ios 如何在实例方法中调用类型方法
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How to call Type Methods within an instance method
提问by Chris Marshall
Apple has a nice explanation of Type (Class) Methods, however, their example looks like this:
Apple对 Type (Class) Methods有很好的解释，但是，他们的示例如下所示：
class SomeClass {
class func someTypeMethod() {
// type method implementation goes here
}
}
SomeClass.typeMethod()
I see this exact same example parroted everywhere. My problem is, I need to call my Type Method from within an instance of my class, and that doesn't seem to compute.
我看到这个完全相同的例子到处都是。我的问题是，我需要从我的类的一个实例中调用我的类型方法，这似乎没有计算。
I MUST be doing something wrong, but I noticed that Apple does not yet support Class Properties. I'm wondering if I'm wasting my time.
我一定是做错了什么，但我注意到 Apple 还不支持类属性。我在想我是不是在浪费时间。
I tried this in a playground:
我在操场上试过这个：
class ClassA
{
class func staticMethod() -> String { return "STATIC" }
func dynamicMethod() -> String { return "DYNAMIC" }
func callBoth() -> ( dynamicRet:String, staticRet:String )
{
var dynamicRet:String = self.dynamicMethod()
var staticRet:String = ""
// staticRet = self.class.staticMethod() // Nope
// staticRet = class.staticMethod() // No way, Jose
// staticRet = ClassA.staticMethod(self) // Uh-uh
// staticRet = ClassA.staticMethod(ClassA()) // Nah
// staticRet = self.staticMethod() // You is lame
// staticRet = .staticMethod() // You're kidding, right?
// staticRet = this.staticMethod() // What, are you making this crap up?
// staticRet = staticMethod() // FAIL
return ( dynamicRet:dynamicRet, staticRet:staticRet )
}
}
let instance:ClassA = ClassA()
let test:( dynamicRet:String, staticRet:String ) = instance.callBoth()
Does anyone have a clue for me?
有人对我有线索吗？
回答by Connor
var staticRet:String = ClassA.staticMethod()
This works. It doesn't take any parameters so you don't need to pass in any. You can also get ClassA dynamically like this:
这有效。它不需要任何参数，因此您无需传入任何参数。您还可以像这样动态获取 ClassA：
Swift 2
斯威夫特 2
var staticRet:String = self.dynamicType.staticMethod()
Swift 3
斯威夫特 3
var staticRet:String = type(of:self).staticMethod()
回答by Diogo T
In Swift 3 you can use:
在 Swift 3 中，您可以使用：
let me = type(of: self)
me.staticMethod()
