这是我的dylib文件：

cppdemofile.cpp

#include "cppdemofile.h"

int add(int a,int b) {
    return a + b;
}

cppdemofile.h

#ifndef __CppDemoLibrary__cppdemofile__
#define __CppDemoLibrary__cppdemofile__

#pragma GCC visibility push(default)

extern "C" int add(int a,int b);

#pragma GCC visibility pop

#endif

编译成dylib并检查：

nm -gU libCppDemoLibrary.dylib
0000000000000f80 T _add

…将libCppDemoLibrary.dylib复制到〜/ lib …

Swift程序：

@IBAction func buttonClick(sender: NSButton) {
    let handle = dlopen("libCppDemoLibrary.dylib",RTLD_NOW)
    if (handle != nil) {
        var sym = dlsym(handle,"add")
        if (sym != nil) {
            let pointer = UnsafeMutablePointer<(CInt,CInt) -> CInt>(sym)

            // When debugging,I'm reaching up to this point...
            // but now,how do I call the 'add' function here???
            // var result = ???

            // label.stringValue = "Total: " + String(result)
        }
    }
}

如何调用add函数？可以使用dylib吗？我应该将这些来源添加到我的快速项目吗？

typedef int(*addFunc)(int,int);

typealias addFunc = @convention(c) (CInt,CInt) -> CInt

let handle = dlopen(path,RTLD_NOW)
if (handle != nil) {
    var sym = dlsym(handle,"add")
    if (sym != nil) {
        let f = unsafeBitCast(sym,addFunc.self)
        let result = f(12,45)
        print(result)
    }
    dlclose(handle)
}

if let handle = dlopen(path,RTLD_NOW) {
    if let sym = dlsym(handle,"add") {
        let f = unsafeBitCast(sym,to: addFunc.self)
        let result = f(12,45)
        print(result)
    }
    dlclose(handle)
}