Pausing a NSTimer/Stopwatch

Pausing a NSTimer/Stopwatch

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:
.h:
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface Timer : UIViewController <AVAudioRecorderDelegate,
AVAudioPlayerDelegate>
{
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
.m:
#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
{
// Create date from the elapsed time
NSDate *currentDate = [NSDate date];
NSTimeInterval timeInterval = [currentDate
timeIntervalSinceDate:self.startDate];
NSDate *timerDate = [NSDate dateWithTimeIntervalSince1970:timeInterval];
// Create a date formatter
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"HH:mm:ss.SSS"];
[dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0.0]];
// Format the elapsed time and set it to the label
NSString *timeString = [dateFormatter stringFromDate:timerDate];
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
[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