CODEWITHSUNDEEP
swiftgenericsparameters
Daniel
Daniel

Reputation: 436

Generic type parameter as variable

Is there a way to dynamically pass a type parameter to a generic swift class? The below is just for illustration purposes from a playground which gives the error: use of undeclared type 'button'

import Cocoa

class PrintNameOfClass<T: NSObject> {
    func printType() {
        print(type(of: T.self))
    }
}

let button = NSButton()
let test = PrintNameOfClass<button>()
test.printType()

Upvotes: 0

Views: 194

Answers (1)

vadian
vadian

Reputation: 285059

In this case it's more reasonable to make the function generic rather than the class to be able to pass the instance button

class PrintNameOfClass {
    func printNameOfClass<T : NSObject>(of : T) {
        print(type(of: T.self))
    }
}

let button = NSButton()
let test = PrintNameOfClass()
test.printNameOfClass(of: button)

Upvotes: 1

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