How does my app recognize that a song finished? - iphone

Question

I´m working on my first app. It plays an mp3 song. Everything works fine, but I need the app to recognize that the sound finished, then change the button “pause” image to the “play” one. I can already do that, but just when the button is pressed, not when song ends.
Another issue is that when the song restarts after stop->play, it doesn´t continue playing at the previous volume setting (got a slider). The player starts at maximum volume. I can change the volume slider position, but I am not able to make the app respect the set volume when restarts.
Any help will be very appreciated!
Thnx a lot.

Answer 1

When using "AVAudioPlayerDelegate protocol delegate", please do not forget to set delegate (for example) as follows:
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *path = [[NSBundle mainBundle] pathForResource:#"33fr" ofType:#"mp3"];
NSURL *fileURL = [NSURL fileURLWithPath:path];
NSError *error = nil;
myPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:fileURL error:&error];
if (error) {
NSLog(#"error = %#", error);
return;
}
[myPlayer setDelegate:self]; <<=== HERE!
}
I uploaded sample code here. Please check it. ->
http://yahoo.jp/box/X7Hxfk

Answer 2

I have not done much of Objective-C but it looks like you need to implement a delegate.
I quote: "You implement a delegate to handle interruptions (such as an incoming phone call) and to update the user interface when a sound has finished playing."
I am just reading the AVAudioPlayer Class Reference here:
https://developer.apple.com/library/mac/#documentation/AVFoundation/Reference/AVAudioPlayerClassReference/Reference/Reference.html#//apple_ref/doc/uid/TP40008067

Answer 3

you can use the AVAudioPlayerDelegate protocol delegate
After the audio player is finished playing the song (if it does so
successfully), the audio PlayerDidFinishPlaying:successfully: delegate
method will be called in the delegate object of the audio player. We
can implement this method like below (this method is defined in the
AVAudioPlayerDelegate protocol):
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
if (flag)
{
NSLog(#"Audio player stopped correctly.");
}
else
{ NSLog(#"Audio player did not stop correctly.");
}
if ([player isEqual:self.audioPlayer])
{ self.audioPlayer = nil;
}
else
{ /* This is not the player */ }
}
in .h file add delegate like below code
#interface yourViewController : UIViewController <AVAudioPlayerDelegate>