objective-c - 每次运行时减少 NSTimer 间隔

Question

我希望我的 NSTimer 每次运行时都能加快速度:

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

}

但这行不通。如何让延迟越来越小？

Answer 1

我needed this myself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，延迟不断减少(由给定的贝塞尔曲线指定)。