Add StateObjectView

Sources/ObjectUI/View/StateObjectView.swift

@@ -0,0 +1,41 @@
+//
+//  ObjectView.swift
+//  ObjectUI
+//
+//  Created by Leif on 5/24/21.
+//
+
+import SwiftUI
+
+public struct StateObjectView<Content>: View where Content: View {
+    @StateObject private var object: Object = Object()
+    
+    private let content: (Object) -> Content
+    
+    public init(
+        @ViewBuilder content: @escaping (Object) -> Content
+    ) {
+        self.content = content
+    }
+    
+    public var body: some View {
+        content(object)
+    }
+}
+
+struct StateObjectView_Previews: PreviewProvider {
+    static var previews: some View {
+        StateObjectView { object in
+            if let text = object.value(as: String.self) {
+                Text(text)
+            } else {
+                ProgressView()
+                    .onAppear {
+                        DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
+                            object.set(value: "👋")
+                        }
+                    }
+            }
+        }
+    }
+}