[Refactor] Fix deprecation warnings

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 ## Tempura unreleased
 
+- Remove `UIView.universalSafeAreaInsets` in favor of `UIView.safeAreaInsets`. [#118](https://github.com/BendingSpoons/tempura-swift/pull/118)
 - Make TempuraTesting build on Xcode 12.5 [#111](https://github.com/BendingSpoons/tempura-swift/pull/111)
 - Remove deprecated `dispatch` and `unsafeDispatch` for `NavigationSideEffect` on `AnyStore` and `AnySideEffectContext`. Katana's normal dispatch accepting `Dispatchable`s should be used instead. [#114](https://github.com/BendingSpoons/tempura-swift/pull/114)
 - Remove `__unsafeDispatch` and `__unsafeAwaitDispatch` for `NavigationSideEffect` on `ViewController`. The base methods accepting `Dispatchable`s should be used instead. [#114](https://github.com/BendingSpoons/tempura-swift/pull/114)

Tempura/Sources/Core/View.swift

@@ -165,7 +165,7 @@ import Foundation
 /// }
 /// ```
 
-public protocol View: class {
+public protocol View: AnyObject {
   /// The setup phase should execute only once when the `View` is created,
   /// here you tipically want to create and add all the children views as subviews.
   func setup()

Tempura/Sources/Core/ViewControllerModellableView.swift

@@ -65,51 +65,3 @@ public extension ViewControllerModellableView {
     }
   }
 }
-
-/// Implementation of iOS 11 safeAreaInsets accessible even to older iOS versions.
-/// see also https://developer.apple.com/documentation/uikit/uiview/positioning_content_relative_to_the_safe_area
-public extension UIView {
-  /// Implementation of safeAreaInsets in order to be accessible even to older iOS versions.
-  var universalSafeAreaInsets: UIEdgeInsets {
-    if #available(iOS 11.0, *) {
-      return self.safeAreaInsets
-    } else {
-      return self.legacyIOSSafeAreaInsets
-    }
-  }
-
-  private var legacyIOSSafeAreaInsets: UIEdgeInsets {
-    guard let vc = self.recursiveViewController else {
-      return .zero
-    }
-    let rootView: UIView! = vc.view
-    var top = vc.topLayoutGuide.length
-    var bottom = vc.bottomLayoutGuide.length
-    // the safe area expressed in rootView coordinates
-    let rootViewSafeAreaFrame = CGRect(x: 0, y: top, width: rootView.bounds.width, height: rootView.bounds.height - top - bottom)
-    // convert the rootViewSafeAreaFrame in self coordinates
-    let convertedFrame = rootView.convert(rootViewSafeAreaFrame, to: self)
-    // find the portion of safe area that intersects with self.bounds
-    let intersectionFrame = self.bounds.intersection(convertedFrame)
-    top = intersectionFrame.minY
-    bottom = self.bounds.maxY - intersectionFrame.maxY
-
-    return UIEdgeInsets(
-      top: top,
-      left: 0,
-      bottom: bottom,
-      right: 0
-    )
-  }
-
-  /// Traverse up the hierarchy to find the first UIViewController
-  private var recursiveViewController: UIViewController? {
-    if let modellableView = self as? AnyViewControllerModellableView {
-      return modellableView.viewController
-    }
-    if let parent = self.superview {
-      return parent.recursiveViewController
-    }
-    return nil
-  }
-}

Tempura/Sources/Navigation/Navigator.swift

@@ -527,12 +527,12 @@ extension UIApplication {
 }
 
 /// Defines a way to inspect a UIViewController asking for the next visible UIViewController in the visible stack.
-public protocol CustomRouteInspectables: class {
+public protocol CustomRouteInspectables: AnyObject {
   /// Next view controllers to  be inspected by the router
   var nextRouteControllers: [UIViewController] { get }
 }
 
-public protocol RouteInspectable: class {
+public protocol RouteInspectable: AnyObject {
   /// Next view controller to  be inspected by the router
   var nextRouteController: UIViewController? { get }
 }

Tempura/Sources/Navigation/Routable.swift

@@ -64,7 +64,7 @@ public typealias RoutingCompletion = () -> ()
 ///      }
 ///    }
 /// ```
-public protocol Routable: class {
+public protocol Routable: AnyObject {
   /// The identifier associated to this Routable.
   /// ```swift
   ///    extension TodoListViewController: Routable {