protocol | ios.dev

protocol is a declaration.

Protocol Requirements:

methods
initializers
associated types
properties
inherited protocols

Any is an empty protocol and everything implicitly conforms to this protocol. 👉

// Some code
protocol SomeProtocol {

    // -----------------------------
    //     Property Requirements
    // -----------------------------
    // • can be stored/computed property
    
    // ⭐ gettable
    // can’t be fulfilled by a constant stored property 
    // or a read-only computed property.
    var mustBeSettable: Int { get set }
    
    // ⭐ settable
    // satisfied by any kind of property
    var doesNotNeedToBeSettable: Int { get }
    
    // ⭐ type property
    static var typeProperty: Int { get set }
    
    // -----------------------------
    //     Method Requirements
    // -----------------------------
    
    func method() -> Double         // ⭐ instance method
    static func typeMethod()        // ⭐ type method
    mutating func toggle()          // ⭐ mutating method
    
    // -----------------------------
    //     Init Requirements
    // -----------------------------
    
    init(someParameter: Int)
}

Swift ⟩