Swift Class Methods
Swift Class Methods
Use static or class to define type methods that belong to the type itself rather than an instance.
Type Methods
Use class for overridable type methods; static methods cannot be overridden.
Example
class Math {
class func square(_ n: Int) -> Int { n * n } // overridable in subclasses
static func cube(_ n: Int) -> Int { n * n * n } // not overridable
}
print(Math.square(4))
print(Math.cube(3))Override class func
Use class for overridable type methods; static methods cannot be overridden.
Example
class Base {
class func greet() { print("Base") }
static func ping() { print("Base ping") }
}
class Sub: Base {
override class func greet() { print("Sub") }
// static func cannot be overridden
}
Base.greet()
Sub.greet()
Base.ping()
