✨ Add support for multiple text styles in a single primitive

Sources/AppcuesKit/Data/Models/Experience/ExperienceComponent.swift

@@ -126,6 +126,8 @@ extension ExperienceComponent {
         let id: UUID
         let text: String
 
+        let spans: [TextSpan]?
+
         let style: Style?
 
         var textDescription: String? { text }
@@ -285,6 +287,13 @@ extension ExperienceComponent {
         let width: Double
         let height: Double
     }
+
+    struct TextSpan: Decodable {
+        let text: String
+
+        /// Note: not all style properties can be applied to a `TextSpan`.
+        let style: Style
+    }
 }
 
 extension ExperienceComponent.Style {

Sources/AppcuesKit/Presentation/UI/Components/AppcuesText.swift

@@ -17,10 +17,44 @@ internal struct AppcuesText: View {
     var body: some View {
         let style = AppcuesStyle(from: model.style)
 
-        Text(model.text)
+        Text(textModel: model)
             .applyTextStyle(style, model: model)
             .setupActions(on: viewModel, for: model)
             .applyAllAppcues(style)
             .fixedSize(horizontal: false, vertical: true)
     }
 }
+
+@available(iOS 13.0, *)
+extension Text {
+    init(textModel: ExperienceComponent.TextModel) {
+        if let spans = textModel.spans {
+            self.init("")
+
+            // Note: a ViewBuilder approach here doesn't work because the requirement that we operate strictly on `Text`
+            // and not `some View` for concatenation to work. Therefore we work with the struct directly.
+            spans.forEach { span in
+                let style = AppcuesStyle(from: span.style)
+                var text = Text(span.text)
+
+                if let font = style.font {
+                    text = text.font(font)
+                }
+
+                if let foregroundColor = style.foregroundColor {
+                    text = text.foregroundColor(foregroundColor)
+                }
+
+                if let kerning = style.letterSpacing {
+                    text = text.kerning(kerning)
+                }
+
+                // A shorthand operator with `Text` doesn't compile
+                // swiftlint:disable:next shorthand_operator
+                self = self + text
+            }
+        } else {
+            self.init(textModel.text)
+        }
+    }
+}