Swift: Property conforming to a specific class and in the same time to multiple protocols

Question

In Objective-C, it\'s possible to write something like that:

@property(retain) UIView *myView;

But how can

Answer 1

In Swift 4 it's finally possible. You can declare variable of some class conforming to protocol at the same time, like this:

class ClassA {
    var someVar: String?
}

protocol ProtocolA {}

class ClassB {
    var someOptional: (ClassA & ProtocolA)? // here is optional value
    var some: ClassA & ProtocolA // here is non-optional value; need to provide init though :)
}