Question

我想向用户显示他或她将一定数量的问题（例如5）作为警报回答了多长时间。我相信我有正确的计时器，虽然我可能是错的。我将如何完成编码？

- (void)updateCounter:(NSTimer *)theTimer {
static int count = 0;
count += 1;
NSString *s = [[NSString alloc]
               initWithFormat:@"%d", count];
self.timer.text = s;
[s release];
}

- (void)generate
{
int a = 1 + arc4random() % 12;
int b = 1 + arc4random() % 12;

int sum = a * b;

label.text = [NSString stringWithFormat: @"%d * %d = ", a, b];

label.tag = sum;
}
- (void)viewDidLoad
{NSLog(@"viewDidLoad");
[super viewDidLoad];

[self generate];

[self.answer becomeFirstResponder];

UIAlertView *alert;
{alert = [[UIAlertView alloc]
          initWithTitle:@"Welcome to iCanMultiply!" 
          message:@"Tap 'Start' to start the game" 
          delegate: self
          cancelButtonTitle:@"Start" 
          otherButtonTitles: nil];
}

[alert show];
[alert release];

[NSTimer scheduledTimerWithTimeInterval:1.0f
                                 target:self
                               selector:@selector(updateCounter:)
                               userInfo:nil
                                repeats:YES];
}
- (IBAction)submit:(id)sender {
int num = [answer.text intValue];

UIAlertView *alert;
if (num == label.tag)

{ 
    // answer was correct
    alert = [[UIAlertView alloc]
             initWithTitle:@"Correct"
             message:@"Bet you can't do that twice!"
             delegate:self
             cancelButtonTitle:@"Next Question"
             otherButtonTitles: nil];

    // use the alert tag to mark that answer was correct
    alert.tag = 1;
} else 
{
    // answer is incorrect
    alert = [[UIAlertView alloc] 
             initWithTitle:@"Wrong!" 
             message:@"Sorry, try again..."
             delegate:self 
             cancelButtonTitle:@"Try Again" 
             otherButtonTitles: nil];
}

// show and release the alert
[alert show];
[alert release];
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (alertView.tag == 1)
{
    [self generate];

    answer.text = @"";
}
}

Answer 1

存储该值，然后将其显示在警报视图中。

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title" message@"It took you %@ seconds.",time delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];

[alert show];
[alert release];

让我知道时间是否有效。我还没有测试过，但它应该可以工作。

如何显示警告显示在xcode中完成一定数量的问题需要多长时间？

1 个答案: