[V2] Fix iOS pop gesture when topBar is hidden (#4568)

* Fix iOS pop gesture when nav bar is hidden

* Add missing property

* Factor out InteractivePopGestureDelegate into its own file

* Add missing import

* Make sure fix supports hidden and visible nav bars

* Minor code style fix

lib/ios/InteractivePopGestureDelegate.h

+//
+//  InteractivePopGestureDelegate.h
+//  ReactNativeNavigation
+//
+//  Created by Arman Dezfuli-Arjomandi on 1/10/19.
+//  Copyright © 2019 Wix. All rights reserved.
+//
+//
+
+// This file is adapted from the following StackOverflow answer:
+// https://stackoverflow.com/questions/24710258/no-swipe-back-when-hiding-navigation-bar-in-uinavigationcontroller/41895151#41895151
+
+#import <UIKit/UIKit.h>
+
+@interface InteractivePopGestureDelegate : NSObject <UIGestureRecognizerDelegate>
+
+@property (nonatomic, weak) UINavigationController *navigationController;
+@property (nonatomic, weak) id<UIGestureRecognizerDelegate> originalDelegate;
+
+@end

lib/ios/InteractivePopGestureDelegate.m

+//
+//  InteractivePopGestureDelegate.m
+//  ReactNativeNavigation
+//
+//  Created by Arman Dezfuli-Arjomandi on 1/10/19.
+//  Copyright © 2019 Wix. All rights reserved.
+//
+
+#import "InteractivePopGestureDelegate.h"
+
+@implementation InteractivePopGestureDelegate
+
+- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
+	if (self.navigationController.navigationBarHidden && self.navigationController.viewControllers.count > 1) {
+		return YES;
+	} else if (!self.navigationController.navigationBarHidden && self.originalDelegate == nil) {
+		return YES;
+	} else {
+		return [self.originalDelegate gestureRecognizer:gestureRecognizer shouldReceiveTouch:touch];
+	}
+}
+
+- (BOOL)respondsToSelector:(SEL)aSelector {
+	if (aSelector == @selector(gestureRecognizer:shouldReceiveTouch:)) {
+		return YES;
+	} else {
+		return [self.originalDelegate respondsToSelector:aSelector];
+	}
+}
+
+- (id)forwardingTargetForSelector:(SEL)aSelector {
+	return self.originalDelegate;
+}
+
+@end

lib/ios/RNNNavigationController.m

 #import "RNNNavigationController.h"
 #import "RNNModalAnimation.h"
 #import "RNNRootViewController.h"
+#import "InteractivePopGestureDelegate.h"
 
 const NSInteger TOP_BAR_TRANSPARENT_TAG = 78264803;
 

lib/ios/RNNNavigationControllerPresenter.h

 #import "RNNBasePresenter.h"
 #import "RNNRootViewCreator.h"
 #import "RNNReactComponentRegistry.h"
+#import "InteractivePopGestureDelegate.h"
 
 @interface RNNNavigationControllerPresenter : RNNBasePresenter
 
+@property (nonatomic, strong) InteractivePopGestureDelegate *interactivePopGestureDelegate;
+
 - (instancetype)initWithcomponentRegistry:(RNNReactComponentRegistry *)componentRegistry;
 
 - (void)applyOptionsBeforePopping:(RNNNavigationOptions *)options;

lib/ios/RNNNavigationControllerPresenter.m

 	
 	RNNNavigationController* navigationController = self.bindedViewController;
 	
+	self.interactivePopGestureDelegate = [InteractivePopGestureDelegate new];
+	self.interactivePopGestureDelegate.navigationController = navigationController;
+	self.interactivePopGestureDelegate.originalDelegate = navigationController.interactivePopGestureRecognizer.delegate;
+	navigationController.interactivePopGestureRecognizer.delegate = self.interactivePopGestureDelegate;
+	
 	[navigationController rnn_setInteractivePopGestureEnabled:[options.popGesture getWithDefaultValue:YES]];
 	[navigationController rnn_setRootBackgroundImage:[options.rootBackgroundImage getWithDefaultValue:nil]];
 	[navigationController rnn_setNavigationBarTestID:[options.topBar.testID getWithDefaultValue:nil]];

lib/ios/ReactNativeNavigation.xcodeproj/project.pbxproj

 		7BEF0D1D1E43771B003E96B0 /* RNNLayoutNode.m in Sources */ = {isa = PBXBuildFile; fileRef = 7BEF0D1B1E43771B003E96B0 /* RNNLayoutNode.m */; };
 		A7626BFD1FC2FB2C00492FB8 /* RNNTopBarOptions.m in Sources */ = {isa = PBXBuildFile; fileRef = A7626BFC1FC2FB2C00492FB8 /* RNNTopBarOptions.m */; };
 		A7626C011FC5796200492FB8 /* RNNBottomTabsOptions.m in Sources */ = {isa = PBXBuildFile; fileRef = A7626C001FC5796200492FB8 /* RNNBottomTabsOptions.m */; };
+		C2A57A1C21E815F80066711C /* InteractivePopGestureDelegate.h in Headers */ = {isa = PBXBuildFile; fileRef = C2A57A1A21E815F80066711C /* InteractivePopGestureDelegate.h */; };
+		C2A57A1D21E815F80066711C /* InteractivePopGestureDelegate.m in Sources */ = {isa = PBXBuildFile; fileRef = C2A57A1B21E815F80066711C /* InteractivePopGestureDelegate.m */; };
 		E33AC20020B5BA0B0090DB8A /* RNNSplitViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = E33AC1FF20B5BA0B0090DB8A /* RNNSplitViewController.m */; };
 		E33AC20520B5C3890090DB8A /* RNNStatusBarOptions.m in Sources */ = {isa = PBXBuildFile; fileRef = E33AC20320B5C3890090DB8A /* RNNStatusBarOptions.m */; };
 		E33AC20820B5C4F90090DB8A /* RNNSplitViewOptions.m in Sources */ = {isa = PBXBuildFile; fileRef = E33AC20720B5C4F90090DB8A /* RNNSplitViewOptions.m */; };
 		A7626BFE1FC2FB6700492FB8 /* RNNTopBarOptions.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = RNNTopBarOptions.h; sourceTree = "<group>"; };
 		A7626BFF1FC578AB00492FB8 /* RNNBottomTabsOptions.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = RNNBottomTabsOptions.h; sourceTree = "<group>"; };
 		A7626C001FC5796200492FB8 /* RNNBottomTabsOptions.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = RNNBottomTabsOptions.m; sourceTree = "<group>"; };
+		C2A57A1A21E815F80066711C /* InteractivePopGestureDelegate.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = InteractivePopGestureDelegate.h; sourceTree = "<group>"; };
+		C2A57A1B21E815F80066711C /* InteractivePopGestureDelegate.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = InteractivePopGestureDelegate.m; sourceTree = "<group>"; };
 		D8AFADBD1BEE6F3F00A4592D /* libReactNativeNavigation.a */ = {isa = PBXFileReference; explicitFileType = archive.ar; includeInIndex = 0; path = libReactNativeNavigation.a; sourceTree = BUILT_PRODUCTS_DIR; };
 		E33AC1FF20B5BA0B0090DB8A /* RNNSplitViewController.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = RNNSplitViewController.m; sourceTree = "<group>"; };
 		E33AC20120B5BA550090DB8A /* RNNSplitViewController.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = RNNSplitViewController.h; sourceTree = "<group>"; };
 				5038A3BC216E1490009280BC /* RNNTabBarItemCreator.m */,
 				5053CE7D2175FB1900D0386B /* RNNDefaultOptionsHelper.h */,
 				5053CE7E2175FB1900D0386B /* RNNDefaultOptionsHelper.m */,
+				C2A57A1A21E815F80066711C /* InteractivePopGestureDelegate.h */,
+				C2A57A1B21E815F80066711C /* InteractivePopGestureDelegate.m */,
 			);
 			name = Helpers;
 			sourceTree = "<group>";
 				E8AEDB4A1F5C0BAF000F5A6A /* RNNInteractivePopAnimator.h in Headers */,
 				263905B71E4C6F440023D7D3 /* UIViewController+MMDrawerController.h in Headers */,
 				263905BB1E4C6F440023D7D3 /* RCCDrawerHelper.h in Headers */,
+				C2A57A1C21E815F80066711C /* InteractivePopGestureDelegate.h in Headers */,
 				263905CC1E4C6F440023D7D3 /* SidebarWunderlistAnimation.h in Headers */,
 				507F43F41FF4FCFE00D9425B /* HMSegmentedControl.h in Headers */,
 				501CD31F214A5B6900A6E225 /* RNNLayoutInfo.h in Headers */,
 				50F5DFC21F407A8C001A00BC /* RNNTabBarController.m in Sources */,
 				50887CA920F26BFE00D06111 /* RNNOverlayWindow.m in Sources */,
 				5038A3CF216E35E0009280BC /* Dictionary.m in Sources */,
+				C2A57A1D21E815F80066711C /* InteractivePopGestureDelegate.m in Sources */,
 				263905BC1E4C6F440023D7D3 /* RCCDrawerHelper.m in Sources */,
 				4534E72620CB6724009F8185 /* RNNLargeTitleOptions.m in Sources */,
 				507E7D58201DDD3000444E6C /* RNNAnimationOptions.m in Sources */,