swift - 如何在 60 秒后取消 NSTimer？

Question

我有一个按钮操作将数据发送到 Parse。一旦按下该按钮，标题将更改为“取消”，当按下“取消”按钮时，数据将从 Parse 中删除。我想知道如何在 60 秒后使用 NSTimer 自动取消。我也设置了一个数组(var isCalling = false)

// Function called by within NSTimer in button action

func refresh(){
    self.callButtonTapped(nil)
    !isCalling
}

// Within the button action

   if error == nil {
                        //Success
                        self.isCalling = true
                        self.callButton.setTitle("Cancel", forState: UIControlState.Normal)
                        self.timer = NSTimer(timeInterval: 60.0, target: self, selector: #selector (self.refresh), userInfo: nil, repeats: false)
                    }

Answer 1

您应该使用NSTimer.scheduledTimerWithTimeInterval，只需替换此行:

self.timer = NSTimer(timeInterval: 60.0, target: self, selector: #selector(self.refresh), userInfo: nil, repeats: false)

与

swift 2

self.timer = NSTimer.scheduledTimerWithTimeInterval(60.0, target: self, selector: #selector(self.refresh), userInfo: nil, repeats: false)

swift 3、4、5

self.timer = Timer.scheduledTimer(timeInterval: 60.0, target: self, selector: #selector(self.refresh), userInfo: nil, repeats: false)

阅读NSTimer Class Reference如果您想了解有关创建计时器的更多信息。