Menu
Class (or static) methods in Objective-C were accomplished using + in declarations.
@interface MyClass : NSObject + (void)aClassMethod; - (void)anInstanceMethod; @end How can this be achieved in Swift?
936
Type methods for 'classes' are defined by the 'func' keyword and structures and enumerations type methods are defined with the 'static' keyword before the 'func' keyword. Type methods are called and accessed by '. ' syntax where instead of calling a particular instance the whole method is invoked.
In Swift, you can define type-level methods for all classes, structures, and enumerations. Each type method is explicitly scoped to the type it supports. Type methods are called with dot syntax, like instance methods.
A Swift function defined inside a class is called method. For example, class Person { . . . // define methods func greet() { // method body } } Here, greet() is a method defined inside the Person class. Before you learn about methods, make sure you know the working of class and struct in Swift.
A Swift variable or constant defined inside a class or struct are called properties. For example, class Person { // define properties var name: String = "" var age: Int = 0 ... } Here, inside the Person class we have defined two properties: name - of String type with default value ""
They are called type properties and type methods and you use the class or static keywords.
class Foo { var name: String? // instance property static var all = [Foo]() // static type property class var comp: Int { // computed type property return 42 } class func alert() { // type method print("There are \(all.count) foos") } } Foo.alert() // There are 0 foos let f = Foo() Foo.all.append(f) Foo.alert() // There are 1 foos If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
