SafariViewManager.m

#import "SafariViewManager.h"
#import <React/RCTUtils.h>
#import <React/RCTLog.h>
#import <React/RCTConvert.h>

@implementation SafariViewManager
{
    bool hasListeners;
    SFSafariViewController *_safariView;
}

RCT_EXPORT_MODULE()

- (dispatch_queue_t)methodQueue
{
  return dispatch_get_main_queue();
}

- (void)startObserving
{
    hasListeners = YES;
}

- (void)stopObserving
{
    hasListeners = NO;
}

- (NSArray<NSString *> *)supportedEvents
{
    return @[@"SafariViewOnShow", @"SafariViewOnDismiss"];
}

RCT_EXPORT_METHOD(show:(NSDictionary *)args resolver:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject)
{
    // Error if no url is passed
    if (!args[@"url"]) {
        reject(@"E_SAFARI_VIEW_NO_URL", @"You must specify a url.", nil);
        return;
    }

    NSURL *url = [RCTConvert NSURL:args[@"url"]];
    BOOL readerMode = [args[@"readerMode"] boolValue];
    UIColor *tintColorString = args[@"tintColor"];
    UIColor *barTintColorString = args[@"barTintColor"];
    BOOL fromBottom = [args[@"fromBottom"] boolValue];
    NSString *dismissButtonStyleString = args[@"dismissButtonStyle"];
    BOOL preferNative = [args[@"preferNative"] boolValue];

    // Initialize the Safari View
    _safariView = [[SFSafariViewController alloc] initWithURL:url entersReaderIfAvailable:readerMode];
    _safariView.delegate = self;

    // set dismiss button style
    if ([_safariView respondsToSelector:@selector(setDismissButtonStyle:)] ) {
        if (@available(iOS 11.0, *)) {
            if ([dismissButtonStyleString isEqual:@"Close"]) {
                [_safariView setDismissButtonStyle:SFSafariViewControllerDismissButtonStyleClose];
            } else if ([dismissButtonStyleString isEqual:@"Cancel"]) {
                [_safariView setDismissButtonStyle:SFSafariViewControllerDismissButtonStyleCancel];
            } else {
                [_safariView setDismissButtonStyle:SFSafariViewControllerDismissButtonStyleDone];
            }
        }
    }

    // Set tintColor if available
    if (tintColorString) {
        UIColor *tintColor = [RCTConvert UIColor:tintColorString];
        if ([_safariView respondsToSelector:@selector(setPreferredControlTintColor:)]) {
            [_safariView setPreferredControlTintColor:tintColor];
        } else {
            [_safariView.view setTintColor:tintColor];
        }
    }

    // Set barTintColor if available
    if (barTintColorString) {
        UIColor *barTintColor = [RCTConvert UIColor:barTintColorString];
        if ([_safariView respondsToSelector:@selector(setPreferredBarTintColor:)]) {
            [_safariView setPreferredBarTintColor:barTintColor];
        }
    }

    // Set modal transition style
    if (fromBottom) {
        _safariView.modalPresentationStyle = UIModalPresentationOverFullScreen;
    }

    if (!preferNative) {
        [self openInSafariView];
        resolve(@YES);
        return;
    }

    [[UIApplication sharedApplication] openURL:url
                                       options:@{UIApplicationOpenURLOptionUniversalLinksOnly: @YES}
                             completionHandler:^(BOOL success) {
                                 if (!success) {
                                     [self openInSafariView];
                                 }

                                 resolve(@YES);
                             }
    ];
}

RCT_EXPORT_METHOD(isAvailable:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject)
{
    if (@available(iOS 9.0, *)) {
        // SafariView is available
        resolve(@YES);
    } else {
        reject(@"E_SAFARI_VIEW_UNAVAILABLE", @"SafariView is unavailable", nil);
    }
}

RCT_EXPORT_METHOD(dismiss)
{
    [_safariView dismissViewControllerAnimated:true completion:nil];
}

-(void)openInSafariView
{
    // get the view controller closest to the foreground
    UIViewController *ctrl = RCTPresentedViewController();

    // Display the Safari View
    [ctrl presentViewController:_safariView animated:YES completion:nil];

    if (hasListeners) {
        [self sendEventWithName:@"SafariViewOnShow" body:nil];
    }
}

-(void)safariViewControllerDidFinish:(nonnull SFSafariViewController *)controller
{
    _safariView = nil;
    NSLog(@"[SafariView] SafariView dismissed.");
    if (hasListeners) {
        [self sendEventWithName:@"SafariViewOnDismiss" body:nil];
    }
}
@end