CODEWITHSUNDEEP
iosswiftuiviewcontrollercasting
Thomas Easo
Thomas Easo

Reputation: 3758

How to pass a Type of UIViewController to a function and type cast a variable in iOS Swift?

Explanation

I am defining a generic API method to handle popup across my application. Is it possible to pass a type of a UIViewController to a function and type cast the variable popOverVC in the function to the type of popUpVC ie., passed to the function as argument. All programs under Swift are appreciable

Reference Code

func showAsPopUp(currentVC: UIViewController,currentVCname: String, popupStoryboardID: String, popUpVC:UIViewController){
        let popUpVCType:AnyClass = type(of: popUpVC)
        let popOverVC = UIStoryboard(name: currentVCname, bundle: nil).instantiateInitialViewController(popupStoryboardID) as! popUpVCType
        currentVC.addChildViewController(popOverVC)
    }

Upvotes: 5

Views: 2647

Answers (1)

ZeMoon
ZeMoon

Reputation: 20284

This is a good situation to use generics.

func showAsPopUp<T: UIViewController>(currentVC: UIViewController,currentVCname: String, popupStoryboardID: String, popUpVC: T.type) {
    let popOverVC = UIStoryboard(name: currentVCname, bundle: nil).instantiateViewController(withIdentifier: popupStoryboardID) as! T
    currentVC.addChildViewController(popOverVC)
}

Not sure what your functionality is here, but this is how the generics would fit in with the above mentioned code.

The usage of the above method would look like:

showAsPopUp(currentVC: UIViewController(), currentVCname: "asdsadv", popupStoryboardID: "asd", popUpVC: SomePopUpViewController.self)

Upvotes: 7

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