setRoot on main application window - fix setRoot on iPad

lib/ios/RNNBridgeManager.m

 	id<RNNRootViewCreator> rootViewCreator = [[RNNReactRootViewCreator alloc] initWithBridge:bridge];
 	RNNControllerFactory *controllerFactory = [[RNNControllerFactory alloc] initWithRootViewCreator:rootViewCreator eventEmitter:eventEmitter andBridge:bridge];
 	
-	_commandsHandler = [[RNNCommandsHandler alloc] initWithStore:_store controllerFactory:controllerFactory eventEmitter:eventEmitter stackManager:[RNNNavigationStackManager new] modalManager:[RNNModalManager new] overlayManager:[RNNOverlayManager new]];
+	_commandsHandler = [[RNNCommandsHandler alloc] initWithStore:_store controllerFactory:controllerFactory eventEmitter:eventEmitter stackManager:[RNNNavigationStackManager new] modalManager:[RNNModalManager new] overlayManager:[RNNOverlayManager new] mainWindow:[UIApplication sharedApplication].keyWindow];
 	RNNBridgeModule *bridgeModule = [[RNNBridgeModule alloc] initWithCommandsHandler:_commandsHandler];
 
 	return [@[bridgeModule,eventEmitter] arrayByAddingObjectsFromArray:[self extraModulesFromDelegate]];

lib/ios/RNNCommandsHandler.h

 
 @interface RNNCommandsHandler : NSObject
 
-- (instancetype)initWithStore:(RNNStore*)store controllerFactory:(RNNControllerFactory*)controllerFactory eventEmitter:(RNNEventEmitter *)eventEmitter stackManager:(RNNNavigationStackManager *)stackManager modalManager:(RNNModalManager *)modalManager overlayManager:(RNNOverlayManager *)overlayManager;
+- (instancetype)initWithStore:(RNNStore*)store controllerFactory:(RNNControllerFactory*)controllerFactory eventEmitter:(RNNEventEmitter *)eventEmitter stackManager:(RNNNavigationStackManager *)stackManager modalManager:(RNNModalManager *)modalManager overlayManager:(RNNOverlayManager *)overlayManager mainWindow:(UIWindow *)mainWindow;
 
 - (void)setRoot:(NSDictionary*)layout completion:(RNNTransitionCompletionBlock)completion;
 

lib/ios/RNNCommandsHandler.m

 	RNNOverlayManager* _overlayManager;
 	RNNNavigationStackManager* _stackManager;
 	RNNEventEmitter* _eventEmitter;
+	UIWindow* _mainWindow;
 }
 
-- (instancetype)initWithStore:(RNNStore*)store controllerFactory:(RNNControllerFactory*)controllerFactory eventEmitter:(RNNEventEmitter *)eventEmitter stackManager:(RNNNavigationStackManager *)stackManager modalManager:(RNNModalManager *)modalManager overlayManager:(RNNOverlayManager *)overlayManager {
+- (instancetype)initWithStore:(RNNStore*)store controllerFactory:(RNNControllerFactory*)controllerFactory eventEmitter:(RNNEventEmitter *)eventEmitter stackManager:(RNNNavigationStackManager *)stackManager modalManager:(RNNModalManager *)modalManager overlayManager:(RNNOverlayManager *)overlayManager mainWindow:(UIWindow *)mainWindow {
 	self = [super init];
 	_store = store;
 	_controllerFactory = controllerFactory;
 	_modalManager.delegate = self;
 	_stackManager = stackManager;
 	_overlayManager = overlayManager;
+	_mainWindow = mainWindow;
 	return self;
 }
 
 	[self assertReady];
 	
 	[_modalManager dismissAllModalsAnimated:NO];
-	[_store removeAllComponentsFromWindow:UIApplication.sharedApplication.delegate.window];
+	[_store removeAllComponentsFromWindow:_mainWindow];
 	
 	UIViewController *vc = [_controllerFactory createLayout:layout[@"root"] saveToStore:_store];
 	
-	[UIApplication sharedApplication].windows.firstObject.rootViewController = vc;
-
+	_mainWindow.rootViewController = vc;
+	
 	[_eventEmitter sendOnNavigationCommandCompletion:setRoot params:@{@"layout": layout}];
 	completion();
 }
 		
 		[vc overrideOptions:newOptions];
 		[vc mergeOptions:newOptions];
-
+		
 		[CATransaction commit];
 	}
 }
 		if([vc isKindOfClass:[RNNRootViewController class]]) {
 			RNNRootViewController* rootVc = (RNNRootViewController*)vc;
 			rootVc.previewController = newVc;
-
-      		rootVc.previewCallback = ^(UIViewController *vcc) {
+			
+			rootVc.previewCallback = ^(UIViewController *vcc) {
 				RNNRootViewController* rvc  = (RNNRootViewController*)vcc;
 				[self->_eventEmitter sendOnPreviewCompleted:componentId previewComponentId:newVc.layoutInfo.componentId];
 				if ([newVc.resolveOptions.preview.commit getWithDefaultValue:NO]) {
 			if (newVc.resolveOptions.preview.width.hasValue || newVc.resolveOptions.preview.height.hasValue) {
 				newVc.preferredContentSize = size;
 			}
-      
+			
 			RCTExecuteOnMainQueue(^{
 				UIView *view = [[ReactNativeNavigation getBridge].uiManager viewForReactTag:newVc.resolveOptions.preview.reactTag.get];
 				[rootVc registerForPreviewingWithDelegate:(id)rootVc sourceView:view];

lib/ios/ReactNativeNavigationTests/RNNCommandsHandlerTest.m

 @property (nonatomic, strong) RNNRootViewController* vc2;
 @property (nonatomic, strong) RNNRootViewController* vc3;
 @property (nonatomic, strong) MockUINavigationController* nvc;
+@property (nonatomic, strong) id mainWindow;
 @property (nonatomic, strong) id controllerFactory;
 @property (nonatomic, strong) id overlayManager;
 @property (nonatomic, strong) id eventEmmiter;
 
 - (void)setUp {
 	[super setUp];
+	self.mainWindow = [OCMockObject partialMockForObject:[UIWindow new]];
 	self.store = [OCMockObject partialMockForObject:[[RNNStore alloc] init]];
 	self.eventEmmiter = [OCMockObject partialMockForObject:[RNNEventEmitter new]];
 	self.overlayManager = [OCMockObject partialMockForObject:[RNNOverlayManager new]];
 	self.controllerFactory = [OCMockObject partialMockForObject:[[RNNControllerFactory alloc] initWithRootViewCreator:nil eventEmitter:self.eventEmmiter andBridge:nil]];
-	self.uut = [[RNNCommandsHandler alloc] initWithStore:self.store controllerFactory:self.controllerFactory eventEmitter:self.eventEmmiter stackManager:[RNNNavigationStackManager new] modalManager:[RNNModalManager new] overlayManager:self.overlayManager];
+	self.uut = [[RNNCommandsHandler alloc] initWithStore:self.store controllerFactory:self.controllerFactory eventEmitter:self.eventEmmiter stackManager:[RNNNavigationStackManager new] modalManager:[RNNModalManager new] overlayManager:self.overlayManager mainWindow:self.mainWindow];
 	self.vc1 = [RNNRootViewController new];
 	self.vc2 = [RNNRootViewController new];
 	self.vc3 = [RNNRootViewController new];
 
 -(NSArray*) getPublicMethodNamesForObject:(NSObject*)obj{
 	NSMutableArray* skipMethods = [NSMutableArray new];
-
-	[skipMethods addObject:@"initWithStore:controllerFactory:eventEmitter:stackManager:modalManager:overlayManager:"];
+	
+	[skipMethods addObject:@"initWithStore:controllerFactory:eventEmitter:stackManager:modalManager:overlayManager:mainWindow:"];
 	[skipMethods addObject:@"assertReady"];
 	[skipMethods addObject:@"removePopedViewControllers:"];
 	[skipMethods addObject:@".cxx_destruct"];
 	[skipMethods addObject:@"dismissedModal:"];
 	[skipMethods addObject:@"dismissedMultipleModals:"];
-
+	
 	NSMutableArray* result = [NSMutableArray new];
-
+	
 	// count and names:
 	int i=0;
 	unsigned int mc = 0;
 	Method * mlist = class_copyMethodList(object_getClass(obj), &mc);
-
+	
 	for(i=0; i<mc; i++) {
 		NSString *methodName = [NSString stringWithUTF8String:sel_getName(method_getName(mlist[i]))];
-
+		
 		// filter skippedMethods
 		if (methodName && ![skipMethods containsObject:methodName]) {
 			[result addObject:methodName];
 		}
 	}
-
+	
 	return result;
 }
 
 	
 	[vc viewWillAppear:false];
 	XCTAssertTrue([vc.navigationItem.title isEqual:@"the title"]);
-
+	
 	[self.store setReadyToReceiveCommands:true];
 	[self.store setComponent:vc componentId:@"componentId"];
 	
 	NSDictionary* dictFromJs = @{@"topBar": @{@"background" : @{@"color" : @(0xFFFF0000)}}};
 	UIColor* expectedColor = [UIColor colorWithRed:1 green:0 blue:0 alpha:1];
-
+	
 	[self.uut mergeOptions:@"componentId" options:dictFromJs completion:^{
 		XCTAssertTrue([vc.navigationItem.title isEqual:@"the title"]);
 		XCTAssertTrue([nav.navigationBar.barTintColor isEqual:expectedColor]);
 - (void)testPop_removeTopVCFromStore {
 	[self.store setReadyToReceiveCommands:true];
 	XCTestExpectation *expectation = [self expectationWithDescription:@"Testing Async Method"];
-
+	
 	[self.uut pop:@"vc3" mergeOptions:nil completion:^{
 		XCTAssertNil([self.store findComponentForId:@"vc3"]);
 		XCTAssertNotNil([self.store findComponentForId:@"vc2"]);
 	[self.store setReadyToReceiveCommands:true];
 	OCMStub([self.overlayManager showOverlayWindow:[OCMArg any]]);
 	OCMStub([self.controllerFactory createLayout:[OCMArg any] saveToStore:[OCMArg any]]);
-
+	
 	NSDictionary* layout = @{};
 	
 	[[self.eventEmmiter expect] sendOnNavigationCommandCompletion:@"showOverlay" params:[OCMArg any]];
 - (void)testDismissOverlay_handleErrorIfNoOverlayExists {
 	[self.store setReadyToReceiveCommands:true];
 	NSString* componentId = @"componentId";
-    id errorHandlerMockClass = [OCMockObject mockForClass:[RNNErrorHandler class]];
+	id errorHandlerMockClass = [OCMockObject mockForClass:[RNNErrorHandler class]];
 	
-    [[errorHandlerMockClass expect] reject:[OCMArg any] withErrorCode:1010 errorDescription:[OCMArg any]];
-    [self.uut dismissOverlay:componentId completion:[OCMArg any] rejection:[OCMArg any]];
-    [errorHandlerMockClass verify];
+	[[errorHandlerMockClass expect] reject:[OCMArg any] withErrorCode:1010 errorDescription:[OCMArg any]];
+	[self.uut dismissOverlay:componentId completion:[OCMArg any] rejection:[OCMArg any]];
+	[errorHandlerMockClass verify];
 }
 
 - (void)testDismissOverlay_invokeNavigationCommandEvent {
 	[self.uut dismissOverlay:componentId completion:^{
 		
 	} rejection:^(NSString *code, NSString *message, NSError *error) {}];
-	 
+	
 	[self.eventEmmiter verify];
 }
 
+- (void)testSetRoot_setRootViewControllerOnMainWindow {
+	[self.store setReadyToReceiveCommands:true];
+	OCMStub([self.controllerFactory createLayout:[OCMArg any] saveToStore:self.store]).andReturn(self.vc1);
+	
+	[[self.mainWindow expect] setRootViewController:self.vc1];
+	[self.uut setRoot:@{} completion:^{}];
+	[self.mainWindow verify];
+}
+
+- (void)testSetRoot_removeAllComponentsFromMainWindow {
+	[self.store setReadyToReceiveCommands:true];
+	OCMStub([self.controllerFactory createLayout:[OCMArg any] saveToStore:self.store]).andReturn(self.vc1);
+	
+	[[self.store expect] removeAllComponentsFromWindow:self.mainWindow];
+	[self.uut setRoot:@{} completion:^{}];
+	[self.store verify];
+}
+
 @end