Swift 定时器不会停止

Question

Code:

var timerCount: Int = 15

hideTimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { (timer) in
    self.timerCount -= 1
    print(self.timerCount)
    if self.timerCount <= 0 {
        if self.hideTimer != nil {
            self.hideTimer.invalidate()
            self.hideTimer = nil
        }
    }
})

print statement just keeps on printing into negative numbers =(

This is happening within a UITableViewCell, if that matters.

What am I doing wrong?

Answer 1

You get a reference to the timer in the callback: '(timer)'. Use this one to invalidate your timer:

var timerCount: Int = 3

let hideTimer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { (timer) in
    timerCount -= 1
    print(timerCount)
    if timerCount <= 0 {
        timer.invalidate()
    }
})