swift - 无法将值类型“”转换为预期参数“UInt64”

在从Swift 2转换为Swift 3之后，我使用了这段代码，然后出现了这个错误消息。任何帮助都将不胜感激。我对斯威夫特3很陌生。

func checkIfCorrect (_ buttonPressed:Int) {
    if buttonPressed == playlist[numberOfTaps] {
        if numberOfTaps == playlist.count - 1 { // we have arrived at the last item of the playlist

            let time = DispatchTime(uptimeNanoseconds: DispatchTime.now()) + Double(Int64(NSEC_PER_SEC)) / Double(NSEC_PER_SEC)

            DispatchQueue.main.asyncAfter(deadline: time, execute: {
                    self.nextRound()
            })

            return
        }

        numberOfTaps += 1
    }else{ // GAME OVER
        resetGame()
    }
}

最佳答案

这里有：

let time = DispatchTime(uptimeNanoseconds: DispatchTime.now()) + Double(Int64(NSEC_PER_SEC)) / Double(NSEC_PER_SEC)

放这个：

let time = DispatchTime.now() + 1.0 // or however long you want the delay to be