Swift: Implementing Protocol Initializer in a Class

Question

I am trying to understand why Swift enforces a class that conforms to a protocol with an initializer to be marked as required. This essentially enforces any subclasses to also i

Answer 1

You're not force to implement the initializer in the subclass. Consider this example, which compiles just fine:

protocol SomeProtocol {
    init(someParameter: Int)
}


class SomeClass: SomeProtocol {
    required init(someParameter: Int) {
        // initializer implementation goes here
        print(someParameter)
    }
}


class SomeSubclass: SomeClass {
    // Notice that no inits are implemented here
}

_ = SomeClass(someParameter: 123)
_ = SomeSubclass(someParameter: 456)