每次运行时减少 NSTimer 间隔

发布于 2024-12-11 22:05:16 字数 402 浏览 0 评论 0原文

我希望我的 NSTimer 每次运行时都能加速：

-(void)runtimer {
   int delay = delay - 1;
   [NSTimer scheduledTimerWithTimeInterval:(delay) 
                                    target:self 
                                  selector:@selector(timerTriggered:) 
                                  userInfo:nil 
                                   repeats:YES];

}

但这不起作用。怎样才能让延迟越来越小呢？

原文

I want my NSTimer to speed up each time it's run:

-(void)runtimer {
   int delay = delay - 1;
   [NSTimer scheduledTimerWithTimeInterval:(delay) 
                                    target:self 
                                  selector:@selector(timerTriggered:) 
                                  userInfo:nil 
                                   repeats:YES];

}

But this doesn't work. How can I make the delay keep getting smaller and smaller?

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城歌 2024-12-18 22:05:16

我自己需要这个并编写了一个组件CPAccelerationTimer (Github)：

[[CPAccelerationTimer accelerationTimerWithTicks:20
    totalDuration:10.0
    controlPoint1:CGPointMake(0.5, 0.0) // ease in
    controlPoint2:CGPointMake(1.0, 1.0)
    atEachTickDo:^(NSUInteger tickIndex) {
        [self timerTriggered:nil];
    } completion:^{
        [self timerTriggered:nil];
    }]
run];

这会调用 -timerTriggered: 20 次，分布在 10 秒内，其中不断减少的延迟（由给定的贝塞尔曲线指定）。

I needed this myself and wrote a component CPAccelerationTimer (Github):

[[CPAccelerationTimer accelerationTimerWithTicks:20
    totalDuration:10.0
    controlPoint1:CGPointMake(0.5, 0.0) // ease in
    controlPoint2:CGPointMake(1.0, 1.0)
    atEachTickDo:^(NSUInteger tickIndex) {
        [self timerTriggered:nil];
    } completion:^{
        [self timerTriggered:nil];
    }]
run];

This calls -timerTriggered: 20 times, spread out over 10 seconds, with ever-decreasing delays (as specified by the given Bézier curve).

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苦行僧 2024-12-18 22:05:16

每次运行此方法时，您都会创建一个名为 delay 的新变量，然后尝试将其设置为自身减 1。这是未定义的行为（该变量未初始化为任何内容），并且很可能导致延迟的垃圾值。*

您需要将延迟存储在实例变量中。

- (void) runTimer {
    // You are declaring a new int called |delay| here.
    int delay = delay - 1;
    // This is not the same |delay| that you have declared in your header.
    // To access that variable, use:
    delay = delay - 1;

*邪恶超自然生物感染鼻窦也是一种可能。

Every time this method is run, you make a new variable called delay, then try to set it to itself minus 1. This is Undefined Behavior (the variable was not initialized to anything), and is likely to result in a garbage value for delay.*

You need to store the delay in an instance variable.

- (void) runTimer {
    // You are declaring a new int called |delay| here.
    int delay = delay - 1;
    // This is not the same |delay| that you have declared in your header.
    // To access that variable, use:
    delay = delay - 1;

*A sinus infestation by evil-aligned supernatural beings is also a possibility.

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蝶…霜飞 2024-12-18 22:05:16

您必须在某个地方声明延迟，例如在类接口中或作为静态变量。

另外，每次都创建一个新的计时器，而不是让它重复。

int delay = INITIAL_DELAY;

-(void)runtimer{
    [NSTimer scheduledTimerWithTimeInterval:(NSTimeInterval)(delay--) target:self selector:@selector(runTimer:) userInfo:nil repeats:NO];
}

You have to declare the delay somewhere, like in the class interface or as a static variable.

Also, create a new timer every time, instead of having it repeat.

int delay = INITIAL_DELAY;

-(void)runtimer{
    [NSTimer scheduledTimerWithTimeInterval:(NSTimeInterval)(delay--) target:self selector:@selector(runTimer:) userInfo:nil repeats:NO];
}

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