新建Empty Applicaton,添加HomeViewController文件。还是看代码吧，将理论太枯燥，理论在代码中会提到。
HomeViewController.h代码：
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface HomeViewController : UIViewController
<AVAudioRecorderDelegate, AVAudioPlayerDelegate>{
}
@property (nonatomic, retain) AVAudioRecorder *audioRecorder;
@property (nonatomic, retain) AVAudioPlayer *audioPlayer;
- (NSString *)audioRecordingPath;
- (NSDictionary *)audioRecordingSettings;
@end
HomeViewController.m代码：
#import "HomeViewController.h"
@interface HomeViewController ()
@end
@implementation HomeViewController
@synthesize audioPlayer;
@synthesize audioRecorder;
//设置录制的音频文件的位置
- (NSString *)audioRecordingPath{
NSString *result = nil;
NSArray *folders = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsFolde = [folders objectAtIndex:0];
result = [documentsFolde stringByAppendingPathComponent:@"Recording.m4a"];
return (result);
}
//在初始化AVAudioRecord实例之前，需要进行基本的录音设置
- (NSDictionary *)audioRecordingSettings{
NSDictionary *result = nil;
NSMutableDictionary *settings = [[[NSMutableDictionary alloc] init] autorelease];//录音时所必需的参数设置
[settings setValue:[NSNumber numberWithInteger:kAudioFormatAppleLossless]
forKey:AVFormatIDKey];
[settings setValue:[NSNumber numberWithFloat:44100.0f] forKey:AVSampleRateKey];
[settings setValue:[NSNumber numberWithInteger:1] forKey:AVNumberOfChannelsKey];
[settings setValue:[NSNumber numberWithInteger:AVAudioQualityLow]
forKey:AVEncoderAudioQualityKey];
result = [NSDictionary dictionaryWithDictionary:settings];
return (result);
}
//停止音频的录制
- (void)stopRecordingOnAudioRecorder:(AVAudioRecorder *)recorder{
[recorder stop];
}
//当AVAudioRecorder对象录音终止的时候会调用audioRecorderDidFinishRecording:successfully:方法
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag{
//如果flag为真，代表录音正常结束，使用AVAudioPlayer将其播放出来，否则日志记录失败原因
if (flag == YES) {
NSLog(@"录音完成！");
NSError *playbackError = nil;
NSError *readingError = nil;
NSData *fileData = [NSData dataWithContentsOfFile:[self audioRecordingPath] options:NSDataReadingMapped error:&readingError];
AVAudioPlayer *newPlayer = [[AVAudioPlayer alloc] initWithData:fileData
error:&playbackError];
self.audioPlayer = newPlayer;
[newPlayer release];
if (self.audioPlayer != nil) {
self.audioPlayer.delegate = self;
if ([self.audioPlayer prepareToPlay] == YES &&
[self.audioPlayer play] == YES) {
NSLog(@"开始播放录制的音频！");
} else {
NSLog(@"不能播放录制的音频！");
}
}else {
NSLog(@"音频播放失败！");
}
} else {
NSLog(@"录音过程意外终止！");
}
self.audioRecorder = nil;
}
- (void)viewDidLoad
{
[super viewDidLoad];
NSError *error = nil;
NSString *pathOfRecordingFile = [self audioRecordingPath];
NSURL *audioRecordingUrl = [NSURL fileURLWithPath:pathOfRecordingFile];
AVAudioRecorder *newRecorder = [[AVAudioRecorder alloc]
initWithURL:audioRecordingUrl
settings:[self audioRecordingSettings]
error:&error];
self.audioRecorder = newRecorder;
[newRecorder release];
if (self.audioRecorder != nil) {
self.audioRecorder.delegate = self;
if ([self.audioRecorder prepareToRecord] == YES &&
[self.audioRecorder record] == YES) {
//如果audioRecorder实例化成功，则开始录制声音，并且通过performSelector方法设置在录制声音10s以后执行stopRecordingOnAudioRecorder方法，用于停止录音
NSLog(@"录制声音开始！");
[self performSelector:@selector(stopRecordingOnAudioRecorder:)
withObject:self.audioRecorder
afterDelay:10.0f];
} else {
NSLog(@"录制失败！");
self.audioRecorder =nil;
}
} else {
NSLog(@"auioRecorder实例创建失败！");
}
}
- (void)viewDidUnLoad{
if (self.audioRecorder != nil) {
if ([self.audioRecorder isRecording] == YES) {
[self.audioRecorder stop];
}
self.audioRecorder = nil;
}
if (self.audioPlayer != nil) {
if ([self.audioPlayer isPlaying] == YES) {
[self.audioPlayer stop];
}
self.audioPlayer = nil;
}
}
- (void)dealloc{
[audioPlayer release];
[audioRecorder release];
[super dealloc];
}
@end
PS: 录制音频时所必需的参数设置
AVFormatIDKey 录制音频的格式。
kAudioFormatLinearPCM: lpcm格式
kAudioFormatAC3: ac-3格式
kAudioFormatMPEG4AAC: aac格式
kAudioFormatMPEG4CELP: celp格式
kAudioFormatMPEG4HVXC: hvxc格式
kAudioFormatMPEG4Layer1: mp1格式
kAudioFormatMPEG4Layer2: mp2 格式
kAudioFormatMPEG4Layer3: mp3 格式
kAudioFormatTimeCode: time格式
kAudioFormatMIDIStream: midi格式
kAudioFormatAppleLossless：alac格式
AVSampleRateKey 录制音频时的采用视频
AVNumberOfChannelsKey 录制音频时的通道数量
AVEncoderAudioQualityKey 录制音频的质量
AVAudioQualityMin
AVAudioQualityLow
AVAudioQualityMedium
AVAudioQualityHigh
AVAudioQualityMax