我想在我的 ViewController 中调用 c++ 类。所以我创建了一个这样的类：Hello.h
#import <Foundation/Foundation.h>
@interface Hello : NSObject{
class NewHello{
private:int greeting_text;
public:
NewHello(){
greeting_text=5;
}
void say_hello(){
printf("Greeting_Text = %d",greeting_text);
}
};
NewHello *hello;
}
-(void)sayHellooooo;
@end
你好.mm
#import "Hello.h"
@implementation Hello
-(void)sayHellooooo{
hello = new NewHello();
hello->say_hello();
}
@end
视图控制器.h
#import <UIKit/UIKit.h>
//#include "Hello.h"
@class Hello;
@interface ViewController : UIViewController{
}
@end
视图控制器.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(@"dddddddd");
Hello *aa = [[Hello alloc]init];
[aa sayHellooooo];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end
在项目中运行良好：http: //files.cnblogs.com/cpcpc/Objective-C%E8%B0%83%E7%94%A8C.rar
但是当我将代码复制到我的项目时，会出现“接收器类型例如消息是前向声明”错误。
如果我更改“@class Hello;” 到#import "Hello.h"，在"class NewHello"中出现"Unkwon type class,did you mean Class"错误。
我使用 xcode 4.6。有人可以帮助我吗？谢谢！