Multiple Storyboard Usage

Multiple Storyboard Usage.txt

@interface UIStoryboard (Additions)
- (id __nullable)tryInstantiateViewControllerWithIdentifier:(NSString * __nonnull)identifier;
@end

@implementation UIStoryboard (Additions)
- (id)tryInstantiateViewControllerWithIdentifier:(NSString *)identifier {
    @try {
        return [self instantiateViewControllerWithIdentifier:identifier];
    }
    @catch (NSException *exception) {
        return nil;
    }
}
@end

private var storyboardIdForControllers = [String: String]()
private var allStoryboardIds = [String]() // Either manualy add them or use NSFilemanager and read all files with .storyboard extension

extension UIStoryboard {
    public class func instantiateViewController <T: UIViewController>(type: T.Type) -> T {
        let viewControllerId = String(type)
        
        if let storyboardId = storyboardIdForControllers[viewControllerId] {
            let storyboard = UIStoryboard(name: storyboardId, bundle: nil)
            return storyboard.instantiateViewControllerWithIdentifier(viewControllerId) as! T
        }
        else {
            for storyboardId in allStoryboardIds {
                let storyboard = UIStoryboard(name: storyboardId, bundle: nil)
                
                if let viewController = storyboard.tryInstantiateViewControllerWithIdentifier(viewControllerId) {
                    storyboardIdForControllers[viewControllerId] = storyboardId
                    return viewController as! T
                }
            }
            
            fatalError("Could not instantiate Viewcontroller with identifier: \(viewControllerId)")
        }
    }
}

extension UIViewController {
    public class func instantiateFromStoryBoard() -> Self {
        return UIStoryboard.instantiateViewController(self)
    }
}