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Swift Call C

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如何在swift调整c代码呢？

swift通过工程的桥接文件，调用oc或c的相关代码!!!

1.创建c文件：test.h和test.c

test.h内容如下：

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#ifndef test_h
#define test_h

#include <stdio.h>

void showValue(int *value);

#endif /* test_h */

test.c内容如下

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#include "test.h"

void showValue(int *value) {
    printf("old value = %d\n",*value);
    *value = *value + 1;
    printf("new value = %d\n",*value);
}

2.在桥接文件中,加入test.h引用：#include "test.h"

3.swift中调用

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   var value: Int32 = 0
   showValue(&value)

结果显而易见：

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old value = 0
new value = 1

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