objective-c – 播放暂停的AVAudioRecorder文件

#import <UIKit/UIKit.h>
 #import <AVFoundation/AVFoundation.h>
 #import <CoreAudio/CoreAudioTypes.h>

   @interface record_audio_testViewController : UIViewController <AVAudioRecorderDelegate> {

IBOutlet UIButton * btnStart;
IBOutlet UIButton * btnPlay;
IBOutlet UIActivityIndicatorView * actSpinner;
BOOL toggle;

//Variables setup for access in the class:
NSURL * recordedTmpFile;
AVAudioRecorder * recorder;
NSError * error;

 }

 @property (nonatomic,retain)IBOutlet UIActivityIndicatorView * actSpinner;
 @property (nonatomic,retain)IBOutlet UIButton * btnStart;
 @property (nonatomic,retain)IBOutlet UIButton * btnPlay;

 - (IBAction) start_button_pressed;
 - (IBAction) play_button_pressed;
 @end

RecordAudioViewController.m

@synthesize actSpinner,btnStart,btnPlay;
   - (void)viewDidLoad {
    [super viewDidLoad];

//Start the toggle in true mode.
toggle = YES;
btnPlay.hidden = YES;

//Instanciate an instance of the AVAudioSession object.
AVAudioSession * audioSession = [AVAudioSession sharedInstance];
//Setup the audioSession for playback and record. 
//We could just use record and then switch it to playback leter,but
//since we are going to do both lets set it up once.
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error: &error];
//Activate the session
[audioSession setActive:YES error: &error];

  }


 - (IBAction)  start_button_pressed{

if(toggle)
{
    toggle = NO;
    [actSpinner startAnimating];
    [btnStart setTitle:@"Stop Recording" forState: UIControlStateNormal ];  
    btnPlay.enabled = toggle;
    btnPlay.hidden = !toggle;

    //Begin the recording session.
    //Error handling removed.  Please add to your own code.

    //Setup the dictionary object with all the recording settings that this 
    //Recording sessoin will use
    //Its not clear to me which of these are required and which are the bare minimum.
    //This is a good resource: http://www.totodotnet.net/tag/avaudiorecorder/
    NSMutableDictionary* recordSetting = [[NSMutableDictionary alloc] init];
    [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; 
    [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

    //Now that we have our settings we are going to instanciate an instance of our recorder instance.
    //Generate a temp file for use by the recording.
    //This sample was one I found online and seems to be a good choice for making a tmp file that
    //will not overwrite an existing one.
    //I know this is a mess of collapsed things into 1 call.  I can break it out if need be.
    recordedTmpFile = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent: [NSString stringWithFormat: @"%.0f.%@",[NSDate timeIntervalSinceReferenceDate] * 1000.0,@"caf"]]];
    NSLog(@"Using File called: %@",recordedTmpFile);
    //Setup the recorder to use this file and record to it.
    recorder = [[ AVAudioRecorder alloc] initWithURL:recordedTmpFile settings:recordSetting error:&error];
    //Use the recorder to start the recording.
    //Im not sure why we set the delegate to self yet.  
    //Found this in antother example,but Im fuzzy on this still.
    [recorder setDelegate:self];
    //We call this to start the recording process and initialize 
    //the subsstems so that when we actually say "record" it starts right away.
    [recorder prepareToRecord];
    //Start the actual Recording
    [recorder record];
    //There is an optional method for doing the recording for a limited time see 
    //[recorder recordForDuration:(NSTimeInterval) 10]

}
else
{
    toggle = YES;
    [actSpinner stopAnimating];
    [btnStart setTitle:@"Start Recording" forState:UIControlStateNormal ];
    btnPlay.enabled = toggle;
    btnPlay.hidden = !toggle;

    NSLog(@"Using File called: %@",recordedTmpFile);
    //Stop the recorder.
    [recorder stop];
}
  }

  - (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data,images,etc that aren't in use.
  }

  -(IBAction) play_button_pressed{

//The play button was pressed... 
//Setup the AVAudioPlayer to play the file that we just recorded.
AVAudioPlayer * avPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:recordedTmpFile error:&error];
[avPlayer prepareToPlay];
[avPlayer play];

  }

   - (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
//Clean up the temp file.
NSFileManager * fm = [NSFileManager defaultManager];
[fm removeItemAtPath:[recordedTmpFile path] error:&error];
//Call the dealloc on the remaining objects.
[recorder dealloc];
recorder = nil;
recordedTmpFile = nil;
  }


  - (void)dealloc {
[super dealloc];
  }

 @end

RecordAudioViewController.xib

拿2个按钮. 1用于开始录制,另一个用于播放录制