用户返回上一视图时如何停止计时器

本文介绍了用户返回上一视图时如何停止计时器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我的计时器有问题.在 viewDidLoad 的游戏视图中，我有:

sixtySecondTimer = [NSTimercheduledTimerWithTimeInterval:(1.0/1.0)目标:自我选择器:@selector(changeValue)userInfo:无重复:是]；

接下来我有changeValue方法:

-(无效)changeValue {timerInt + = 1;NSLog(@"TimerInt2 =％d"，timerInt);NSString * string = [NSString stringWithFormat:@％d"，timerInt];labelTimer.text =字符串;}

然后使用以下命令转到上一个视图:

-(IBAction)backView:(id)sender {timerInt = 0;[self.navigationController popViewControllerAnimated:YES];}

当我在命令行中的上一个视图中时，可以看到:

2012-02-13 10:04:33.393 Colores [1240:707] TimerInt2 = 12012-02-13 10:04:34.393 Colores [1240:707] TimerInt2 = 22012-02-13 10:04:35.393 Colores [1240:707] TimerInt2 = 3

当我在命令行中进入游戏视图时，我可以看到以下内容:

2012-02-13 10:04:36.393 Colores [1240:707] TimerInt2 = 42012-02-13 10:04:36.508 Colores [1240:707] TimerInt2 = 12012-02-13 10:04:37.393 Colores [1240:707] TimerInt2 = 52012-02-13 10:04:37.508 Colores [1240:707] TimerInt2 = 22012-02-13 10:04:38.393 Colores [1240:707] TimerInt2 = 62012-02-13 10:04:38.508 Colores [1240:707] TimerInt2 = 3

问题是我的计时器没有停止，当我再次进入游戏视图时，请创建新"变量timerInt ...当我再次回到上一个视图并再次进入游戏视图时，我会有三个timerInt变量./p>

我该如何解决?

解决方案

-(IBAction)backView:(id)sender {如果([sixtySecondTimer isValid]){[sixtySecondTimer无效]；timerInt = 0;[self.navigationController popViewControllerAnimated:YES];}

将 invalidate 发送到计时器可阻止其再次触发

I have problem with my timer. In my game view in viewDidLoad I have:

sixtySecondTimer = [NSTimer scheduledTimerWithTimeInterval:(1.0/1.0) target:self selector:@selector(changeValue) userInfo:nil repeats:YES];

Next I have changeValue method:

- (void) changeValue { timerInt += 1; NSLog(@"TimerInt2 = %d", timerInt); NSString *string = [NSString stringWithFormat:@"%d", timerInt]; labelTimer.text = string; }

And I go to previous view using:

- (IBAction)backView:(id)sender { timerInt = 0; [self.navigationController popViewControllerAnimated:YES]; }

When I am in previous view in command line I can see:

2012-02-13 10:04:33.393 Colores[1240:707] TimerInt2 = 1 2012-02-13 10:04:34.393 Colores[1240:707] TimerInt2 = 2 2012-02-13 10:04:35.393 Colores[1240:707] TimerInt2 = 3

And when I go to game view in command line I can see this:

2012-02-13 10:04:36.393 Colores[1240:707] TimerInt2 = 4 2012-02-13 10:04:36.508 Colores[1240:707] TimerInt2 = 1 2012-02-13 10:04:37.393 Colores[1240:707] TimerInt2 = 5 2012-02-13 10:04:37.508 Colores[1240:707] TimerInt2 = 2 2012-02-13 10:04:38.393 Colores[1240:707] TimerInt2 = 6 2012-02-13 10:04:38.508 Colores[1240:707] TimerInt2 = 3

Problem is that my timer don't stop and when I go again to game view create "new" variable timerInt... When I go again to previous view and again go to game view then I have three timerInt variable.

How can I fix it?

解决方案

- (IBAction)backView:(id)sender { if ([sixtySecondTimer isValid]) { [sixtySecondTimer invalidate]; timerInt = 0; [self.navigationController popViewControllerAnimated:YES]; }

sending invalidate to a timer stops it from firing again