Mark method as available for iOS 13 and above

Author: steve509

src/iOSSnapshotTestCase/SwiftSupport.swift

@@ -31,38 +31,38 @@ public extension FBSnapshotTestCase {
     FBSnapshotVerifyViewOrLayer(layer, identifier: identifier, suffixes: suffixes, perPixelTolerance: perPixelTolerance, overallTolerance: overallTolerance, file: file, line: line)
   }
 
+    @available(iOS 13, *)
     func FBSnapshotVerifyViewForLightDarkMode(_ view: UIView, identifier: String? = nil, delay: TimeInterval = 0, perPixelTolerance: CGFloat = 0, overallTolerance: CGFloat = 0, file: StaticString = #file, line: UInt = #line) {
       let viewController = UIViewController()
       viewController.view.addSubview(view)
 
       FBSnapshotVerifyViewControllerForLightDarkMode(viewController, identifier: identifier, delay: delay, perPixelTolerance: perPixelTolerance, overallTolerance: overallTolerance, file: file, line: line)
     }
 
+    @available(iOS 13, *)
     func FBSnapshotVerifyViewControllerForLightDarkMode(_ viewController: UIViewController, identifier: String? = nil, delay: TimeInterval = 0, perPixelTolerance: CGFloat = 0, overallTolerance: CGFloat = 0, file: StaticString = #file, line: UInt = #line) {
-      if #available(iOS 13.0, *) {
-        let navigationController = UINavigationController(rootViewController: viewController)
-        let window = UIWindow()
-        window.rootViewController = navigationController
-        window.makeKeyAndVisible()
+      let navigationController = UINavigationController(rootViewController: viewController)
+      let window = UIWindow()
+      window.rootViewController = navigationController
+      window.makeKeyAndVisible()
 
-        // Take snapshot in light mode
-        navigationController.overrideUserInterfaceStyle = .light
-        RunLoop.main.run(until: Date(timeIntervalSinceNow: delay))
+      // Take snapshot in light mode
+      navigationController.overrideUserInterfaceStyle = .light
+      RunLoop.main.run(until: Date(timeIntervalSinceNow: delay))
 
-        let lightId = [identifier, "light"].compactMap { $0 }.joined(separator: "_")
-        FBSnapshotVerifyView(navigationController.view, identifier: lightId, suffixes: ["Light"], perPixelTolerance: 0, overallTolerance: 0, file: file, line: line)
+      let lightId = [identifier, "light"].compactMap { $0 }.joined(separator: "_")
+      FBSnapshotVerifyView(navigationController.view, identifier: lightId, suffixes: ["Light"], perPixelTolerance: 0, overallTolerance: 0, file: file, line: line)
 
-        // Take snapshot in dark mode
-        window.rootViewController = nil
-        window.rootViewController = navigationController
-        navigationController.overrideUserInterfaceStyle = .dark
-        RunLoop.main.run(until: Date(timeIntervalSinceNow: delay))
+      // Take snapshot in dark mode
+      window.rootViewController = nil
+      window.rootViewController = navigationController
+      navigationController.overrideUserInterfaceStyle = .dark
+      RunLoop.main.run(until: Date(timeIntervalSinceNow: delay))
 
-        let darkId = [identifier, "dark"].compactMap { $0 }.joined(separator: "_")
-        FBSnapshotVerifyView(navigationController.view, identifier: darkId, suffixes: ["Dark"], perPixelTolerance: 0, overallTolerance: 0, file: file, line: line)
+      let darkId = [identifier, "dark"].compactMap { $0 }.joined(separator: "_")
+      FBSnapshotVerifyView(navigationController.view, identifier: darkId, suffixes: ["Dark"], perPixelTolerance: 0, overallTolerance: 0, file: file, line: line)
 
-        window.rootViewController = nil
-      }
+      window.rootViewController = nil
     }
 
   private func FBSnapshotVerifyViewOrLayer(_ viewOrLayer: AnyObject, identifier: String? = nil, suffixes: NSOrderedSet = FBSnapshotTestCaseDefaultSuffixes(), perPixelTolerance: CGFloat = 0, overallTolerance: CGFloat = 0, file: StaticString = #file, line: UInt = #line) {