iOS13SDK+FBSDKFix.m

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wundeclared-selector"

+ (void)initialize
{
	[super initialize];

#if __IPHONE_13_0
	// IOS-13-TODO: Work-around for Facebook SDK to force-use Safari auth session
	//              instead of AuthServices session as this requires specific
	//              presentation context in iOS 13
	if (isIOS13)
		[self swizzleSelector:@selector(swiz_fbsdkbridgeapi_opURLWAuthSess:) ofClass:self
				 withSelector:@selector(_openURLWithAuthenticationSession:) ofClass:NSClassFromString(@"FBSDKBridgeAPI")];
#endif
}

- (void)swiz_fbsdkbridgeapi_opURLWAuthSess:(NSURL *)url
{
	id val = [self valueForKey:@"_authenticationSession"];

	if (val) [val cancel];

	NSString *urlScheme = [NSClassFromString(@"FBSDKInternalUtility") performSelector:@selector(appURLScheme)];

	SFAuthenticationSession *_authenticationSession = [[SFAuthenticationSession alloc] initWithURL:url
		callbackURLScheme:urlScheme
		completionHandler:[self valueForKey:@"_authenticationSessionCompletionHandler"]];
	[self setValue:@YES forKey:@"_isRequestingSFAuthenticationSession"];
	[self setValue:_authenticationSession forKey:@"_authenticationSession"];
	[_authenticationSession start];
}

#pragma clang diagnostic pop