Add convenience for presentation with navigation controller. Document new parameters (#24)

* Add convenience to navigation controller. Add new parameters to the demo

* Add docs for new customizations

* Invoke `dismissCompletion` when user dismissed bottom sheet by interactive gesture

Author: mikhailmaslo

BottomSheetDemo/Sources/User Interface/Screens/Root/RootViewController.swift

@@ -54,7 +54,14 @@ final class RootViewController: UIViewController {
         let viewController = ResizeViewController(initialHeight: 300)
         presentBottomSheetInsideNavigationController(
             viewController: viewController,
-            configuration: .default
+            configuration: .default,
+            canBeDismissed: {
+                // return `true` or `false` based on your business logic
+                true
+            },
+            dismissCompletion: {
+                // handle dismiss completion if user closed bottom sheet by a gesture
+            }
         )
     }
 }

README.md

@@ -78,7 +78,14 @@ presentBottomSheet(
         cornerRadius: 10,
         pullBarConfiguration: .visible(.init(height: 20)),
         shadowConfiguration: .init(backgroundColor: UIColor.black.withAlphaComponent(0.6))
-    )
+    ),
+    canBeDismissed: {
+        // return `true` or `false` based on your business logic
+        true
+    },
+    dismissCompletion: {
+        // handle dismiss completion if user closed bottom sheet by a gesture
+    }
 )
 ```
 

Sources/BottomSheet/Core/Extensions/UIViewController+Convenience.swift

@@ -69,7 +69,12 @@ public final class DefaultBottomSheetModalDismissalHandler: BottomSheetModalDism
     }
 
     public func performDismissal(animated: Bool) {
-        presentingViewController?.presentedViewController?.dismiss(animated: animated, completion: dismissCompletion)
+        if let presentedViewController = presentingViewController {
+            presentedViewController.dismiss(animated: animated, completion: dismissCompletion)
+        } else {
+            // User dismissed view controller by swipe-gesture, dismiss handler wasn't invoked
+            dismissCompletion?()
+        }
     }
 }
 
@@ -106,8 +111,18 @@ public extension UIViewController {
         present(viewController, animated: true, completion: nil)
     }
 
-    func presentBottomSheetInsideNavigationController(viewController: UIViewController, configuration: BottomSheetConfiguration) {
+    func presentBottomSheetInsideNavigationController(
+        viewController: UIViewController,
+        configuration: BottomSheetConfiguration,
+        canBeDismissed: @escaping (() -> Bool) = { true },
+        dismissCompletion: (() -> Void)? = nil
+    ) {
         let navigationController = BottomSheetNavigationController(rootViewController: viewController, configuration: configuration)
-        presentBottomSheet(viewController: navigationController, configuration: configuration)
+        presentBottomSheet(
+            viewController: navigationController,
+            configuration: configuration,
+            canBeDismissed: canBeDismissed,
+            dismissCompletion: dismissCompletion
+        )
     }
 }