swift

@@ -28,14 +28,24 @@ open class RiveModel: ObservableObject {
 
     // MARK: - Setters
 
+    /// Sets a new Artboard and makes the current StateMachine and Animation nil
     open func setArtboard(_ name: String) throws {
-        do { artboard = try riveFile.artboard(fromName: name) }
+        do {
+            stateMachine = nil
+            animation = nil
+            artboard = try riveFile.artboard(fromName: name)
+        }
         catch { throw RiveModelError.invalidArtboard("Name \(name) not found") }
     }
 
+    /// Sets a new Artboard and makes the current StateMachine and Animation nil
     open func setArtboard(_ index: Int? = nil) throws {
         if let index = index {
-            do { artboard = try riveFile.artboard(from: index) }
+            do {
+                stateMachine = nil
+                animation = nil
+                artboard = try riveFile.artboard(from: index)
+            }
             catch { throw RiveModelError.invalidArtboard("Index \(index) not found") }
         } else {
             // This tries to find the 'default' Artboard

Source/Components/RiveViewModel.swift

@@ -225,9 +225,12 @@ open class RiveViewModel: NSObject, ObservableObject, RiveFileDelegate, RiveStat
     // MARK: - RiveModel
 
     /// Instantiates elements in the model needed to play in a `RiveView`
-    private func configureModel(artboardName: String? = nil, stateMachineName: String? = nil, animationName: String? = nil) throws {
+    open func configureModel(artboardName: String? = nil, stateMachineName: String? = nil, animationName: String? = nil) throws {
         guard let model = riveModel else { fatalError("Cannot configure nil RiveModel") }
 
+        model.animation = nil
+        model.stateMachine = nil
+
         if let name = artboardName {
             try model.setArtboard(name)
         } else {
@@ -238,9 +241,6 @@ open class RiveViewModel: NSObject, ObservableObject, RiveFileDelegate, RiveStat
             }
         }
 
-        model.animation = nil
-        model.stateMachine = nil
-
         if let name = stateMachineName {
             try model.setStateMachine(name)
         }