Swift类中的静态vs类函数/变量？ [英] Static vs class functions/variables in Swift classes?

问题描述

下面的代码在Swift 1.2中编译：

The following code compiles in Swift 1.2:

class myClass {
    static func myMethod1() {
    }
    class func myMethod2() {
    }
    static var myVar1 = ""
}

func doSomething() {
    myClass.myMethod1()
    myClass.myMethod2()
    myClass.myVar1 = "abc"
}

静态函数和类函数之间有什么区别？我应该使用哪一个，何时？

What is the difference between a static function and a class function? Which one should I use, and when?

如果我尝试定义另一个变量 class var myVar2 = ，它说：

If I try to define another variable class var myVar2 = "", it says:

类中还不支持类存储的属性;

Class stored properties not yet supported in classes; did you mean 'static'?

当支持此功能时，静态变量和类变量（即两者都在类中定义）？我应该使用哪一个，以及何时？

When this feature is supported, what will the difference be between a static variable and a class variable (i.e. when both are defined in a class)? Which one should I use, and when?

（Xcode 6.3）

(Xcode 6.3)

推荐答案

static 和 class 都将方法与类关联，而不是类的实例。区别是子类可以覆盖 class 方法;它们不能覆盖 static 方法。

static and class both associate a method with a class, rather than an instance of a class. The difference is that subclasses can override class methods; they cannot override static methods.

类理论上函数以相同的方式（子类可以覆盖它们），但是它们在Swift中是不可能的。

class properties will theoretically function in the same way (subclasses can override them), but they're not possible in Swift yet.

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