NStimer 和 for 循环

发布于 2024-10-18 03:58:46 字数 569 浏览 2 评论 0原文

我正在为此苦苦挣扎。我看到一些代码可以执行此操作：

- (void)startTimer {
    pauseTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(doActions) userInfo:nil repeats:YES];
}

然后在 doActions 中调用它。

问题是我想在按下按钮时调用它，并且执行操作是一个IBaction。我不断收到 sigAbrt。

有人可以给我一些示例代码，您可以在按下按钮时每 1 秒将标签从“开”更改为“关”吗？

编辑

我的意思是如果 doActions 看起来像这样

- (IBAction) doActions {
for(int j; j<100; j++){

theLabel.hidden != theLabel.hidden;
//Does invalidate timer go here?
}
}

原文

I'm struggling with this. I saw some code where you can do this :

- (void)startTimer {
    pauseTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(doActions) userInfo:nil repeats:YES];
}

Then call it in doActions.

Problem is i want to call it while a button is being pressed, and do actions is an IBaction. I keep getting a sigAbrt.

Can someone give me some sample code where you cay change a label from 'on' to 'off' every 1 second while a button is being pressed?

EDIT

i mean if doActions looks like this

- (IBAction) doActions {
for(int j; j<100; j++){

theLabel.hidden != theLabel.hidden;
//Does invalidate timer go here?
}
}

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一页 2024-10-25 03:58:46

我仍然不清楚你想要实现什么：毕竟，如果你只是用简单的英语写下来的话，我会发现它会容易得多。

也就是说，我认为这将帮助您到达您想去的地方：

// Assuming ivars:
// NSTimer* toggleTimer
// NSUInteger toggleCount

- (void)toggleTimerFired:(NSTimer*)timer
{
  if ( toggleCount++ >= 100 ) {
    [self stopToggling:self];
    return;
  }
  // do whatever you need to do a hundred times here
}

- (IBAction)stopToggling:(id)sender
{
  [toggleTimer invalidate], toggleTimer = nil;  // you don't want dangling pointers...
  // perform any other needed house-keeping here
}

- (IBAction)startToggling:(id)sender
{
  [self stopToggling:self]; // if `startToggling:` will NEVER be called when a timer exists, this line CAN be omitted.
  toggleCount = 0;
  toggleTimer = [NSTimer scheduledTimerWithTimeInterval:1. target:self selector:@selector(toggleTimerFired:) userInfo:nil repeats:YES];
}

根据您想要执行的操作，startToggling: 需要在 touchUpInside 或 touchDown 上发送。在第二种情况下，可能需要在按钮的任何 touchUp... 事件上调用 stopToggling:。

It still isn't clear to me, what you're trying to accomplish: I would have found it much easier, if you simply had it written down in plain english, after all.

That said, here's what I think will get you where you want to go:

// Assuming ivars:
// NSTimer* toggleTimer
// NSUInteger toggleCount

- (void)toggleTimerFired:(NSTimer*)timer
{
  if ( toggleCount++ >= 100 ) {
    [self stopToggling:self];
    return;
  }
  // do whatever you need to do a hundred times here
}

- (IBAction)stopToggling:(id)sender
{
  [toggleTimer invalidate], toggleTimer = nil;  // you don't want dangling pointers...
  // perform any other needed house-keeping here
}

- (IBAction)startToggling:(id)sender
{
  [self stopToggling:self]; // if `startToggling:` will NEVER be called when a timer exists, this line CAN be omitted.
  toggleCount = 0;
  toggleTimer = [NSTimer scheduledTimerWithTimeInterval:1. target:self selector:@selector(toggleTimerFired:) userInfo:nil repeats:YES];
}

Depending on what exactly you want to do, startToggling: needs to be sent on either touchUpInside or touchDown. In the second case, stopToggling: probably needs to be called on any touchUp... event of the button.

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累赘 2024-10-25 03:58:46

- (void)startTimer {
    pauseTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(doActions) userInfo:nil repeats:YES];
} 

- (void) doActions {
theLabel.hidden != theLabel.hidden;
}

- (void)startTimer {
    pauseTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(doActions) userInfo:nil repeats:YES];
} 

- (void) doActions {
theLabel.hidden != theLabel.hidden;
}

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