在C包装器中获取Objective-C值(Unity插件)

// Objective-C类的定义
@interface MyObject : NSObject
@property (nonatomic, assign) int intValue;
@property (nonatomic, strong) NSString *stringValue;
- (void)doSomething;
@end

// C包装器的定义
extern "C" {
    void* createObject();
    void releaseObject(void* object);
    int getIntValue(void* object);
    const char* getStringValue(void* object);
    void doSomething(void* object);
}

// C包装器的实现
void* createObject() {
    MyObject *obj = [[MyObject alloc] init];
    return (__bridge_retained void*)obj;
}

void releaseObject(void* object) {
    MyObject *obj = (__bridge_transfer MyObject*)object;
    obj = nil;
}

int getIntValue(void* object) {
    MyObject *obj = (__bridge MyObject*)object;
    return obj.intValue;
}

const char* getStringValue(void* object) {
    MyObject *obj = (__bridge MyObject*)object;
    return [obj.stringValue UTF8String];
}

void doSomething(void* object) {
    MyObject *obj = (__bridge MyObject*)object;
    [obj doSomething];
}

[DllImport("__Internal")]
private static extern IntPtr createObject();

[DllImport("__Internal")]
private static extern void releaseObject(IntPtr obj);

[DllImport("__Internal")]
private static extern int getIntValue(IntPtr obj);

[DllImport("__Internal")]
private static extern string getStringValue(IntPtr obj);

[DllImport("__Internal")]
private static extern void doSomething(IntPtr obj);

// 在Unity中使用Objective-C值的示例
void Start() {
    IntPtr obj = createObject();
    int intValue = getIntValue(obj);
    string stringValue = getStringValue(obj);
    doSomething(obj);
    releaseObject(obj);
}