feat: Support functional programming

Author: insub4067

README.md

@@ -9,7 +9,16 @@
 #### 🤔 Why do you need SwiftUINavigator when you have a UIHostingController?
 > With UIHostingController, I faced bugs that were hard to predict and could not be resolved. That's why I made SwiftUINavigator to solve those problems.
 
-## ✔️ Example
+## ✔️ Simple Example
+```swift
+SwiftUIView() // return View
+    .asViewController() // return WrapperViewController
+    .title("SwiftUIView") // return UIViewController
+    .backgroundColor(.gray) // return UIViewController
+    .hidesBottomBarWhenPushed(true) // return UIViewController
+```
+
+## ✔️ Project Example
 
 ### UIKit side
 ```swift

Sources/SwiftUINavigator/UIViewController+.swift Sources/SwiftUINavigator/UIViewController+/UIViewController+.swift

@@ -9,20 +9,7 @@
 import UIKit
 
 public extension UIViewController {
-    
-    private struct AssociatedKeys {
-        static var identifier = "Identifier"
-    }
 
-    var identifier: String? {
-        get {
-            objc_getAssociatedObject(self, &AssociatedKeys.identifier) as? String
-        }
-        set {
-            objc_setAssociatedObject(self, &AssociatedKeys.identifier, newValue, .OBJC_ASSOCIATION_RETAIN)
-        }
-    }
-    
     func addChildAndSubView(_ controller: UIViewController) {
         self.addChild(controller)
         controller.view.frame = self.view.frame

Sources/SwiftUINavigator/UIViewController+/UIViewController+functional.swift

@@ -0,0 +1,28 @@
+//
+//  UIViewController+functional.swift
+//
+//
+//  Created by 김인섭 on 10/15/23.
+//
+
+#if canImport(UIKit)
+import UIKit
+
+public extension UIViewController {
+    
+    func title(_ title: String?) -> Self {
+        self.title = title
+        return self
+    }
+    
+    func hidesBottomBarWhenPushed(_ state: Bool) -> Self {
+        self.hidesBottomBarWhenPushed = state
+        return self
+    }
+    
+    func backgroundColor(_ color: UIColor?) -> Self {
+        self.view.backgroundColor = color
+        return self
+    }
+}
+#endif

Sources/SwiftUINavigator/UIViewController+/UIViewController+indentifier.swift

@@ -0,0 +1,26 @@
+//
+//  UIViewController+indentifier.swift
+//
+//
+//  Created by 김인섭 on 10/15/23.
+//
+
+#if canImport(UIKit)
+import UIKit
+
+public extension UIViewController {
+    
+    private struct AssociatedKeys {
+        static var identifier = "Identifier"
+    }
+
+    var identifier: String? {
+        get {
+            objc_getAssociatedObject(self, &AssociatedKeys.identifier) as? String
+        }
+        set {
+            objc_setAssociatedObject(self, &AssociatedKeys.identifier, newValue, .OBJC_ASSOCIATION_RETAIN)
+        }
+    }
+}
+#endif

Sources/SwiftUINavigator/WrapperViewController.swift

@@ -17,8 +17,7 @@ public class WrapperViewController<Content: Wrappable>: UIViewController {
     init(
         content: Content,
         indentifier: String,
-        backgroundColor: UIColor? = nil,
-        hidesBottomBarWhenPushed: Bool = true
+        backgroundColor: UIColor? = nil
     ) {
         self.navigator = Navigator()
         self.content = content
@@ -27,7 +26,6 @@ public class WrapperViewController<Content: Wrappable>: UIViewController {
 
         self.identifier = indentifier
         self.view.backgroundColor = backgroundColor ?? .systemBackground
-        self.hidesBottomBarWhenPushed = hidesBottomBarWhenPushed
 
         setHController()
     }