如何在Swift中调用IMP？

Question

从Swift2开始,你可以使用好的''

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

它回来了imp.在Objective-C你只需要调用它像:

implementation(self, selector)

但是如何在Swift中调用它？

Answer 1

基于文章Instance Methods is Curried Functions in Swift,很容易实现所需的结果:

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

Answer 2

我试图让带有参数的实例方法进行运行时调用.@ Fabio的回答让我大部分都在那里.以下是未来googlers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!"