Created
August 26, 2014 02:25
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| // | |
| // | |
| // ViewController.swift | |
| // Stop Watch App | |
| // | |
| // Created by aGupieWare on 8/2/14. | |
| // Copyright (c) 2014 aGupieWare. All rights reserved. | |
| // | |
| import UIKit | |
| import QuartzCore | |
| class ViewController: UIViewController { | |
| @IBOutlet weak var numericDisplay: UILabel! | |
| @IBOutlet weak var resetButton: UIButton! | |
| @IBOutlet weak var startStopButton: UIButton! | |
| var displayLink: CADisplayLink! | |
| var lastDisplayLinkTimeStamp: CFTimeInterval! | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| // Do any additional setup after loading the view, typically from a nib. | |
| // Set default view element values // | |
| self.numericDisplay.text = "0.00" | |
| self.resetButton.setTitle("Reset", forState: UIControlState.Normal) | |
| self.startStopButton.setTitle("Start", forState: UIControlState.Normal) | |
| // Initializing the display link and directing it to call our displayLinkUpdate: method when an update is available // | |
| self.displayLink = CADisplayLink(target: self, selector: "displayLinkUpdate:") | |
| // Ensure that the display link is initially not updating // | |
| self.displayLink.paused = true; | |
| // Scheduling the Display Link to Send Notifications // | |
| self.displayLink.addToRunLoop(NSRunLoop.mainRunLoop(), forMode: NSRunLoopCommonModes) | |
| // Initial timestamp // | |
| self.lastDisplayLinkTimeStamp = self.displayLink.timestamp | |
| } | |
| override func didReceiveMemoryWarning() { | |
| super.didReceiveMemoryWarning() | |
| // Dispose of any resources that can be recreated. | |
| } | |
| @IBAction func resetButtonPressed(sender: AnyObject) { | |
| // Pause display link updates // | |
| self.displayLink.paused = true; | |
| // Set default numeric display value // | |
| self.numericDisplay.text = "0.00" | |
| // Set button to Start state // | |
| self.startStopButton.setTitle("Start", forState: UIControlState.Normal) | |
| // Reset our running tally // | |
| self.lastDisplayLinkTimeStamp = 0.0 | |
| } | |
| @IBAction func startStopButtonPressed(sender: AnyObject) { | |
| // Toggle the display link's paused boolean value // | |
| self.displayLink.paused = !(self.displayLink.paused) | |
| // if the display link is not updating us... // | |
| var buttonText:String = "Stop" | |
| if self.displayLink.paused { | |
| if self.lastDisplayLinkTimeStamp > 0 { | |
| buttonText = "Resume" | |
| } | |
| else { | |
| buttonText = "Start" | |
| } | |
| } | |
| self.startStopButton.setTitle(buttonText, forState: UIControlState.Normal) | |
| } | |
| func displayLinkUpdate(sender: CADisplayLink) { | |
| // Update running tally // | |
| self.lastDisplayLinkTimeStamp = self.lastDisplayLinkTimeStamp + self.displayLink.duration | |
| // Format the running tally to display on the last two significant digits // | |
| let formattedString:String = String(format: "%0.2f", self.lastDisplayLinkTimeStamp) | |
| // Display the formatted running tally // | |
| self.numericDisplay.text = formattedString; | |
| } | |
| } |
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For some reason when I click the "reset button" It goes back to "0.00"... but I pressed "Start" then it starts where the last timeStamp finished.... Any ideas?