我的swift代码遇到了一些问题，我想验证一个按钮动作来启动一个计时器，我已经设法做了。
出现了一个问题，当用户发送背景时，它会暂停计时器，直到它被召回，然后从它停止的地方继续进行，那么应该是几小时的倒计时持续时间更长了！？！
我设法编写了一个计时器，当用户从后台返回应用程序时，该计时器现在会倒计时并启动。
我遇到的问题是我似乎无法将两者结合在一起！这开始变得非常令人沮丧，我现在能看到的只是行和代码行。
var timer = Timer()
var counter = 60
var password_Text: UITextField?
@IBOutlet weak var timerLabel: UILabel!
@IBOutlet weak var timerButton: UIButton!
@IBAction func timerButton(_ sender: Any) {
timerButton.isEnabled = false
Timer.scheduledTimer(timeInterval: 43200, target: self, selector: #selector(myTimerTick), userInfo: nil, repeats: false)
var password_Text: UITextField?
let alertController = UIAlertController(title: "To start your own £10 APPi Hour, and get 2 Beers or 2 Cocktails", message: "get a memeber of the team to enter the password, but use it wisely, as you can only use it once per day. Remember with great power comes great responsability", preferredStyle: UIAlertControllerStyle.alert)
let tickoff_action = UIAlertAction(title: "let the APPiness commence", style: UIAlertActionStyle.default) {
action -> Void in
if let password = password_Text?.text{
print("password = \(password)")
if password == "baruba151" {
self.counter = 60
self.timerLabel.text = String(self.counter)
self.timer = Timer.scheduledTimer(timeInterval: 60, target: self, selector: #selector(appiHour.updateCounter), userInfo: nil, repeats: true)
}
} else {
print("No password entered")
}
}
alertController.addTextField { (txtpassword) -> Void in
password_Text = txtpassword
password_Text!.isSecureTextEntry = true
password_Text!.placeholder = ""
}
alertController.addAction(tickoff_action)
self.present(alertController, animated: true, completion: nil)
}
func myTimerTick() {
timerButton.isEnabled = true
}
@IBOutlet weak var timerStartButton: UIButton!
func updateCounter() {
counter -= 1
timerLabel.text = String(counter)
if counter == 0{
timer.invalidate()
counter = 0
}
}
这是我验证计时器启动按钮和启动计时器的代码。
class ViewController: UIViewController {
// Setup a timer and a counter for use
var timer = Timer()
var counter : TimeInterval = 0
var startDate: NSDate?
override func viewDidLoad() {
@IBOutlet weak var timerStart: UIButton!
@IBOutlet weak var startButton: UIButton!
@IBOutlet weak var timerStart: UIButton!
@IBOutlet weak var timerStart: UIButton!
@IBOutlet weak var timerStart: UIButton!
// Set the initial date
self.startDate = NSDate()
}
@IBOutlet weak var label: UILabel!
// Invalidest the timer, resets the counter and udpates the label
@IBAction func resetTimer(sender: AnyObject) {
// Invalidate the timer, reset the label.
self.timer.invalidate()
self.label.text = ""
self.counter = 0
}
// A button that when pressed starts and stops the timer
@IBAction func timerBttnTouched(sender: AnyObject) {
if self.timer.isValid {
self.timer.invalidate()
} else {
self.setupTimer()
}
}
// Does the actual counting everytime the timer calls this method
func timerFired() {
let now = NSDate()
let difference = now.timeIntervalSince(self.startDate! as Date)
// Format the difference for display
// For example, minutes & seconds
let dateComponentsFormatter = DateComponentsFormatter()
dateComponentsFormatter.string(from: difference)
self.label.text = dateComponentsFormatter.string(from: difference)
}
// Setups a timer, adds it to the run loop and specifies what method should fire when the timer fires
func setupTimer() {
// Sets up the timer, this will call the timerFired method every second
self.timer = Timer(
timeInterval: 1,
target: self,
selector: #selector(self.timerFired),
userInfo: nil,
repeats: true)
// Add the timer to the run loop
RunLoop.current.add(
self.timer,
forMode: RunLoopMode.defaultRunLoopMode)
}
}
这是将计时器发送到后台并带回正确时间的代码。
我尝试将2合并在一起并获得未解决的标识符错误，但未成功。就在这里。
class ViewController: UIViewController {
// Setup a timer and a counter for use
var timer = Timer()
var counter : TimeInterval = 0
var password_Text: UITextField?
@IBOutlet weak var label: UILabel!
@IBOutlet weak var timerButton: UIButton!
// Invalidest the timer, resets the counter and udpates the label
@IBAction func resetTimer(_ sender: Any) {
// Invalidate the timer, reset the label.
self.timer.invalidate()
self.label.text = ""
self.counter = 0
}
// A button that when pressed starts and stops the timer
// There's no pause/resume, so it's invalidated & created again
// But the counter value reamins the same
@IBAction func timerStart(_ sender: Any) {
timerButton.isEnabled = false
Timer.scheduledTimer(timeInterval: 5, target: self, selector: #selector(myTimerTick), userInfo: nil, repeats: false)
var password_Text: UITextField?
let alertController = UIAlertController(title: "To start your own £10 APPi Hour, and get 2 Beers or 2 Cocktails", message: "get a memeber of the team to enter the password, but use it wisely, as you can only use it once per day. Remember with great power comes great responsability", preferredStyle: UIAlertControllerStyle.alert)
let tickoff_action = UIAlertAction(title: "let the APPiness commence", style: UIAlertActionStyle.default) {
action -> Void in
if let password = password_Text?.text{
print("password = \(password)")
if password == "baruba151" {
// Does the actual counting everytime the timer calls this method
func timerFired() {
self.counter += 1
self.label.text = "\(self.counter)"
}
}
} else {
print("No password entered")
}
}
alertController.addTextField { (txtpassword) -> Void in
password_Text = txtpassword
password_Text!.isSecureTextEntry = true
password_Text!.placeholder = ""
}
alertController.addAction(tickoff_action)
self.present(alertController, animated: true, completion: nil)
if self.timer.isValid {
self.timer.invalidate()
}
func myTimerTick() {
timerButton.isEnabled = true
}
// Setups a timer, adds it to the run loop and specifies what method should fire when the timer fires
func setupTimer() {
// Setupt the timer, this will call the timerFired method every second
self.timer = Timer(
timeInterval: 0.5, // the rate in which the timer runs
target: self,
selector: #selector(self.timerFired),
userInfo: nil,
repeats: true)
// Add the timer to the run loop
RunLoop.current.add(
self.timer,
forMode: RunLoopMode.defaultRunLoopMode)
}
}
}
提前感谢您的帮助。