（iPhone）重复时我是否需要使计时器无效：不需要？

发布于 2024-10-20 06:33:20 字数 302 浏览 5 评论 0原文

[NSTimer scheduledTimerWithTimeInterval: target: selector: userInfo: repeats:NO];

当repeats:设置为NO时，我是否需要使指定选择器内的计时器无效？

谢谢

编辑

另一个问题，如果它自行失效，

如何正确取消这样的计时器？
因为使已经无效的计时器无效我认为会崩溃？

维护一个指向计时器的指针并将其设置为 nil 在将被触发的选择器中？

原文

[NSTimer scheduledTimerWithTimeInterval: target: selector: userInfo: repeats:NO];

When repeats: is set to NO, do I need to invalidate the timer inside the specified selector?

Thank you

Edit

Another question, if it self invalidates,

How do you properly cancel a such timer?
Since invalidating already-invalidated timer would crash I assume?

maintain a pointer to the timer and set it to nil inside the selector that will get fired?

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香橙ぽ 2024-10-27 06:33:20

不，计时器会自行失效

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梦毁影碎の 2024-10-27 06:33:20

@Eugene，如果您在选择器方法中使用

[NSTimer scheduledTimerWithTimeInterval: target: selector: userInfo: repeats:YES];

then ，您需要提供一个像这样的函数

- (void)timerFireMethod:(NSTimer*)theTimer

，这样当您想要使其无效时，您可以有一个像这样的条件

if(workDone == YES)
{
   [theTimer invalidate];
}

但是如果您在重复选项，则计时器将自行失效。

@Eugene if you are using

[NSTimer scheduledTimerWithTimeInterval: target: selector: userInfo: repeats:YES];

then in the selector method you need to give a function like this one

- (void)timerFireMethod:(NSTimer*)theTimer

so when you want to invalidate it you can have a condition like this one

if(workDone == YES)
{
   [theTimer invalidate];
}

But if you are using NO in the repeat option then the timer will invalidate itself.

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回忆凄美了谁 2024-10-27 06:33:20

您可以维护标志来保存计时器是否已被触发。

例如。

    BOOL gameOver = NO;
    NSTimer * gameOverTimer;


-(void)startGame
{

     gameOverTimer =    [NSTimer scheduledTimerWithTimeInterval:600 target:self selector:@selector(stopLevel:) userInfo:nil repeats:NO]; 
     // your code
}

-(void)stopLevel:(id)sender
{
     gameOver = YES;
     // your code
}

-(void)levelFinishedSuccesfully
{
     // this method will get called if user finishes the level before your timer ends/stops the level. So the timer is valid and we need to invalidate it
     if(!gameOver)
     {
          [gameOverTimer invalidate];
          gameOverTimer = nil;
     }    
      // your code
}

希望这有帮助。

You can maintain flag to save whether the timer has been fired or not.

eg.

    BOOL gameOver = NO;
    NSTimer * gameOverTimer;


-(void)startGame
{

     gameOverTimer =    [NSTimer scheduledTimerWithTimeInterval:600 target:self selector:@selector(stopLevel:) userInfo:nil repeats:NO]; 
     // your code
}

-(void)stopLevel:(id)sender
{
     gameOver = YES;
     // your code
}

-(void)levelFinishedSuccesfully
{
     // this method will get called if user finishes the level before your timer ends/stops the level. So the timer is valid and we need to invalidate it
     if(!gameOver)
     {
          [gameOverTimer invalidate];
          gameOverTimer = nil;
     }    
      // your code
}

Hope this helps.

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