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POCreating a StopWatch in Iphone
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copied!<p>I am trying to create a simple stopwatch. I referred to this website ( <a href="http://www.apptite.be/tutorial_ios_stopwatch.php" rel="nofollow">http://www.apptite.be/tutorial_ios_stopwatch.php</a>) to do this app. When I click the start button, I get -596:-31:-23:-648 and the stopwatch does not run.</p> <p>The code looks like:</p> <p>ViewController.h</p> <pre><code>#import <UIKit/UIKit.h> @interface ViewController : UIViewController{ UILabel *lbl; NSTimer *stopTimer; NSDate *startDate; } @property (strong,nonatomic) IBOutlet UILabel *lbl; -(IBAction)startPressed:(id)sender; -(IBAction)stopPressed:(id)sender; -(void)updateTimer; @end </code></pre> <p>ViewController.m</p> <pre><code>#import "ViewController.h" @interface ViewController () @end @implementation ViewController @synthesize lbl; - (void)viewDidLoad { [super viewDidLoad]; lbl.text = @"00.00.00.000"; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } -(IBAction)startPressed:(id)sender{ if (stopTimer == nil) { stopTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/10.0 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES]; } } -(IBAction)stopPressed:(id)sender{ [stopTimer invalidate]; stopTimer = nil; //[self updateTimer]; } -(void)updateTimer{ NSDate *currentDate = [NSDate date]; NSTimeInterval timeInterval = [currentDate timeIntervalSinceDate:startDate]; NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval]; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"HH:mm:ss.SSS"]; [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]]; NSString *timeString=[dateFormatter stringFromDate:timerDate]; lbl.text = timeString; } @end </code></pre> <p>Need some guidance on solving the error. Not sure where the error is. Appreciate any help...</p>

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