hide navigation bar when web modals are displayed

Sources/ShopifyCheckout/CheckoutBridge.swift

@@ -57,6 +57,7 @@ extension CheckoutBridge {
 		case checkoutComplete
 		case checkoutExpired
 		case checkoutUnavailable
+		case checkoutModalToggled(modalVisible: Bool)
 		case unsupported(String)
 
 		enum CodingKeys: String, CodingKey {
@@ -75,6 +76,9 @@ extension CheckoutBridge {
 			case "error":
 				// needs to support .checkoutUnavailable by parsing error payload on body
 				self = .checkoutExpired
+			case "checkoutBlockingEvent":
+				let modalVisible = try container.decode(String.self, forKey: .body)
+				self = .checkoutModalToggled(modalVisible: Bool(modalVisible)!)
 			default:
 				self = .unsupported(name)
 			}

Sources/ShopifyCheckout/CheckoutView.swift

@@ -30,6 +30,7 @@ protocol CheckoutViewDelegate: AnyObject {
 	func checkoutViewDidFinishNavigation()
 	func checkoutViewDidClickLink(url: URL)
 	func checkoutViewDidFailWithError(error: CheckoutError)
+	func checkoutViewDidToggleModal(modalVisible: Bool)
 }
 
 class CheckoutView: WKWebView {
@@ -104,6 +105,8 @@ extension CheckoutView: WKScriptMessageHandler {
 			case .checkoutUnavailable:
 				CheckoutView.cache = nil
 				viewDelegate?.checkoutViewDidFailWithError(error: .checkoutUnavailable(message: "Checkout unavailable."))
+			case let .checkoutModalToggled(modalVisible):
+				viewDelegate?.checkoutViewDidToggleModal(modalVisible: modalVisible)
 			default:
 				()
 			}

Sources/ShopifyCheckout/CheckoutViewController.swift

@@ -151,4 +151,9 @@ extension CheckoutViewController: CheckoutViewDelegate {
 	func checkoutViewDidClickLink(url: URL) {
 		delegate?.checkoutDidClickLink(url: url)
 	}
+
+	func checkoutViewDidToggleModal(modalVisible: Bool) {
+		guard let navigationController = self.navigationController else { return }
+		navigationController.setNavigationBarHidden(modalVisible, animated: true)
+	}
 }

Tests/ShopifyCheckoutTests/CheckoutBridgeTests.swift

@@ -97,4 +97,19 @@ class CheckoutBridgeTests: XCTestCase {
 			return XCTFail("expected CheckoutScriptMessage.checkoutExpired, got \(result)")
 		}
 	}
+
+	func testDecodeSupportsCheckoutBlockingEvent() throws {
+		let mock = WKScriptMessageMock(body: """
+		{
+			"name": "checkoutBlockingEvent",
+			"body": "true"
+		}
+		""")
+
+		let result = try CheckoutBridge.decode(mock)
+
+		guard case CheckoutBridge.WebEvent.checkoutModalToggled = result else {
+			return XCTFail("expected CheckoutScriptMessage.checkoutModalToggled, got \(result)")
+		}
+	}
 }

Tests/ShopifyCheckoutTests/CheckoutViewControllerTests.swift

@@ -29,13 +29,16 @@ class CheckoutViewDelegateTests: XCTestCase {
 
 	private let checkoutURL = URL(string: "https://checkout-sdk.myshopify.com")!
 	private var viewController: CheckoutViewController!
+	private var navigationController: UINavigationController!
 
 	override func setUp() {
 		ShopifyCheckout.configure {
 			$0.preloading.enabled = true
 		}
 		viewController = CheckoutViewController(
 			checkoutURL: checkoutURL, delegate: ExampleDelegate())
+
+		navigationController = UINavigationController(rootViewController: viewController)
 	}
 
 	func testTitleIsSetToCheckout() {
@@ -97,4 +100,14 @@ class CheckoutViewDelegateTests: XCTestCase {
 		let three = CheckoutView.for(checkout: checkoutURL)
 		XCTAssertEqual(two, three)
 	}
+
+	func testCheckoutViewDidToggleModalAddsAndRemovesNavigationBar() {
+		XCTAssertFalse(viewController.navigationController!.isNavigationBarHidden)
+
+		viewController.checkoutViewDidToggleModal(modalVisible: true)
+		XCTAssertTrue(viewController.navigationController!.isNavigationBarHidden)
+
+		viewController.checkoutViewDidToggleModal(modalVisible: false)
+		XCTAssertFalse(viewController.navigationController!.isNavigationBarHidden)
+	}
 }

Tests/ShopifyCheckoutTests/Mocks/MockCheckoutViewDelegate.swift

@@ -37,6 +37,8 @@ class MockCheckoutViewDelegate: CheckoutViewDelegate {
 
 	var didFailWithErrorExpectation: XCTestExpectation?
 
+	var didToggleModalExpectation: XCTestExpectation?
+
 	func checkoutViewDidStartNavigation() {
 		didStartNavigationExpectation?.fulfill()
 	}
@@ -60,4 +62,8 @@ class MockCheckoutViewDelegate: CheckoutViewDelegate {
     func checkoutViewDidFailWithError(error: CheckoutError) {
 		didFailWithErrorExpectation?.fulfill()
 	}
+
+	func checkoutViewDidToggleModal() {
+		didToggleModalExpectation?.fulfill()
+	}
 }