v2-customButtons (#2637)

* v2-customButtons

* Update RNNRootViewController.m

lib/ios/RNNNavigationButtons.m

 -(RNNUIBarButtonItem*)buildButton: (NSDictionary*)dictionary {
 	NSString* buttonId = dictionary[@"id"];
 	NSString* title = dictionary[@"title"];
+	NSString* component = dictionary[@"component"];
 	
 	if (!buttonId) {
 		@throw [NSException exceptionWithName:@"NSInvalidArgumentException" reason:[@"button id is not specified " stringByAppendingString:title] userInfo:nil];
 	}
 	
 	RNNUIBarButtonItem *barButtonItem;
-	if (iconImage) {
+	if (component) {
+		RCTRootView *view = (RCTRootView*)[self.viewController.creator createRootView:component rootViewId:buttonId];
+		barButtonItem = [[RNNUIBarButtonItem alloc] init:buttonId withCustomView:view];
+	} else if (iconImage) {
 		barButtonItem = [[RNNUIBarButtonItem alloc] init:buttonId withIcon:iconImage];
 	} else if (title) {
 		barButtonItem = [[RNNUIBarButtonItem alloc] init:buttonId withTitle:title];

lib/ios/RNNRootViewController.h

 @property (nonatomic, strong) RNNEventEmitter *eventEmitter;
 @property (nonatomic, strong) NSString* componentId;
 @property (nonatomic, strong) RNNTopTabsViewController* topTabsViewController;
+@property (nonatomic) id<RNNRootViewCreator> creator;
 @property (nonatomic, strong) RNNAnimator* animator;
 
 -(instancetype)initWithName:(NSString*)name

lib/ios/RNNRootViewController.m

 @interface RNNRootViewController()
 @property (nonatomic, strong) NSString* componentName;
 @property (nonatomic) BOOL _statusBarHidden;
-@property (nonatomic) id<RNNRootViewCreator> creator;
 @end
 
 @implementation RNNRootViewController

lib/ios/RNNUIBarButtonItem.h

 #import <Foundation/Foundation.h>
+#import <React/RCTRootView.h>
+#import <React/RCTRootViewDelegate.h>
 
-@interface RNNUIBarButtonItem : UIBarButtonItem
+@interface RNNUIBarButtonItem : UIBarButtonItem <RCTRootViewDelegate>
 
 @property (nonatomic, strong) NSString* buttonId;
 
 -(instancetype)init:(NSString*)buttonId withIcon:(UIImage*)iconImage;
 -(instancetype)init:(NSString*)buttonId withTitle:(NSString*)title;
+-(instancetype)init:(NSString*)buttonId withCustomView:(RCTRootView*)reactView;
 
 @end
 

lib/ios/RNNUIBarButtonItem.m

 	return self;
 }
 
+-(instancetype)init:(NSString*)buttonId withCustomView:(RCTRootView *)reactView {
+	self = [super initWithCustomView:reactView];
+	
+	reactView.sizeFlexibility = RCTRootViewSizeFlexibilityWidthAndHeight;
+	reactView.delegate = self;
+	reactView.backgroundColor = [UIColor clearColor];
+	self.buttonId = buttonId;
+	return self;
+}
+
+- (void)rootViewDidChangeIntrinsicSize:(RCTRootView *)rootView {
+	CGSize size = rootView.intrinsicContentSize;
+	rootView.frame = CGRectMake(0, 0, size.width, size.height);
+	self.width = size.width;
+}
+
 @end