Question

我在操场上和计时器发布者玩了一段时间。下面是我的代码

let timer = Timer
    .publish(every: 1.0, on: .main, in: .common)
.autoconnect()

var counter = 0
let subscriber = timer
    .map({ (date) -> Void in
        counter += 1
    })
    .sink { _ in

        print("I am printing the counter \(counter)")
}

if counter > 5 {
    timer.upstream.connect().cancel() //1.nothing happened
    subscriber.cancel() //2. nothing happened too. :(
}

但是我无法同时使用第1行和第2行来停止计时器。我到底在想什么？

Answer 1

您的代码在定时器启动之前执行的时间不大于5时...这就是为什么这些行未执行的原因...

let timer = Timer
    .publish(every: 1.0, on: .main, in: .common)
.autoconnect()

var counter = 0
let subscriber = timer
    .map({ (date) -> Void in
        counter += 1
    })
    .sink { _ in

        print("I am printing the counter \(counter)")
        if counter >= 5 {
                  print("greater than 5")
                  timer.upstream.connect().cancel()

              }
}

如何停止计时器发布者？

1 个答案: