如何在iPhone应用程序中录制和播放声音？

#import <AudioToolbox/AudioServices.h>

    UInt32 audioRouteOverride = kAudioSessionOverrideAudioRoute_Speaker;                
    AudioSessionSetProperty (kAudioSessionProperty_OverrideAudioRoute,          
                                 sizeof (audioRouteOverride),&audioRouteOverride);  

NSError *setOverrideError;
NSError *setCategoryError;

AVAudioSession *session = [AVAudioSession sharedInstance];
[session setCategory:AVAudioSessionCategoryPlayAndRecord error:&setCategoryError];

if(setCategoryError){
    NSLog(@\"%@\", [setCategoryError description]);
}

[session overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:&setOverrideError];


if(setOverrideError){
    NSLog(@\"%@\", [setOverrideError description]);
}

 import AVFoundation
 var overrideError : NSError?
    if AVAudioSession.sharedInstance().overrideOutputAudioPort(.Speaker, error: &error){

    }else{
        print(\"error in overrideOutputAudioPort \" + overrideError!.localizedDescription)
    }

        do {
        try AVAudioSession.sharedInstance().overrideOutputAudioPort(AVAudioSessionPortOverride.Speaker)
        } catch {
        }

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error: nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
UInt32 doChangeDefault = 1;
AudioSessionSetProperty(kAudioSessionProperty_OverrideCategoryDefaultToSpeaker, sizeof(doChangeDefault), &doChangeDefault);

AVAudioSession *session = [AVAudioSession sharedInstance];

NSError *setCategoryError = nil;
if (![session setCategory:AVAudioSessionCategoryPlayback
              withOptions:kAudioSessionOverrideAudioRoute_Speaker
                    error:&setCategoryError]) {
        // handle error
}

NSError *error;
NSData * data = [NSData dataWithContentsOfURL:self.playlet.urlSound];

self.audioPlayer = [[AVAudioPlayer alloc] initWithData:data fileTypeHint:@\"aac\" error:&error];

self.audioPlayer.delegate = self;

if (error)
    NSLog(@\"Error: %@\",
          [error localizedDescription]);
else
    [_audioPlayer play];