Can I define 2 typealias like this?
typealias MyViewControllerTypeOne = UIViewController
typealias MyViewControllerTypeTwo = UIViewController, MyGreatProtocol
I already know that the second one does not work with this syntax.
But what is the way to get the result I want? (I presume what I want is pretty obvious here.)
In Swift 4 you can now compose a class with any number of protocols by using the & operator:
typealias MyViewControllerTypeTwo = UIViewController & MyGreatProtocol
Check the WWDC 2017 "What's New in Swift" around 05:23.
You can also see the section "Protocol Composition" in the Swift 4.0 documentation, although it doesn't mention composing classes with protocols.
You can do it as a tuple -
typealias tupleAlias = (viewController :UIViewController,protocol: MyGreatProtocol)
EDIT: example use-
typealias PersonTuple = (name: String, address: String)
override func viewDidLoad() {
super.viewDidLoad()
let tupleInstance = getPerson(for: "Jack")
print(tupleInstance.address)//Prints India
}
func getPerson(for name: String) -> PersonTuple {
return (name, "India")
}