Add custom bar button item class (#1641)

This allows for custom React Native views to be rendered as a bar button item in the navigation bar.

ios/RCCCustomBarButtonItem.h

+#import <UIKit/UIKit.h>
+
+@class RCTRootView;
+@class RCTBridge;
+
+@interface RCCCustomBarButtonItem : UIBarButtonItem
+
+@property (nonnull, nonatomic, strong, readonly) RCTRootView *reactView;
+
+- (__nonnull instancetype)initWithComponentName:(NSString *__nonnull)component passProps:(NSDictionary *__nullable)passProps bridge:(RCTBridge *__nonnull)bridge;
+
+@end

ios/RCCCustomBarButtonItem.m

+#import <React/RCTRootView.h>
+#import <React/RCTRootViewDelegate.h>
+#import "RCCCustomBarButtonItem.h"
+
+@interface RCCCustomBarButtonItem () <RCTRootViewDelegate>
+
+@property (nonnull, nonatomic, strong, readwrite) RCTRootView *reactView;
+
+@end
+
+@implementation RCCCustomBarButtonItem
+
+- (instancetype)initWithComponentName:(NSString *__nonnull)component passProps:(NSDictionary *)passProps bridge:(RCTBridge *__nonnull)bridge {
+    RCTRootView *reactView = [[RCTRootView alloc] initWithBridge:bridge moduleName:component initialProperties:passProps];
+    self = [super initWithCustomView:reactView];
+    if (self) {
+        reactView.sizeFlexibility = RCTRootViewSizeFlexibilityWidthAndHeight;
+        reactView.delegate = self;
+        reactView.backgroundColor = [UIColor clearColor];
+    }
+    return self;
+}
+
+- (void)rootViewDidChangeIntrinsicSize:(RCTRootView *)rootView {
+    CGSize size = rootView.intrinsicSize;
+    rootView.frame = CGRectMake(0, 0, size.width, size.height);
+    self.width = size.width;
+}
+
+@end

ios/RCCNavigationController.m

 #import "RCCManager.h"
 #import <React/RCTEventDispatcher.h>
 #import <React/RCTConvert.h>
+#import <React/RCTRootView.h>
 #import <objc/runtime.h>
 #import "RCCTitleViewHelper.h"
+#import "RCCCustomBarButtonItem.h"
 #import "UIViewController+Rotation.h"
 #import "RCTHelpers.h"
 
     UIImage *iconImage = nil;
     id icon = button[@"icon"];
     if (icon) iconImage = [RCTConvert UIImage:icon];
-    
+    NSString *__nullable component = button[@"component"];
+
     UIBarButtonItem *barButtonItem;
     if (iconImage)
     {
         [barButtonItem setTitleTextAttributes:buttonTextAttributes forState:UIControlStateNormal];
       }
     }
+    else if (component) {
+      RCTBridge *bridge = [[RCCManager sharedInstance] getBridge];
+      barButtonItem = [[RCCCustomBarButtonItem alloc] initWithComponentName:component passProps:button[@"passProps"] bridge:bridge];
+    }
     else continue;
     objc_setAssociatedObject(barButtonItem, &CALLBACK_ASSOCIATED_KEY, button[@"onPress"], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
     [barButtonItems addObject:barButtonItem];

ios/ReactNativeNavigation.xcodeproj/project.pbxproj

 		261108801E6C495400BF5D98 /* UIViewController+Rotation.m in Sources */ = {isa = PBXBuildFile; fileRef = 2611087F1E6C495400BF5D98 /* UIViewController+Rotation.m */; };
 		26714EAC1EB0E9D3009F4D52 /* RCCCustomTitleView.m in Sources */ = {isa = PBXBuildFile; fileRef = 26714EAB1EB0E9D3009F4D52 /* RCCCustomTitleView.m */; };
 		26AFF3F51D7EEE2400CBA211 /* RCCTitleViewHelper.m in Sources */ = {isa = PBXBuildFile; fileRef = 26AFF3F41D7EEE2400CBA211 /* RCCTitleViewHelper.m */; };
+		2DCD499A1F33AAC30035123A /* RCCCustomBarButtonItem.m in Sources */ = {isa = PBXBuildFile; fileRef = 2DCD49981F33AAC30035123A /* RCCCustomBarButtonItem.m */; };
 		CC84A19E1C1A0C4E00B3A6A2 /* RCCManager.m in Sources */ = {isa = PBXBuildFile; fileRef = CC84A1941C1A0C4E00B3A6A2 /* RCCManager.m */; };
 		CC84A19F1C1A0C4E00B3A6A2 /* RCCManagerModule.m in Sources */ = {isa = PBXBuildFile; fileRef = CC84A1961C1A0C4E00B3A6A2 /* RCCManagerModule.m */; };
 		CC84A1A01C1A0C4E00B3A6A2 /* RCCNavigationController.m in Sources */ = {isa = PBXBuildFile; fileRef = CC84A1981C1A0C4E00B3A6A2 /* RCCNavigationController.m */; };
 		26714EAB1EB0E9D3009F4D52 /* RCCCustomTitleView.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = RCCCustomTitleView.m; sourceTree = "<group>"; };
 		26AFF3F31D7EEE2400CBA211 /* RCCTitleViewHelper.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = RCCTitleViewHelper.h; path = Helpers/RCCTitleViewHelper.h; sourceTree = "<group>"; };
 		26AFF3F41D7EEE2400CBA211 /* RCCTitleViewHelper.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = RCCTitleViewHelper.m; path = Helpers/RCCTitleViewHelper.m; sourceTree = "<group>"; };
+2DCD49981F33AAC30035123A /* RCCCustomBarButtonItem.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = RCCCustomBarButtonItem.m; path = RCCCustomBarButtonItem.m; sourceTree = "<group>"; };
+		2DCD49991F33AAC30035123A /* RCCCustomBarButtonItem.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = RCCCustomBarButtonItem.h; path = RCCCustomBarButtonItem.h; sourceTree = "<group>"; };
 		CC84A1931C1A0C4E00B3A6A2 /* RCCManager.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCCManager.h; sourceTree = "<group>"; };
 		CC84A1941C1A0C4E00B3A6A2 /* RCCManager.m */ = {isa = PBXFileReference; fileEncoding = 4; indentWidth = 2; lastKnownFileType = sourcecode.c.objc; path = RCCManager.m; sourceTree = "<group>"; tabWidth = 2; };
 		CC84A1951C1A0C4E00B3A6A2 /* RCCManagerModule.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = RCCManagerModule.h; sourceTree = "<group>"; };
 				D85082BB1CBCF42400FDB961 /* RCCDrawerController */,
 				CC84A1931C1A0C4E00B3A6A2 /* RCCManager.h */,
 				CC84A1941C1A0C4E00B3A6A2 /* RCCManager.m */,
+				2DCD49991F33AAC30035123A /* RCCCustomBarButtonItem.h */,
+				2DCD49981F33AAC30035123A /* RCCCustomBarButtonItem.m */,
 				26714EAA1EB0E9D3009F4D52 /* RCCCustomTitleView.h */,
 				26714EAB1EB0E9D3009F4D52 /* RCCCustomTitleView.m */,
 				26AFF3F31D7EEE2400CBA211 /* RCCTitleViewHelper.h */,
 			files = (
 				D85082EA1CBCF54200FDB961 /* TheSidebarController.m in Sources */,
 				CC84A1A01C1A0C4E00B3A6A2 /* RCCNavigationController.m in Sources */,
+				2DCD499A1F33AAC30035123A /* RCCCustomBarButtonItem.m in Sources */,
 				D83514F61D29719A00D53758 /* RCCNotification.m in Sources */,
 				CC84A19F1C1A0C4E00B3A6A2 /* RCCManagerModule.m in Sources */,
 				26AFF3F51D7EEE2400CBA211 /* RCCTitleViewHelper.m in Sources */,