參考鏈接:https://github.com/soapyigu/Swift-30-Projects

 1 import UIKit
 2 
 3 class Stopwatch: NSObject {
 4     var counter: Double
 5     var timer: Timer
 6     
 7     override init() {
 8         counter = 0.0
 9         timer = Timer()
10     }
11 }

  1 import UIKit
  2 
  3 class ViewController: UIViewController, UITableViewDelegate {
 
  4 
  5     // MARK: - Variables
  6     fileprivate let mainStopwatch: Stopwatch = Stopwatch()
  7     fileprivate let lapStopwatch: Stopwatch = Stopwatch()
  8     fileprivate var isPlay: Bool = false
  9     fileprivate var laps: [String] = []
 10     
 11     // MARK: - UI components
 12     @IBOutlet weak var timerLabel: UILabel!
 13
 
     @IBOutlet weak var lapTimerLabel: UILabel!
 14     @IBOutlet weak var playPauseButton: UIButton!
 15     @IBOutlet weak var lapRestButton: UIButton!
 16     @IBOutlet weak var lapsTableView: UITableView!
 17     
 18     // MARK: - Life Cycle
 19     override func viewDidLoad() {
 20         super.viewDidLoad()
 
 21         // Do any additional setup after loading the view, typically from a nib.
 22         
 23         let initCircleButton: (UIButton) -> Void = { button in
 24             button.layer.cornerRadius = 0.5 * button.bounds.size.width
 25             button.backgroundColor = UIColor.white
 26         }
 27         
 28         initCircleButton(playPauseButton)
 29         initCircleButton(lapRestButton)
 30         
 31         lapRestButton.isEnabled = false
 32         
 33         lapsTableView.delegate = self
 34         lapsTableView.dataSource = self
 35     }
 36 
 37     // MARK: - UI Settings
 38     override var shouldAutorotate: Bool {
 39         return false
 40     }
 41     
 42     override var preferredStatusBarStyle: UIStatusBarStyle {
 43         return UIStatusBarStyle.lightContent
 44     }
 45     
 46     override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
 47         return UIInterfaceOrientationMask.portrait
 48     }
 49     
 50     // MARK: - Actions
 51     @IBAction func playPauseTimer(_ sender: AnyObject) {
 52         lapRestButton.isEnabled = true
 53         
 54         changeButton(lapRestButton, title: "Lap", titleColor: UIColor.black)
 55         
 56         if !isPlay {
 57             unowned let weakSelf = self
 58             
 59             mainStopwatch.timer = Timer.scheduledTimer(timeInterval: 0.035, target: weakSelf, selector: Selector.updateMainTimer, userInfo: nil, repeats: true)
 60             lapStopwatch.timer = Timer.scheduledTimer(timeInterval: 0.035, target: weakSelf, selector: Selector.updateLapTimer, userInfo: nil, repeats: true)
 61             
 62             RunLoop.current.add(mainStopwatch.timer, forMode: .commonModes)
 63             RunLoop.current.add(lapStopwatch.timer, forMode: .commonModes)
 64             
 65             isPlay = true
 66             changeButton(playPauseButton, title: "Stop", titleColor: UIColor.red)
 67         } else {
 68             mainStopwatch.timer.invalidate()
 69             lapStopwatch.timer.invalidate()
 70             isPlay = false
 71             changeButton(playPauseButton, title: "Start", titleColor: UIColor.green)
 72             changeButton(lapRestButton, title: "Reset", titleColor: UIColor.black)
 73         }
 74     }
 75     
 76     @IBAction func lapResetTimer(_ sender: AnyObject) {
 77         if !isPlay {
 78             resetMainTimer()
 79             resetLapTimer()
 80             changeButton(lapRestButton, title: "Lap", titleColor: UIColor.lightGray)
 81             lapRestButton.isEnabled = false
 82         } else {
 83             if let timerLabelText = timerLabel.text {
 84                 laps.append(timerLabelText)
 85             }
 86             lapsTableView.reloadData()
 87             resetLapTimer()
 88             unowned let weakSelf = self
 89             lapStopwatch.timer = Timer.scheduledTimer(timeInterval: 0.035, target: weakSelf, selector: Selector.updateLapTimer, userInfo: nil, repeats: true)
 90             RunLoop.current.add(lapStopwatch.timer, forMode: .commonModes)
 91         }
 92     }
 93     
 94     override func didReceiveMemoryWarning() {
 95         super.didReceiveMemoryWarning()
 96         // Dispose of any resources that can be recreated.
 97     }
 98 
 99     // MARK: - Private Helpers
100     fileprivate func changeButton(_ button: UIButton, title: String, titleColor: UIColor) {
101         button.setTitle(title, for: .normal)
102         button.setTitleColor(titleColor, for: .normal)
103     }
104     
105     fileprivate func resetMainTimer() {
106         resetTimer(mainStopwatch, label: timerLabel)
107         laps.removeAll()
108         lapsTableView.reloadData()
109     }
110     
111     fileprivate func resetLapTimer() {
112         resetTimer(lapStopwatch, label: lapTimerLabel)
113     }
114     
115     fileprivate func resetTimer(_ stopwatch: Stopwatch, label: UILabel) {
116         stopwatch.timer.invalidate()
117         stopwatch.counter = 0.0
118         label.text = "00:00:00"
119     }
120     
121     @objc func updateMainTimer() {
122         updateTimer(mainStopwatch, label: timerLabel)
123     }
124     
125     @objc func updateLapTimer() {
126         updateTimer(lapStopwatch, label: lapTimerLabel)
127     }
128     
129     func updateTimer(_ stopwatch: Stopwatch, label: UILabel) {
130         stopwatch.counter = stopwatch.counter + 0.035
131         
132         var minutes: String = "\((Int)(stopwatch.counter / 60))"
133         if (Int)(stopwatch.counter / 60) < 10 {
134             minutes = "0\((Int)(stopwatch.counter / 60))"
135         }
136         
137         var seconds: String = String(format: "%.2f", (stopwatch.counter.truncatingRemainder(dividingBy: 60)))
138         if stopwatch.counter.truncatingRemainder(dividingBy: 60) < 10 {
139             seconds = "0" + seconds
140         }
141         
142         label.text = minutes + ":" + seconds
143     }
144 }
145 
146 // MARK: - UITableViewDataSource
147 extension ViewController: UITableViewDataSource {
148     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
149         return laps.count
150     }
151     
152     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
153         let identifier: String = "lapCell"
154         let cell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: identifier, for: indexPath)
155         
156         if let labelNum = cell.viewWithTag(11) as? UILabel {
157             labelNum.text = "Lap \(laps.count - (indexPath as NSIndexPath).row)"
158         }
159         
160         if let labelTimer = cell.viewWithTag(12) as? UILabel {
161             labelTimer.text = laps[laps.count - (indexPath as NSIndexPath).row - 1]
162         }
163         
164         return cell
165     }
166 }
167 
168 // MARK: - Extension
169 fileprivate extension Selector {
170     static let updateMainTimer = #selector(ViewController.updateMainTimer)
171     static let updateLapTimer = #selector(ViewController.updateLapTimer)
172 }

第十二天:SwiftStopWatch