🅿️protocol
🚧 施工中
Swift ⟩ type ⟩ category ⟩ protocol
A set of requirements, such as methods and properties, that can be adopted (or followed) by a type, such as a class, structure, or enumeration.
When a type adopts a protocol, it provides its own implementation of the protocol requirements, and is said to conform to that protocol.
🇹🇼 中文稱為「規範」或「協定」。
protocol is a declaration.
Protocol Requirements:
methods
initializers
associated types
properties
inherited protocols
// 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 ⟩ Protocols
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