每秒调用一次函数，持续 10 秒 [英] Call a function once per second for 10 seconds

问题描述

我需要知道如何在总时间内执行操作，我会解释，我需要重复调​​用一个函数 10 秒，然后每隔 1 秒，我尝试使用计时器，但我明白什么是每 10 秒调用一次函数，而不是 10 秒.

I need to know how you can perform an operation for total time, I'll explain, I need to repeat my call to a function for 10 seconds and then just every 1, I tried using a timer, but I understand what's called function EVERY 10sec and not FOR 10 sec.

有人有什么想法吗?

谢谢

推荐答案

我猜你的意思是你想每秒调用一次函数，十秒后停止调用它.我怀疑您可能希望能够更改间隔(每秒一次)和持续时间(10 秒).

I'm guessing you mean that you want to call a function once per second, and stop calling it after ten seconds. And I suspect that you will want to be able to change the interval (once per second) and the duration (10 seconds).

@implementation Example
{
    NSTimer *_timer;
    NSTimeInterval _stopTime;
}

- (void)setTimerWithInterval:(NSTimeInterval)interval duration:(NSTimeInterval)duration
{
    [_timer invalidate];
    _timer = [NSTimer scheduledTimerWithTimeInterval:interval target:self selector:@selector(timerDidFire) userInfo:nil repeats:YES];
    _stopTime = [NSDate timeIntervalSinceReferenceDate] + duration;
}

- (void)timerDidFire
{
    if ([NSDate timeIntervalSinceReferenceDate] >= _stopTime) {
        [_timer invalidate];
        return;
    }
    NSLog(@"hello from the timer!");
}

- (void)dealloc
{
    [_timer invalidate];
    [super dealloc];  // delete this line if using ARC
}

@end

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