How to pause an audio and its timer slider in iOS? - ios

Question

I am using the AVAudioPlayer class to play audio. I have implemented a timer slider that progresses as the music is playing.
Here is my code:
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
AudioBool = YES;
}
- (IBAction)play:(id)sender
{
// Code to read the file from resource folder and sets it in the AVAudioPlayer
// Sets the audio timer in 1 sec intervals
sliderTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(updateTime) userInfo:nil repeats:YES];
// Sets the slider maximum value
slider.maximumValue = player.duration;
// Sets the valueChanged target
[slider addTarget:self action:#selector(sliderChanged : ) forControlEvents : UIControlEventValueChanged];
// Play the audio
// [player prepareToPlay];
[player play];
if(AudioBool == YES)
{
[player play];
AudioBool = NO;
}
else
{
[player pause];
AudioBool = YES;
}
}
- (void)updateTime
{
// Updates the slider about the music time
slider.value = player.currentTime;
NSString *time = [self timeFormatted:slider.value];
self.timerLabe.text = time;
}
- (NSString *)timeFormatted:(int)totalSeconds
{
int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
//int hours = totalSeconds / 3600;
//return [NSString stringWithFormat:#"%02d:%02d:%02d",hours, minutes, seconds];
return [NSString stringWithFormat:#"%02d:%02d", minutes, seconds];
}
- (IBAction)sliderChanged : (UISlider *)sender
{
// skips music with slider changged
[player pause];
[player setCurrentTime:slider.value];
// [player prepareToPlay];
[player play];
}
// Stops the timer when audio finishes
- (void)audioPlayerDidFinishPlaying : (AVAudioPlayer *)player successfully :
(BOOL)flag
{
// Music completed
if (flag)
{
[sliderTimer invalidate];
}
}
2 issues I have:
I can't seem to pause the audio. When I re-tap the play button, it re-starts the audio at the beginning instead of pausing it.
The slider also re-starts at the beginning instead of pausing.
How do I fix these issues?
Thanks

Answer 1

try this solution, you need to make changes in play method basically..shift the slider initialisation in viewDidLoad also play/pause based on isPlaying property (AudioBool property in your code)
#import <AVFoundation/AVFoundation.h>
#interface ViewController ()
#property (nonatomic, strong) AVAudioPlayer *audioPlayer;
#property (nonatomic) BOOL isPlaying;
#property (nonatomic, strong) NSTimer *sliderTimer;
#property (weak, nonatomic) IBOutlet UISlider *slider;
#property (weak, nonatomic) IBOutlet UILabel *timerLabel;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
NSBundle *mainBundle = [NSBundle mainBundle];
NSString *filePath = [mainBundle pathForResource:#"10101" ofType:#"mp3"];
NSURL *fileURL = [NSURL fileURLWithPath:filePath];
self.isPlaying = NO;
NSError *error;
self.audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:&error];
[self.audioPlayer prepareToPlay];
[self.slider addTarget:self action:#selector(sliderChanged:) forControlEvents:UIControlEventValueChanged];
self.slider.minimumValue = 0;
self.slider.maximumValue = self.audioPlayer.duration;
}
- (IBAction)play:(id)sender {
if (self.isPlaying)
{
// Music is currently playing
[self.audioPlayer pause];
self.isPlaying = !self.isPlaying;
}
else
{
// Music is currenty paused/stopped
[self.audioPlayer play];
self.isPlaying = !self.isPlaying;
self.sliderTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(updateTime) userInfo:nil repeats:YES];
}
}
- (void)sliderChanged:(UISlider *)sender
{
// skips music with slider changged
[self.audioPlayer pause];
[self.audioPlayer setCurrentTime:self.slider.value];
[self.audioPlayer play];
}
- (void)updateTime
{
// Updates the slider about the music time
self.slider.value = self.audioPlayer.currentTime;
NSString *time = [self timeFormatted:self.slider.value];
self.timerLabel.text = time;
}
- (NSString *)timeFormatted:(int)totalSeconds
{
int seconds = totalSeconds % 60;
int minutes = (totalSeconds / 60) % 60;
return [NSString stringWithFormat:#"%02d:%02d", minutes, seconds];
}
// Stops the timer when audio finishes
- (void)audioPlayerDidFinishPlaying : (AVAudioPlayer *)player successfully:(BOOL)flag
{
// Music completed
if (flag)
{
[self.sliderTimer invalidate];
}
}