在两个viewcontroller之间的delegation有问题

Question

第一个viewcontroller是排行榜菜单，里面有一个按钮指示到第二个viewcontroller中,第二个是小游戏，如果玩家输了，最高分变动，就更新排行榜。在玩家完成游戏时建了带两个按钮的UIAlertView，一个是主菜单，另一个是重新开始，我的代码如下：我想通过delegation更新排行榜

  @protocol highScoreProtocol <NSObject>

        -(void)updateHighScore:(int) score;


        @end

        @interface ViewController : UIViewController <UIAlertViewDelegate> 
        @property (nonatomic) int score;
        @property (nonatomic, weak) id <highScoreProtocol> delegateHighScore;
        @implementation ViewController
        @synthesize score=_score;
        @synthesize delegateHighScore=_delegateHighScore;

            -(void)lostGame{
            [self.delegateHighScore updateHighScore:self.score]; 

        UIAlertView *losingScreen=[[UIAlertView alloc]initWithTitle:@"Game Over" message:[NSString stringWithFormat:@"Your Score Is %d", self.score] delegate:self cancelButtonTitle:@"Main Menu" otherButtonTitles:@"Restart", nil]; 
            }

        -(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
              if (buttonIndex==0) {


            } else if (buttonIndex==1){

            }
        }

    @end

            @interface MenuVC : UIViewController <highScoreProtocol>
            @property (weak, nonatomic) IBOutlet UILabel *labelHighScore;
    @end


@implementation MenuVC

- (void)viewDidLoad
{
    [super viewDidLoad];
    ViewController *vc=[[ViewController alloc]init];
    vc.delegateHighScore=self;

}

-(void)updateHighScore:(int)score{
    if (score>[self.labelHighScore.text integerValue]) { 
        self.labelHighScore.text=[NSString stringWithFormat:@"%d", score];
    }
    NSLog(@"does this method even run");


}

不知道哪出错了，希望大家帮忙。

Answer 1

这行代码不对

ViewController *vc=[[ViewController alloc]init];
vc.delegateHighScore=self;

定义了一个新的不相干的viewcontroller。

如果你的情况是这样：定义一个viewcontroller的identifier，选择viewcontroller，……

然后用这行代码：

ViewController *vc = [self.storyboard instantiateViewControllerWithIdentifier:@"yourIdentifier"];
vc.delegateHighScore = self;