ios - 如何在 swift 中对对象实例使用选择器

Question

正如我们所知，string 对象具有uppercased、lowercased、capitalise 等方法。

我想在运行时调用选择器。例如:

let aSelector = Selector("capitalise")

let str = "Good Morning"
//now i want to apply aSelector on str:
let finalString = str.aSelector

我怎样才能实现它？谢谢。

Answer 1

I have two constants file for two target. In these files i want to define selector let's say capitalise and uppercase. Now in my code which is common to both targets, I have a string it can be capitalise or uppercase, without any if else. ex : str.thatSelectorInMyConstantFile

如何使用闭包:

let stringOp = { (str: String) in str.capitalized }

或

let stringOp = { (str: String) in str.uppercased() }

然后你会像这样使用它:

let str = "hello world"
let finalString = stringOp(str)
print(finalString)

输出:

Hello World

或

HELLO WORLD