为什么Xcode用指向单词“timer”的箭头说“预期的声明”？

Question

我得到下面func pauseAction行，上面写着“预期的声明”的错误，有一个箭头指向单词“计时器”

var timeLeft = 10 
var timer = Timer() 
var score: Int = 0 { 
    didSet { 
     scoreLabel.text = "\(score)" 
    } 
} 
@IBOutlet var scoreLabel: UILabel! 
@IBAction func tapButton(_ sender: Any) { 
    score += 1 
} 
@IBAction func pauseAction(_ sender: Any) { 

} 

timer = Timer.scheduledTimer(timeInterval: 1.0, target:self, selector: Selector(("updateTimer")), userInfo: nil, repeats: true) 
func updateTimer() { 
    timeLeft -= 1 
    timeLabel.text = String(timeLeft) 
    if timeLeft == 0 { 
     timer.invalidate() 
    } 
} 

Answer 1

在这种情况下有望声明意味着代码必须是内方法/功能例如

func startTimer() 
{ 
    timer = Timer.scheduledTimer(timeInterval: 1.0, target:self, selector: #selector(updateTimer), userInfo: nil, repeats: true) 
}