即使按下HOME按钮我在后台也要继续我的计时器。我怎么能这样做?
这是我的工作代码,它是Workout的计时器。我在计数结束时使用闹钟:
import UIKit
import AVFoundation
class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {
var pickerInfo: [String] = []
var tempsCuisson:Int = 0
var timer:Timer = Timer()
var lecteur:AVAudioPlayer = AVAudioPlayer()
var estActif:Bool = false
var selection:Int?
//outlets
@IBOutlet weak var minuteurLabel: UILabel!
override func viewDidAppear(_ animated: Bool) {
minuteurLabel.text = minuteurString(temps: tempsCuisson)
}
@IBOutlet weak var activerMinuteurBtn: UIButton!
@IBOutlet weak var pickerView: UIPickerView!
@IBOutlet weak var navBar: UINavigationBar!
//actions
@IBAction func activerMinuteurAction(_ sender: UIButton) {
compteur()
}
@IBAction func resetMinuteurAction(_ sender: UIButton) {
resetCompteur()
}
override func viewDidLoad() {
super.viewDidLoad()
//datasource + delegate
pickerView.dataSource = self
pickerView.delegate = self
pickerInfo = ["00.15", "00.30", "00:45",
"01:00", "01:15", "01:30", "01:45",
"02:00", "02:15", "02:30", "02:45",
"03:00", "03:15", "03:30", "03:45",
"04:00", "04:15", "04:30", "04:45",
"05:00", "05:15", "05:30", "05:45",
"06:00", "06:15", "06:30", "06:45",
"07:00", "07:15", "07:30", "07:45",
"08:00", "08:15", "08:30", "08:45",
"09:00", "09:15", "09:30", "09:45", "10:00"
]
activerMinuteurBtn.setTitleColor(UIColor.white, for: UIControlState.normal)
activerMinuteurBtn.isEnabled = false
activerMinuteurBtn.alpha = 0.3
alarm()
}
func selectionCuisson(selection: Int) {
var titreVC:String?
switch selection {
case 0:
//code
tempsCuisson = 015
minuteurLabel.text = minuteurString(temps: tempsCuisson)
navBar.topItem?.title = titre(str: pickerInfo[selection])
break
case 1:
//code
tempsCuisson = 030
minuteurLabel.text = minuteurString(temps: tempsCuisson)
navBar.topItem?.title = titre(str: pickerInfo[selection])
break
case 2:
//code
tempsCuisson = 045
minuteurLabel.text = minuteurString(temps: tempsCuisson)
navBar.topItem?.title = titre(str: pickerInfo[selection])
break
case 3:
//code
tempsCuisson = 060
minuteurLabel.text = minuteurString(temps: tempsCuisson)
navBar.topItem?.title = titre(str: pickerInfo[selection])
break
所有情况......
default:
//code
print("Aucune sélection")
break
}
//pour afficher option sélectionnée dans barre navigation
//self.title = titreVC
activerMinuteurBtn.isEnabled = true
activerMinuteurBtn.alpha = 1
minuteurLabel.textColor = UIColor.black
}
func minuteurString(temps: Int) -> String {
let minutes = Int(temps) / 60 % 60
let secondes = Int(temps) % 60
return String(format: "%02i:%02i", minutes, secondes)
}
func compteur() {
if (!estActif) {
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.incrementer), userInfo: nil, repeats: true)
timer.fire()
activerMinuteurBtn.setTitle("STOP", for: UIControlState.normal)
activerMinuteurBtn.setTitleColor(UIColor.orange, for: UIControlState.normal)
estActif = true
} else {
timer.invalidate()
activerMinuteurBtn.setTitle("Démarrer", for: UIControlState.normal)
activerMinuteurBtn.setTitleColor(UIColor.blue, for: UIControlState.normal)
estActif = false
}
}
func incrementer() {
if (tempsCuisson == 0) {
timer.invalidate()
minuteurLabel.text = "00:00"
activerMinuteurBtn.setTitle("Démarrer", for: UIControlState.normal)
activerMinuteurBtn.setTitleColor(UIColor.blue, for: UIControlState.normal)
minuteurLabel.textColor = UIColor.green
activerMinuteurBtn.isEnabled = false
activerMinuteurBtn.alpha = 0.3
lecteur.play()
} else {
tempsCuisson -= 1
minuteurLabel.text = minuteurString(temps: tempsCuisson)
}
}
func resetCompteur() {
timer.invalidate()
tempsCuisson = 0
minuteurLabel.text = "00:00"
activerMinuteurBtn.setTitle("Démarrer", for: UIControlState.normal)
activerMinuteurBtn.setTitleColor(UIColor.white, for: UIControlState.normal)
estActif = false
activerMinuteurBtn.isEnabled = false
activerMinuteurBtn.alpha = 0.3
pickerView.selectRow(0, inComponent: 0, animated: true)
}
//AVAudioPlayer
func alarm() {
DispatchQueue.global(qos: .userInitiated).async {
let fichier = Bundle.main.path(forResource: "alarm", ofType: "mp3")
do {
try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryAmbient, with:[.duckOthers])
try AVAudioSession.sharedInstance().setActive(true)
try self.lecteur = AVAudioPlayer(contentsOf: (URL(string: fichier!))!)
} catch {
print("erreur lecture ficher MP3")
}
}
}
//Retourner Titre
func titre(str:String) -> String {
return str
}
//MARK - PickerViewDataSource
// returns the number of 'columns' to display.
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
// returns the # of rows in each component..
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return pickerInfo.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return pickerInfo[row]
}
//changer couleur pickerView label
func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
let label = UILabel(frame: CGRect(x: 0, y: 0, width: pickerView.frame.size.width, height: 44))
label.textColor = UIColor.white
label.font = UIFont(name: "HelveticaNeue-Bold", size: 22)
label.textAlignment = .center
label.text = String(format:" %@", pickerInfo[row])
if (row == selection) {
label.textColor = UIColor.yellow
}
return label
}
//MARK - PickerViewDelegate
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
selectionCuisson(selection: row)
selection = row
}
}
答案 0 :(得分:2)
好的,所以如果不深入到您的代码中,您似乎正在使用Timer.scheduledTimer
手动减少用户每秒设置的时间。
这不是一项好的技术,因为你已经发现 - 它只有在你知道你对你的应用程序的时间具有绝对控制权时才有效。
相反,您应该做的是存储用户启动闹钟的时间,预计的结束时间,并运行计时器以定期更新UI。
(我的代码在这里并不完美,但它应该指出你正确的方向来解决让计时器在后台运行的问题。)
离。
class ViewController: UIViewController {
// this is pseudo-code as I don't have my compiler open :(
let start: Date!
let end: Date!
func selectionCuisson(selection: Int) {
...
start = Date()
end = Date(timeInterval: tempsCuisson, since: start)
}
}
然后创建一个只更新UI的计时器。
// You can set this to be faster than the increment, for a smoother UI experience
// put in compteur()? I think
timer = Timer.scheduledTimer(timeInterval: 0.2, target: self, selector: #selector(ViewController.incrementer), userInfo: nil, repeats: true)
timer.fire()
...
func incrementer() {
let tempsCuisson = end - start
if tempsCuisson < 0 {
// End your Timing Function here
timer.invalidate()
...
lecteur.play()
} else {
minuteurLabel.text = minuteurString(temps: tempsCuisson)
}
}
您还可以设置本地通知,以便在应用程序使用end
日期
// when the app becomes inactive
let notification = UILocalNotification()
...
notification.fireDate = end
UIApplication.shared.scheduleLocalNotification(notification)