我是Swift的新手 - 尝试为iPhone/iPad构建应用程序。希望您能够帮助我。swift:停止倒数计时器为零
我想包括一个从04:00分钟到00:00倒计时的计时器。然后它应该停止在零并触发音效(我还没有尝试过)。当您按下开始按钮时,倒数开始(在我的代码中,startTimer和stopTimer指向同一个按钮;但是,按钮仅在开始时被按下一次)。
计时器启动并倒计时就好了。它按计划将秒转换成分钟。但是,我的主要问题是我无法让倒计时停止在零。它继续超越00:0-1等。我该如何解决这个问题?
import Foundation
import UIKit
import AVFoundation
class Finale : UIViewController {
@IBOutlet weak var timerLabel: UILabel!
var timer = NSTimer()
var count = 240
var timerRunning = false
override func viewDidLoad() {
super.viewDidLoad()
}
func updateTime() {
count--
let seconds = count % 60
let minutes = (count/60) % 60
let hours = count/3600
let strHours = hours > 9 ? String(hours) : "0" + String(hours)
let strMinutes = minutes > 9 ? String(minutes) : "0" + String(minutes)
let strSeconds = seconds > 9 ? String(seconds) : "0" + String(seconds)
if hours > 0 {
timerLabel.text = "\(strHours):\(strMinutes):\(strSeconds)"
}
else {
timerLabel.text = "\(strMinutes):\(strSeconds)"
}
}
@IBAction func startTimer(sender: AnyObject) {
var timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateTime"), userInfo: nil, repeats: true)
}
func stopTimer() {
if count == 0 {
timer.invalidate()
timerRunning = false
}
}
@IBAction func stopTimer(sender: AnyObject) {
timerRunning = false
if count == 0 {
timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("stopTimer"), userInfo: nil, repeats: true)
timerRunning = true
}}
}
http://stackoverflow.com/a/29583418/2303865 –