Objective C protocol method is not called - objective-c

Question

I have created singleton class for AVAudioPlayer. I am able to call the methods in the class and everything works fine. When the song finishes,the method (void)audioPlayerDidFinishPlaying is called which in turn suppose to call the method ' processSuccessful' in my downloadPlay.m class. But, it is not calling the method 'processSuccessful'
My codes as follows
PlayerManager.h
#import <Foundation/Foundation.h>
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVFoundation.h>
#protocol ProcessDataDelegate <NSObject>
#required
- (void) processSuccessful;
#end
#interface PlayerManager : NSObject<AVAudioPlayerDelegate,AVAudioSessionDelegate>
{
id <ProcessDataDelegate> delegate;
}
+ (PlayerManager *)sharedAudioPlayer;
#property (nonatomic,assign) id <ProcessDataDelegate>delegate;
#property (nonatomic, strong) AVAudioPlayer* player;
-(void)preparesong:(NSURL *)url;
-(void)stopsong;
-(void)pause;
-(void)playsong;
-(void)prepareToPlay;
-(BOOL)isPlaying;
-(BOOL)isPlayerExist;
#end
PlayerManager.m
#import "PlayerManager.h"
#interface PlayerManager()
#end
#implementation PlayerManager
#synthesize player;
#synthesize delegate;
static PlayerManager *sharedAudioPlayer = nil;
+ (PlayerManager *)sharedAudioPlayer {
static PlayerManager *sharedAudioPlayer = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
sharedAudioPlayer = [[self alloc] init];
});
return sharedAudioPlayer ;
}
- (void)audioPlayerEndInterruption:(AVAudioPlayer *)player withOptions:(NSUInteger)flags
{
if (flags & AVAudioSessionInterruptionOptionShouldResume)
{
[self.player play];
}
}
- (void)audioPlayerBeginInterruption:(AVAudioPlayer *)player
{
}
#pragma mark - AVAudioPlayerDelegate
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag
{
[[self delegate] processSuccessful];
}
- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error
{
}
-(void)preparesong:(NSURL *)url
{
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
NSError *error;
self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
if(!self.player)
{
NSLog(#"Error creating player: %#", error);
}
self.player.delegate = self;
[self.player prepareToPlay];
}
-(BOOL)isPlayerExist
{
if (player)
return YES;
return NO;
}
-(BOOL)isPlaying
{
if (player && player.playing)
return YES;
return NO;
}
-(void)prepareToPlay
{
if (player)
[self.player prepareToPlay];
}
-(void)playsong
{
if (player)
[self.player play];
}
-(void)pause
{
if (player.playing)
[self.player pause];
}
-(void)stopsong
{
if (player)
[self.player stop];
}
#end
downloadPlay.h
#import <UIKit/UIKit.h>
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVFoundation.h>
#import "PlayerManager.h"
#interface downloadPlay: UIViewController <UITableViewDelegate,AVAudioPlayerDelegate,ProcessDataDelegate>
{
PlayerManager *protocolPlay;
}
#property (retain, nonatomic) IBOutlet UITableView *tblFiles;
......
- (void)startPlay:(id)sender;
........
#end
downloadPlay.m
import "downloadPlay.h"
#import "PlayerManager.h"
#interface downloadPlay ()
#end
#implementation downloadPlay
.....
- (void)processSuccessful
{
NSLog(#"This method suppose to be called from the method audioPlayerDidFinishPlaying - from PlayerManager");
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
protocolPlay = [[PlayerManager alloc]init];
[protocolPlay setDelegate:self];
}
- (void)startPlay
{
............
.........
NSURL *destinationURL = [self.docDirectoryURL URLByAppendingPathComponent:filename];
NSError* error = nil;
[[PlayerManager sharedAudioPlayer]stopsong];
[[PlayerManager sharedAudioPlayer ] preparesong:destinationURL ];
[[PlayerManager sharedAudioPlayer]playsong];
}
#end

Answer 1

In viewDidLoad method you are creating a different object by using
protocolPlay = [[PlayerManager alloc]init];
line and set the delegate of this object while you have to set the delegate of shared object.
Solution is:
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[[PlayerManager sharedAudioPlayer] setDelegate:self];
}