I know that static keyword is used to declare type variable/method in struct, enum etc.
But today I found it can also be used in class entity.
class foo {
static func hi() {
println("hi")
}
class func hello() {
println("hello")
}
}
What's static keyword's use in class entity?
Thanks!
edit: I'm referring to Swift 1.2 if that makes any difference
From the Xcode 3 beta 3 release notes:
“static” methods and properties are now allowed in classes (as an alias for “class final”).
So in Swift 1.2, hi() defined as
class foo {
static func hi() {
println("hi")
}
}
is a type method (i.e. a method that is called on the type itself) which also is final (i.e. cannot be overridden in a subclass).
In classes it's used for exactly the same purpose. However before Swift 1.2 (currently in beta) static was not available - the alternate class specifier was been made available for declaring static methods and computed properties, but not stored properties.
In Swift 5, I use type(of: self) to access class properties dynamically:
class NetworkManager {
private static var _maximumActiveRequests = 4
class var maximumActiveRequests: Int {
return _maximumActiveRequests
}
func printDebugData() {
print("Maximum network requests: \(type(of: self).maximumActiveRequests).")
}
}
class ThrottledNetworkManager: NetworkManager {
private static var _maximumActiveRequests = 2
override class var maximumActiveRequests: Int {
return _maximumActiveRequests
}
}
ThrottledNetworkManager().printDebugData()
Prints 2.
In Swift 5.1, we should be able to use Self, with a capital S, instead of type(of:).
