iOS (Swift) - UIViewControllers 数组

Question

I have an array UIButton s that have a unique tag value. When a given button is pressed, I want to load and present a UIViewController that is also stored in an array of equal length.

The UIViewController s to be presented are subclasses of a subclass of UIViewController :

class AViewController: UIViewController {}
class BViewController: AViewController {}
class CViewController: AViewController {}
class DViewController: AViewController {}
// ... etc.

I've tried storing the array of AViewController subclasses using the following:

private var array: [AViewController] = [BViewController.self, CViewController.self, DViewController.self]

but I get the error Cannot convert value of type '[BViewController].Type' to specified type '[AViewController]' for the first element.

I will then present BViewController (for instance) using the following:

let ViewController = array[button.tag].self
var viewController: AViewController
viewController = ViewController.init()
viewController.transitioningDelegate = self
viewController.modalPresentationStyle = .custom
present(viewController, animated: true)

Please let me know if this is the incorrect thought process for doing something like this please and thanks for any help.

Answer 1

I have an array UIButton s that have a unique tag value. When a given button is pressed, I want to load and present a UIViewController that is also stored in an array of equal length.

The UIViewController s to be presented are subclasses of a subclass of UIViewController :

class AViewController: UIViewController {}
class BViewController: AViewController {}
class CViewController: AViewController {}
class DViewController: AViewController {}
// ... etc.

I've tried storing the array of AViewController subclasses using the following:

private var array: [AViewController] = [BViewController.self, CViewController.self, DViewController.self]

but I get the error Cannot convert value of type '[BViewController].Type' to specified type '[AViewController]' for the first element.

I will then present BViewController (for instance) using the following:

let ViewController = array[button.tag].self
var viewController: AViewController
viewController = ViewController.init()
viewController.transitioningDelegate = self
viewController.modalPresentationStyle = .custom
present(viewController, animated: true)

Please let me know if this is the incorrect thought process for doing something like this please and thanks for any help.

Answer 2

I have an array UIButton s that have a unique tag value. When a given button is pressed, I want to load and present a UIViewController that is also stored in an array of equal length.

The UIViewController s to be presented are subclasses of a subclass of UIViewController :

class AViewController: UIViewController {}
class BViewController: AViewController {}
class CViewController: AViewController {}
class DViewController: AViewController {}
// ... etc.

I've tried storing the array of AViewController subclasses using the following:

private var array: [AViewController] = [BViewController.self, CViewController.self, DViewController.self]

but I get the error Cannot convert value of type '[BViewController].Type' to specified type '[AViewController]' for the first element.

I will then present BViewController (for instance) using the following:

let ViewController = array[button.tag].self
var viewController: AViewController
viewController = ViewController.init()
viewController.transitioningDelegate = self
viewController.modalPresentationStyle = .custom
present(viewController, animated: true)

Please let me know if this is the incorrect thought process for doing something like this please and thanks for any help.

Answer 3

Alternate answer if you want to store array of view controllers as a constant.

 struct AppConstant {

       static let yourViewControllers: [AnyClass] = [AViewController.self, 
            BViewController.self, CViewController.self]
}