cocos2d-iphone - 为分数制作增量计数器

Question

我怎样才能制作一个计数器，它将在两秒内从零递增（运行）到获得的分数？我打算用它来显示游戏中的最终分数。我不太确定该怎么做。请帮忙。

Answer 1

我个人不知道 cocos2d 以及它如何显示文本或使用计时器，但这里是如何使用纯 iOS SDK 做到这一点。如果你知道 cocos2d，转换它应该不是问题。

- (void)viewDidLoad
{
    [super viewDidLoad];
    highScoreLabel = [[UILabel alloc] initWithFrame:CGRectMake(100.0, 100.0, 200.0, 75.0)];
    [self displayHighScore];
}

-(void)displayHighScore {
    highScore = 140;
    currentValue = 0;

    NSString* currentString = [NSString stringWithFormat:@"%d", currentValue];
    [highScoreLabel setText:currentString];
    [self.view addSubview:highScoreLabel];

    int desiredSeconds = 2; //you said you want to accomplish this in 2 seconds
    [NSTimer scheduledTimerWithTimeInterval: (desiredSeconds/highScore) // this allow the updating within the 2 second range
                                     target: self
                                   selector: @selector(updateScore:)
                                   userInfo: nil
                                    repeats: YES];
}

-(void)updateScore:(NSTimer*)timer {
    currentValue++;

    NSString* currentString = [NSString stringWithFormat:@"%d", currentValue];
    [highScoreLabel setText:currentString];

    if (currentValue == highScore) {
        [timer invalidate]; //stop the timer because it hit the same value as high score
    }
}

Answer 2

以下是可用于根据给定值设置动画（使用调度程序）的代码：

float secs = 2.0f;
float deciSecond = 1 / 10;
newScore = 100;

currentScore = 0;
scoreInDeciSecond = (newScore / secs) * deciSecond;
[self schedule:@selector(counterAnimation) interval:deciSecond];

这就是您的方法将如何处理动画：

- (void)counterAnimation {
   currentScore += scoreInDeciSecond;
   if (currentScore >= newScore) {
      currentScore = newScore;
      [self unschedule:@selector(counterAnimation)];
   }
   scoreLabel.string = [NSString stringWithFormat:@"%d", currentScore];
}