関数のInvokeによるCFunctionPointer使う

InvokeFunction.h

#include <stdio.h>

int invoke_fun(int (*f)(void));

#endif /* defined(__LiveCyalume__InvokeFunction__) */

InvokeFunction.c

#include "InvokeFunction.h"


int invoke_fun(int (*f)(void)) {
    return f();
}

{ProjectName}-Bridging-Header.h

int invoke_fun(int (*f)(void));

ViewController.swift

let handle = dlopen("/usr/lib/libc.dylib", RTLD_NOW)
let sym : UnsafeMutablePointer<Void> = dlsym(handle, "random")
let rawPointer = UnsafeMutablePointer<() -> Int32>(sym)
let opaquePtr : COpaquePointer = COpaquePointer(rawPointer)
let cFunPointer  = CFunctionPointer<() -> Int32>(opaquePtr)
println(invoke_fun(cFunPointer))

ただし、RetrunタイプがObjectの場合には使えない。