NSTimer 变得更快
我正在尝试使用计时器来跟踪游戏中的时间。这是计时器的代码。为什么每次我从主菜单重新启动游戏时，计时器都会快两倍。是因为我在退出之前没有使计时器失效吗？我试图使计时器无效，但它只是给出了错误 exc_bad access
-(void) StartTimer {
TotalSeconds = 0;
GameCenterTotalSeconds = 0;
timeSec = 0;
timeMin = 0;
timer = [[NSTimer scheduledTimerWithTimeInterval:.1 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES]retain];
//[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
}
//Event called every time the NSTimer ticks.
- (void)timerTick:(NSTimer*) timer {
TotalSeconds++;
GameCenterTotalSeconds= GameCenterTotalSeconds + .1;
timeSec = timeSec + .1;
if (timeSec >= 60)
{
timeSec = 00;
timeMin++;
}
//Format the string 00:00
NSString* timeNow = [NSString stringWithFormat:@"Time: %02d:%.1f", timeMin, timeSec];
//Display on your label
timeLabel.text = timeNow;
}
//Call this to stop the timer event(could use as a 'Pause' or 'Reset')
- (void) StopTimer {
[timer invalidate];
//Since we reset here, and timerTick won't update your label again, we need to refresh it again.
//Format the string in 00:00
NSString* timeNow = [NSString stringWithFormat:@"%02d:%02d", timeMin, timeSec];
//Display on your label
timeLabel.text = timeNow;
}
I am trying to use to timer to keep track of a time in a game. Here is the code for the timer. How come every time I relaunch the game from the main menu the timer gets almost twice as fast. Is it because i am not invalidating the timer before I quit. I tried to invalidate the timer but it just gives the error exc_bad access
-(void) StartTimer {
TotalSeconds = 0;
GameCenterTotalSeconds = 0;
timeSec = 0;
timeMin = 0;
timer = [[NSTimer scheduledTimerWithTimeInterval:.1 target:self selector:@selector(timerTick:) userInfo:nil repeats:YES]retain];
//[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
}
//Event called every time the NSTimer ticks.
- (void)timerTick:(NSTimer*) timer {
TotalSeconds++;
GameCenterTotalSeconds= GameCenterTotalSeconds + .1;
timeSec = timeSec + .1;
if (timeSec >= 60)
{
timeSec = 00;
timeMin++;
}
//Format the string 00:00
NSString* timeNow = [NSString stringWithFormat:@"Time: %02d:%.1f", timeMin, timeSec];
//Display on your label
timeLabel.text = timeNow;
}
//Call this to stop the timer event(could use as a 'Pause' or 'Reset')
- (void) StopTimer {
[timer invalidate];
//Since we reset here, and timerTick won't update your label again, we need to refresh it again.
//Format the string in 00:00
NSString* timeNow = [NSString stringWithFormat:@"%02d:%02d", timeMin, timeSec];
//Display on your label
timeLabel.text = timeNow;
}
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如果您在退出之前没有使计时器无效，那么下次启动时您将创建第二个计时器，因此事件触发的频率是原来的两倍。
If you don't invalidate the timer before you exit, the next time you start you are creating a second timer, so events are firing twice as often.
只是使计时器无效，然后创建一个新的更快的计时器
just invalidate the timer, and create a new faster one