我正在使用 Xcode 4 作为单视图应用程序进行秒表。不过我有一个问题。当毫秒计数时,它们会无限循环。我希望它们达到 9,然后从 0 重新开始。我还希望秒数达到 59,然后回到 0。这是我的 viewcontroller.m 文件中的代码:
- (IBAction)start{
myTicker = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(showActivity) userInfo:nil repeats:YES];
myTicker2 = [NSTimer scheduledTimerWithTimeInterval:.1 target:self selector:@selector(showActivity1) userInfo:nil repeats:YES];
myTicker3 = [NSTimer scheduledTimerWithTimeInterval:60 target:self selector:@selector(showActivity2) userInfo:nil repeats:YES];
}
- (IBAction)stop{
[myTicker invalidate];
[myTicker2 invalidate];
[myTicker3 invalidate];
}
- (IBAction)reset{
time.text = @"00";
time1.text = @"00";
time2.text = @"00";
}
- (void)showActivity{
int currentTime = [time.text intValue];
int newTime = currentTime + 1;
time.text = [NSString stringWithFormat:@"%d", newTime];
}
- (void)showActivity1{
int currentTime1 = [time1.text intValue];
int newTime1 = currentTime1 + 1;
time1.text = [NSString stringWithFormat:@"%d", newTime1];
}
- (void)showActivity2{
int currentTime2 = [time2.text intValue];
int newTime2 = currentTime2 = 1;
time2.text = [NSString stringWithFormat:@"%d", newTime2];
}
这是我在 .h 文件中的代码。
IBOutlet UILabel *time;
IBOutlet UILabel *time1;
IBOutlet UILabel *time2;
NSTimer *myTicker;
NSTimer *myTicker2;
NSTimer *myTicker3;
}
- (IBAction)start;
- (IBAction)stop;
- (IBAction)reset;
- (void)showActivity;
- (void)showActivity1;
- (void)showActivity2;
@end
任何有关如何做到这一点的答案将不胜感激。谢谢。