BackGesture helper

ACKategories.xcodeproj/project.pbxproj

@@ -99,6 +99,7 @@
 		69FA5FBC23C868A900B44BCD /* AppFlowCoordinator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69FA5FAB23C868A900B44BCD /* AppFlowCoordinator.swift */; };
 		69FA5FBD23C868A900B44BCD /* ModalFlowCoordinator.swift in Sources */ = {isa = PBXBuildFile; fileRef = 69FA5FAC23C868A900B44BCD /* ModalFlowCoordinator.swift */; };
 		69FA5FC223C8690A00B44BCD /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 69FA5FC123C8690A00B44BCD /* LaunchScreen.storyboard */; };
+		6A72B2222B1A15AC00A59EDD /* BackGesture.swift in Sources */ = {isa = PBXBuildFile; fileRef = 6A72B2212B1A15AC00A59EDD /* BackGesture.swift */; };
 		88EDD90425B8252E00207987 /* GradientViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88EDD90325B8252E00207987 /* GradientViewController.swift */; };
 /* End PBXBuildFile section */
 
@@ -244,6 +245,7 @@
 		69FA5FAB23C868A900B44BCD /* AppFlowCoordinator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = AppFlowCoordinator.swift; sourceTree = "<group>"; };
 		69FA5FAC23C868A900B44BCD /* ModalFlowCoordinator.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ModalFlowCoordinator.swift; sourceTree = "<group>"; };
 		69FA5FC123C8690A00B44BCD /* LaunchScreen.storyboard */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = file.storyboard; path = LaunchScreen.storyboard; sourceTree = "<group>"; };
+		6A72B2212B1A15AC00A59EDD /* BackGesture.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BackGesture.swift; sourceTree = "<group>"; };
 		88EDD90325B8252E00207987 /* GradientViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = GradientViewController.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
@@ -370,6 +372,7 @@
 				69E0A5F62AFD10BE00C8E8D9 /* PropertyWrappers */,
 				69E0A5FE2AFD10BE00C8E8D9 /* RandomExtensions */,
 				69E0A6032AFD10BE00C8E8D9 /* SwiftUIExtensions */,
+				6A72B2212B1A15AC00A59EDD /* BackGesture.swift */,
 			);
 			path = ACKategories;
 			sourceTree = "<group>";
@@ -847,6 +850,7 @@
 				69ACD6F72AFD133A0021127B /* UIStackViewExtensions.swift in Sources */,
 				69ACD6F82AFD133A0021127B /* UIView+Spacer.swift in Sources */,
 				69ACD6F92AFD133A0021127B /* UIViewController+Children.swift in Sources */,
+				6A72B2222B1A15AC00A59EDD /* BackGesture.swift in Sources */,
 				69ACD6FA2AFD133A0021127B /* UIViewController+FrontMost.swift in Sources */,
 				69ACD6FB2AFD133A0021127B /* UIViewExtensions.swift in Sources */,
 				69ACD6FC2AFD133A0021127B /* UserDefaultsExtensions.swift in Sources */,

CHANGELOG.md

@@ -7,7 +7,8 @@
 ```
 
 ## Next
-- Support tvOS & watchOS, use single multiplatform target for Carthage ([#14%](https://github.com/AckeeCZ/ACKategories/pull/140), kudos to @olejnjak)
+- Add helper function for easier back gesture setup ([#141](https://github.com/AckeeCZ/ACKategories/pull/141), kudos to @leinhauplk)
+- Support tvOS & watchOS, use single multiplatform target for Carthage ([#140](https://github.com/AckeeCZ/ACKategories/pull/140), kudos to @olejnjak)
 - Add helpers for `SwiftUI.EdgeInsets` ([#138](https://github.com/AckeeCZ/ACKategories/pull/138), kudos to @olejnjak)
 - Bump deployment target to iOS 12 ([#137](https://github.com/AckeeCZ/ACKategories/pull/137), kudos to @olejnjak)
 - Add Font modifier for SwiftUI fonts ([#134](https://github.com/AckeeCZ/ACKategories/pull/134), kudos to @leinhauplk)

Sources/ACKategories/BackGesture.swift

@@ -0,0 +1,56 @@
+#if os(iOS)
+import UIKit
+
+private class BackGestureDelegate: NSObject {
+    // MARK: - Private properties
+
+    private weak var navigationController: UINavigationController?
+
+    // MARK: Initializers
+
+    init(
+        navigationController: UINavigationController
+    ) {
+        super.init()
+        self.navigationController = navigationController
+    }
+}
+
+// MARK: - UIGestureRecognizerDelegate
+extension BackGestureDelegate: UIGestureRecognizerDelegate {
+    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
+        navigationController.map { $0.viewControllers.count > 1 } ?? false
+    }
+}
+
+extension UINavigationController {
+    private enum Keys {
+        static var backGestureDelegate: UInt8 = 0
+    }
+
+    private var backGestureDelegate: BackGestureDelegate {
+        if let delegate = objc_getAssociatedObject(self, &Keys.backGestureDelegate) as? BackGestureDelegate {
+            return delegate
+        }
+
+        let delegate = BackGestureDelegate(navigationController: self)
+        objc_setAssociatedObject(
+            self,
+            &Keys.backGestureDelegate,
+            delegate,
+            .OBJC_ASSOCIATION_RETAIN
+        )
+        return delegate
+    }
+
+    /// Add custom interactivePopGestureRecognizer delegate so it works even with hidden navigationBar
+    public func setupCustomBackGestureDelegate() {
+        assert(isViewLoaded, "View needs to be already loaded")
+        assert(
+            interactivePopGestureRecognizer != nil,
+            "Cannot install gesture delegate on nil recognizer"
+        )
+        interactivePopGestureRecognizer?.delegate = backGestureDelegate
+    }
+}
+#endif