我在想是否可能从C++调用Swift函数?如果可以,怎么做呢?我知道我们可以从Swift调用C++函数,但我还没有找到关于这个问题的确切答案。
// main.swift
private func printGreeting(modifier: UnsafePointer<CChar>) {
print("Hello \(String(cString: modifier))World!")
}
var callbacks = SomeCLibCallbacks(
printGreeting: { (modifier) in
printGreeting(modifier: modifier)
}
)
SomeCLibSetup(&callbacks)
SomeCLibTest()
// SomeCLib.h
#ifndef SomeCLib_h
#define SomeCLib_h
struct SomeCLibCallbacks {
void (* _Nonnull printGreeting)(const char * _Nonnull modifier);
};
typedef struct SomeCLibCallbacks SomeCLibCallbacks;
extern void SomeCLibSetup(const SomeCLibCallbacks * _Nonnull callbacks);
extern void SomeCLibTest(void);
#endif
// SomeCLib.c
#include "SomeCLib.h"
static SomeCLibCallbacks sCallbacks;
extern void SomeCLibSetup(const SomeCLibCallbacks * callbacks) {
sCallbacks = *callbacks;
}
extern void SomeCLibTest(void) {
sCallbacks.printGreeting("Cruel ");
}
来源:https://forums.swift.org/t/best-way-to-call-a-swift-function-from-c/9829/2