在Swift中休眠或延迟Timer线程

Question

I have been trying to create a delay of one or two seconds on a self repeating timer. This is how I create the timer:

currentThread = Timer.scheduledTimer(timeInterval: 0.001, target: self, selector: #selector(Movement.updatePosition), userInfo: nil, repeats: true)

So the timer constantly runs the method updatePosition(). However, I have an if statement within that method where I would like to have the timer be delayed for a few seconds:

if distance <= respawnDistance * 0.1 {
    // Delay timer for 1 second     
}

And I was thinking that I could do this:

currentThread.invalidate()

And then just create another Timer that runs after 1 second, which leads to the reactivation of the previous timer. However, I think that would be inefficient if there is a way to sleep the current Timer?

Answer 1

NSTimer is not that accurate. Its maximum resolution is somewhere around 50 - 100ms. Anyhow, you can add a variable to control the firing of the timer:

var doNotUpdate = false

if distance <= respawnDistance * 0.1 {
    doNotUpdate = true
    DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
        doNotUpdate = false
    }
}

func updatePosition() {
    if doNotUpdate { return }

    // update your position
}