react-native-navigation/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.intrinsicContentSize;
    rootView.frame = CGRectMake(0, 0, size.width, size.height);
    self.width = size.width;
}

@end