Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Create UIViewController from storyboard and pass parameter safely.
class UserListViewController: UIViewController {
func presentUserProfile(userId: String) {
let vc = UserProfileViewControllerFactory.create(userId: "xxxxx")
self.present(vc, animated: true, completion: nil)
}
}
public protocol StoryboardInstantiatable {
static var storyboardName: String { get }
static var viewControllerIdentifier: String? { get }
static var bundle: Bundle? { get }
}
public extension StoryboardInstantiatable where Self: UIViewController {
public static var storyboardName: String {
return String(describing: self)
}
public static var viewControllerIdentifier: String? {
return nil
}
public static var bundle: Bundle? {
return nil
}
public static func instantiate() -> Self {
let loadViewController = { () -> UIViewController? in
let storyboard = UIStoryboard(name: storyboardName, bundle: bundle)
if let viewControllerIdentifier = viewControllerIdentifier {
return storyboard.instantiateViewController(withIdentifier: viewControllerIdentifier)
} else {
return storyboard.instantiateInitialViewController()
}
}
guard let viewController = loadViewController() as? Self else {
fatalError()
}
return viewController
}
}
struct UserProfileViewControllerFactory {
private init() {}
static func create(userId: String) -> UserProfileViewController {
let vc = UserProfileViewController.instantiate()
vc.userId = userId
return vc
}
}
class UserProfileViewController: UIViewController {
fileprivate var userId: String!
override func viewDidLoad() {
super.viewDidLoad()
print(userId)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
extension UserProfileViewController: StoryboardInstantiatable {}
@malhal

This comment has been minimized.

Copy link

@malhal malhal commented Jul 17, 2019

You can now invoke a custom initializer from a creation block that's passed through instantiateInitialViewController(creator:) or instantiateViewController(identifier:creator:). This makes it possible for you to initialize view controllers with additional context and arguments, while taking advantage of defining them in a storyboard through Interface Builder. A custom controller initializer must call its super.init(coder:) method and pass the coder argument that it receives through the creation block. (48313869)

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment