How can I make a weak protocol reference in ‘pure’ Swift (without @objc)

i0S Swift Issue

Question or problem with Swift language programming:

weak references don’t seem to work in Swift unless a protocol is declared as @objc, which I don’t want in a pure Swift app.

This code gives a compile error (weak cannot be applied to non-class type MyClassDelegate):

class MyClass {
  weak var delegate: MyClassDelegate?
}

protocol MyClassDelegate {
}

I need to prefix the protocol with @objc, then it works.

Question: What is the ‘pure’ Swift way to accomplish a weak delegate?

How to solve the problem:

Solution 1:

You need to declare the type of the protocol as AnyObject.

protocol ProtocolNameDelegate: AnyObject {
    // Protocol stuff goes here
}

class SomeClass {
    weak var delegate: ProtocolNameDelegate?
}

Using AnyObject you say that only classes can conform to this protocol, whereas structs or enums can’t.

Solution 2:

Supplemental Answer

I was always confused about whether delegates should be weak or not. Recently I’ve learned more about delegates and when to use weak references, so let me add some supplemental points here for the sake of future viewers.

  • The purpose of using the weak keyword is to avoid strong reference cycles (retain cycles). Strong reference cycles happen when two class instances have strong references to each other. Their reference counts never go to zero so they never get deallocated.

  • You only need to use weak if the delegate is a class. Swift structs and enums are value types (their values are copied when a new instance is made), not reference types, so they don’t make strong reference cycles.

  • weak references are always optional (otherwise you would used unowned) and always use var (not let) so that the optional can be set to nil when it is deallocated.

  • A parent class should naturally have a strong reference to its child classes and thus not use the weak keyword. When a child wants a reference to its parent, though, it should make it a weak reference by using the weak keyword.

  • weak should be used when you want a reference to a class that you don’t own, not just for a child referencing its parent. When two non-hierarchical classes need to reference each other, choose one to be weak. The one you choose depends on the situation. See the answers to this question for more on this.

  • As a general rule, delegates should be marked as weak because most delegates are referencing classes that they do not own. This is definitely true when a child is using a delegate to communicate with a parent. Using a weak reference for the delegate is what the documentation recommends. (But see this, too.)

  • Protocols can be used for both reference types (classes) and value types (structs, enums). So in the likely case that you need to make a delegate weak, you have to make it an object-only protocol. The way to do that is to add AnyObject to the protocol’s inheritance list. (In the past you did this using the class keyword, but AnyObject is preferred now.)

    protocol MyClassDelegate: AnyObject {
        // ...
    }
    
    class SomeClass {
        weak var delegate: MyClassDelegate?
    }
    

Further Study

Reading the following articles is what helped me to understand this much better. They also discuss related issues like the unowned keyword and the strong reference cycles that happen with closures.

Related

Solution 3:

AnyObject is the official way to use a weak reference in Swift.

class MyClass {
    weak var delegate: MyClassDelegate?
}

protocol MyClassDelegate: AnyObject {
}

From Apple:


To prevent strong reference cycles, delegates should be declared as
weak references. For more information about weak references, see
Strong Reference Cycles Between Class Instances. Marking the protocol
as class-only will later allow you to declare that the delegate must
use a weak reference. You mark a protocol as being class-only by
inheriting from AnyObject, as discussed in Class-Only Protocols.

https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/Protocols.html#//apple_ref/doc/uid/TP40014097-CH25-ID276

Solution 4:

Update:
It looks like the manual has been updated and the example I was referring to has been removed. See the edit to @flainez’s answer above.

Original:
Using @objc is the right way to do it even if you’re not interoperating with Obj-C. It ensures that your protocol is being applied to a class and not an enum or struct. See “Checking for Protocol Conformance” in the manual.

Solution 5:

protocol must be subClass of AnyObject, class

example given below

    protocol NameOfProtocol: class {
   // member of protocol
    }
   class ClassName: UIViewController {
      weak var delegate: NameOfProtocol? 
    }

Hope this helps!