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POPausing a NSTimer/Stopwatch
 

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    <p>In the project I am working on I need to have a stopwatch that will pause and continue. So far All of the basic functions work, but I have not been able to find a way to pause the timer and re-start it. FYI, I have already checked the other postings and they didn't work. Code:</p> <p>.h:</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import &lt;AVFoundation/AVFoundation.h&gt; @interface Timer : UIViewController &lt;AVAudioRecorderDelegate, AVAudioPlayerDelegate&gt; { AVAudioRecorder *recorder; AVAudioPlayer *player; } @property (weak, nonatomic) IBOutlet UIButton *recordPauseButton; @property (weak, nonatomic) IBOutlet UIButton *stopButton; @property (weak, nonatomic) IBOutlet UILabel *stopwatchLabel; -(IBAction)recordPauseTapped:(id)sender; -(IBAction)stopTapped:(id)sender; @end </code></pre> <p>.m:</p> <pre><code>#import "Timer.h" @interface SongIdeasRecording () @property (strong, nonatomic) NSTimer *stopWatchTimer; // Store the timer that fires after a certain time @property (strong, nonatomic) NSDate *startDate; // Stores the date of the click on the start button @end @implementation Timer @synthesize stopButton, playButton, recordPauseButton, stopwatchLabel; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)updateTimer { // Timer is 1/10 of a second so thats what we add to stopwatch NSTimeInterval timeInterval = 0.1; // Create a date formatter NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"HH:mm:ss.SSS"]; [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]]; // Take the time currently displayed on the stopwatch and add the time interval to it NSDate *oldDate = [dateFormatter dateFromString:self.stopwatchLabel.text]; NSDate *newDate = [oldDate dateByAddingTimeInterval:timeInterval]; //Get a string representation of the new date NSString *timeString = [dateFormatter stringFromDate:newDate]; self.stopwatchLabel.text = timeString; } - (IBAction)recordPauseTapped:(id)sender { self.startDate = [NSDate date]; // Create the stop watch timer that fires every 100 ms self.stopWatchTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/10.0 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES]; // Stop the audio player before recording if (player.playing) { [player stop]; } if (!recorder.recording) { AVAudioSession *session = [AVAudioSession sharedInstance]; [session setActive:YES error:nil]; // Start recording [recorder record]; [recordPauseButton setTitle:@"Pause" forState:UIControlStateNormal]; } else { // Pause recording [self.stopWatchTimer invalidate]; self.stopWatchTimer = nil; [self updateTimer]; [recorder pause]; [recordPauseButton setTitle:@"Record" forState:UIControlStateNormal]; } [stopButton setEnabled:YES]; [playButton setEnabled:NO]; } - (IBAction)stopTapped:(id)sender { [recorder stop]; AVAudioSession *audioSession = [AVAudioSession sharedInstance]; [audioSession setActive:NO error:nil]; [self.stopWatchTimer invalidate]; self.stopWatchTimer = nil; [self updateTimer]; } - (void) audioRecorderDidFinishRecording:(AVAudioRecorder *)avrecorder successfully: (BOOL)flag{ [recordPauseButton setTitle:@"Record" forState:UIControlStateNormal]; [stopButton setEnabled:NO]; [playButton setEnabled:YES]; } - (IBAction)playTapped:(id)sender { if (!recorder.recording){ player = [[AVAudioPlayer alloc] initWithContentsOfURL:recorder.url error:nil]; [player setDelegate:self]; [player play]; self.startDate = [NSDate date]; stopwatchLabel.text = @"00:00:00.000"; self.stopWatchTimer = [NSTimer scheduledTimerWithTimeInterval:1.0/10.0 target:self selector:@selector(updateTimer) userInfo:nil repeats:YES]; } } - (void) audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag { [self.stopWatchTimer invalidate]; self.stopWatchTimer = nil; [self updateTimer]; } @end </code></pre>
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    1. USDan Grueneberg
    1. USDan Grueneberg
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    1. COWhat specifically went wrong with the several results that are showed in the "Related" section? Don't just say "they didn't work" or I will mark your question as a duplicate.
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      1. USborrrden
 

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