iOS Objective-C这样和CC++进行混编

Posted 2021-04-30 小码编程

ios Objective-C和C、C++混编，最简单的办法是直接将要调用C、C++代码的.m文件改成.mm文件。

1、Objective-C和C混编，如果C方法写在.m文件内部，我们直接调用即可。

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

// C语言函数

int sum(int x, int y)

{

    return x + y;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    // 调用C函数

    int sumValue = sum(1, 2);

    NSLog(@"sumValue = %d", sumValue);

}

@end

2、Objective-C和C++混编，这里有一个C++类，Caculator计算器类，它实现了一个减法。
Caculator.hpp

#ifndef Caculator_hpp

#define Caculator_hpp

#include <stdio.h>

class Caculator

{

public:

    int sub(int x, int y);

};

#endif /* Caculator_hpp */

Caculator.cpp

#include "Caculator.hpp"

int Caculator::sub(int x, int y)

{

    return x - y;

}

ViewController.mm里，引入Caculator.hpp头文件，调用C++类

#import "ViewController.h"

#include "Caculator.hpp"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    // 调用C++ 类

    Caculator caculator;

    int subValue = caculator.sub(10, 2);

    NSLog(@"subValue = %d", subValue);

}

@end