如何在Swift中調用IMP？

Question

由於Swift2你可以用良好的OLE'：

class_getMethodImplementation(cls: AnyClass!, _ name: Selector) -> IMP 

它返回imp。在Objective-C你只需要調用它像：

implementation(self, selector) 

但如何調用它斯威夫特？

Answer 1

基於文章Instance Methods are Curried Functions in Swift它是很容易達到預期的效果：

typealias MyCFunction = @convention(c) (AnyObject, Selector) -> Void 
let curriedImplementation = unsafeBitCast(implementation, MyCFunction.self) 
curriedImplementation(self, selector) 

Answer 2

我試圖讓運行時調用的實例方法與參數（S）工作。 @法比奧的回答讓我獲得了大部分途徑。以下是未來Google的完整示例：

import Foundation 

class X { 
    @objc func sayHiTo(name: String) { 
    print("Hello \(name)!") 
    } 
} 

let obj = X() 
let sel = #selector(obj.sayHiTo) 
let meth = class_getInstanceMethod(object_getClass(obj), sel) 
let imp = method_getImplementation(meth) 

typealias ClosureType = @convention(c) (AnyObject, Selector, String) -> Void 
let sayHiTo : ClosureType = unsafeBitCast(imp, ClosureType.self) 
sayHiTo(obj, sel, "Fabio") 
// prints "Hello Fabio!"