Can't permanently save audio with AVAudioRecorder - iphone

Question

An app i'm making has several views, each view has a record, stop and play button. The idea is that the user can record to a different sound file for each view.
I can record and playback a sound on each view but when i navigate away from the view and then navigate back the sound is gone.
I'm sorry to include so much code below but it's something i need to get to the bottom of.
Delegate.h
#import <UIKit/UIKit.h>
#import <AudioToolbox/AudioServices.h>
#import <AVFoundation/AVFoundation.h>
#interface humptyDumptyAppDelegate : UIResponder <UIApplicationDelegate>
{
NSArray *dirPaths;
NSString *docsDir;
NSString *soundFilePathPage1;
NSString *soundFilePathPage2;
NSString *soundFilePathPage3;
NSString *soundFilePathPage4;
NSString *soundFilePathPage5;
NSString *soundFilePathPage6;
}
#property (strong, nonatomic) UIWindow *window;
#property (strong, nonatomic) AVAudioRecorder *audioRecorder;
#property (strong, nonatomic) AVAudioPlayer *audioPlayer;
//example getter and setter functions
- (NSArray*) getDirPaths;
- (void) setDirPaths:(NSArray*)myDirPath;
- (NSString*) getDocsDir;
- (NSString*) soundFilePathForPageNumber:(int)pageNumber;
#end
Delegate.m
#import "humptyDumptyAppDelegate.h"
#implementation humptyDumptyAppDelegate
#synthesize window = _window;
#synthesize audioPlayer;
#synthesize audioRecorder;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
soundFilePathPage1 = [docsDir
stringByAppendingPathComponent:#"audiopage1.caf"];
soundFilePathPage2 = [docsDir
stringByAppendingPathComponent:#"page2.caf"];
soundFilePathPage3 = [docsDir
stringByAppendingPathComponent:#"page3.caf"];
soundFilePathPage4 = [docsDir
stringByAppendingPathComponent:#"page4.caf"];
soundFilePathPage5 = [docsDir
stringByAppendingPathComponent:#"page5.caf"];
soundFilePathPage6 = [docsDir
stringByAppendingPathComponent:#"page6.caf"];
return YES;
}
//getter function
- (NSArray*) getDirPaths{
return dirPaths;
}
//setter function
- (void) setDirPaths:(NSArray*)myDirPath{
dirPaths = myDirPath;
}
// get docs directory
-(NSString*) getDocsDir{
return docsDir;
}
// get sound file for page, passing the page number as an argument
-(NSString*) soundFilePathForPageNumber:(int)pageNumber{
switch (pageNumber) {
case 1:
return soundFilePathPage1;
break;
case 2:
return soundFilePathPage2;
break;
case 3:
return soundFilePathPage3;
break;
case 4:
return soundFilePathPage4;
break;
case 5:
return soundFilePathPage5;
break;
case 6:
return soundFilePathPage6;
break;
}
return nil;
}
page1.m
//this is called in viewDidLoad
-(void) prepareForAudioRecording
{
btnPlay.enabled = NO;
btnStop.enabled = NO;
int page = 1;
NSString *audioFilePath = [appDelegate soundFilePathForPageNumber:page];
NSURL *soundFileURL = [NSURL fileURLWithPath:audioFilePath];
NSError *error;
NSDictionary *recordSettings = [NSDictionary
dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:AVAudioQualityMin],
AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
[NSNumber numberWithInt: 2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:44100.0],
AVSampleRateKey,
nil];
appDelegate.audioRecorder = [[AVAudioRecorder alloc]
initWithURL:soundFileURL
settings:recordSettings
error:&error];
if (error)
{
NSLog(#"error: %#", [error localizedDescription]);
} else {
[appDelegate.audioRecorder prepareToRecord];
}
}
- (IBAction)recordAudio:(id)sender {
if (!appDelegate.audioRecorder.recording)
{
btnPlay.enabled = NO;
btnStop.enabled = YES;
[appDelegate.audioRecorder record];
}
}
- (IBAction)stopAudio:(id)sender {
btnStop.enabled = NO;
btnPlay.enabled = YES;
btnRecord.enabled = YES;
if (appDelegate.audioRecorder.recording)
{
[appDelegate.audioRecorder stop];
[self audioRecorderDidFinishRecording:appDelegate.audioRecorder successfully:YES];
} else if (appDelegate.audioPlayer.playing) {
[appDelegate.audioPlayer stop];
}
}
-(void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag
{
if (flag == YES){
NSLog(#"finished recording");
[appDelegate.audioPlayer.data writeToFile:[appDelegate soundFilePathForPageNumber:1] atomically:YES];
}
}
Like i said, i'm sorry for the amount of code included, but i'm unsure where the problem is. I'm calling the writeToFile method in the audioRecorderDidFinishRecording: method. I don't know if this is correct but i have a feeling that this is not the root of the problem.
Please help!!

Answer 1

this code saves to an audio file
what about copping the file to the documents directory
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:#" sound.caf"];
success = [fileManager fileExistsAtPath:writableDBPath];
if (!success){
// The writable database does not exist, so copy the default to the appropriate location.
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"sound.caf"];
success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
NSError *attributesError;
NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:writableDBPath error:&attributesError];
NSNumber *fileSizeNumber = [fileAttributes objectForKey:NSFileSize];
long long fileSize = [fileSizeNumber longLongValue];
NSLog(#"file size: %lld",fileSize);
if (!success) {
NSLog(#"Failed to create writable database file with message: %#", [error localizedDescription]);
}
}

Answer 2

It turns out the problem was that in one of my pages i had my prepareForAudioRecording in viewDidAppear which was automatically overwriting the saved audio. Moving it to viewDidLoad did the trick