Custom init for UIViewController in Swift with interface setup in storyboard

Question

I\'m having issue for writing custom init for subclass of UIViewController, basically I want to pass the dependency through the init method for viewController rather than se

Answer 1

Although we can now do custom init for the default controllers in the storyboard using instantiateInitialViewController(creator:) and for segues including relationship and show.

This capability was added in Xcode 11 and the following is an excerpt from the Xcode 11 Release Notes:

A view controller method annotated with the new @IBSegueAction attribute can be used to create a segue’s destination view controller in code, using a custom initializer with any required values. This makes it possible to use view controllers with non-optional initialization requirements in storyboards. Create a connection from a segue to an @IBSegueAction method on its source view controller. On new OS versions that support Segue Actions, that method will be called and the value it returns will be the destinationViewController of the segue object passed to prepareForSegue:sender:. Multiple @IBSegueAction methods may be defined on a single source view controller, which can alleviate the need to check segue identifier strings in prepareForSegue:sender:. (47091566)

An IBSegueAction method takes up to three parameters: a coder, the sender, and the segue’s identifier. The first parameter is required, and the other parameters can be omitted from your method’s signature if desired. The NSCoder must be passed through to the destination view controller’s initializer, to ensure it’s customized with values configured in storyboard. The method returns a view controller that matches the destination controller type defined in the storyboard, or nil to cause a destination controller to be initialized with the standard init(coder:) method. If you know you don’t need to return nil, the return type can be non-optional.

In Swift, add the @IBSegueAction attribute:

@IBSegueAction
func makeDogController(coder: NSCoder, sender: Any?, segueIdentifier: String?) -> ViewController? {
    PetController(
        coder: coder,
        petName:  self.selectedPetName, type: .dog
    )
}

In Objective-C, add IBSegueAction in front of the return type:

- (IBSegueAction ViewController *)makeDogController:(NSCoder *)coder
               sender:(id)sender
      segueIdentifier:(NSString *)segueIdentifier
{
   return [PetController initWithCoder:coder
                               petName:self.selectedPetName
                                  type:@"dog"];
}