swift中的匿名类 [英] Anonymous class in swift

问题描述

Swift 中的匿名类是否有等效的语法或技术?只是为了澄清 Java 示例中的匿名类 - http://docs.oracle.com/javase/教程/java/javaOO/anonymousclasses.html

Is there an equivalent syntax or technique for Anonymous class in Swift? Just for clarification Anonymous class in Java example here - http://docs.oracle.com/javase/tutorial/java/javaOO/anonymousclasses.html

谢谢！

推荐答案

据我所知，没有等效的语法.

There is no equivalent syntax, as far as I know.

关于等效技术，理论上您可以使用闭包并在其中定义结构和类.可悲的是，我无法让它在操场或项目中工作而不使其崩溃.这很可能还没有准备好在当前的测试版中使用.

Regarding equivalent techniques, theoretically you could use closures and define structs and classes inside them. Sadly, I can't get this to work in a playground or project without making it crash. Most likely this isn't ready to be used in the current beta.

有点像……

protocol SomeProtocol {
    func hello()
}

let closure : () -> () = {
    class NotSoAnonymousClass : SomeProtocol {
        func hello() {
            println("Hello")
        }
    }
    let object = NotSoAnonymousClass()
    object.hello()
}

...当前输出此错误:

...currently outputs this error:

invalid linkage type for global declaration
%swift.full_heapmetadata* @_TMdCFIv4Test7closureFT_T_iU_FT_T_L_19NotSoAnonymousClass
LLVM ERROR: Broken module found, compilation aborted!
Command /Applications/Xcode6-Beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift failed with exit code 1

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