feature(uiview): Add extension to find parent view controller (#21)

Sources/DSKit/UIKit/UIView/UIView+Parent.swift

@@ -0,0 +1,21 @@
+//
+//  UIView+Parent.swift
+//  DSKit
+//
+//  Created by David Chavez on 13/1/20.
+//
+
+import UIKit
+
+extension UIView {
+    var parentViewController: UIViewController? {
+        var parentResponder: UIResponder? = self
+        while parentResponder != nil {
+            parentResponder = parentResponder?.next
+            if let viewController = parentResponder as? UIViewController {
+                return viewController
+            }
+        }
+        return nil
+    }
+}

Tests/DSKitTests/UIView/UIView+Parent.swift

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+//
+//  UIView+Parent.swift
+//  DSKit
+//
+//  Created by David Chavez on 1/2/24.
+//
+
+import XCTest
+import UIKit
+@testable import DSKit
+
+class ParentViewControllerTests: XCTestCase {
+    func testParentViewControllerSimpleCase() {
+        let parent = UIViewController()
+        let child = UIView()
+        parent.view.addSubview(child)
+
+        XCTAssert(child.parentViewController === parent)
+    }
+
+    func testParentViewControllerNestedCase() {
+        let parent = UIViewController()
+        let child = UIView()
+        let grandChild = UIView()
+
+        parent.view.addSubview(child)
+        child.addSubview(grandChild)
+
+        XCTAssert(grandChild.parentViewController === parent)
+    }
+}