录音与播放

#import "ViewController.h"
//导入AVFoundation框架
#import <AVFoundation/AVFoundation.h>
@interface ViewController ()
{
NSURL *recordURL;
AVAudioPlayer *player;
AVAudioRecorder *recorder;
}
@end

@implementation ViewController

设置button状态为UIControlEventTouchDown开始录音

- (IBAction)startRecord:(UIButton *)sender {
//把之前录音机设为空
recorder = nil;
//删除已有的声音文件
NSFileManager *manager = [NSFileManager defaultManager];
//通过地址
[manager removeItemAtURL:_soundFileURL error:nil];
//把音频回话设置为录音模式
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:nil];
//创建设置
/*
1 声音的格式
2 采样率
3 声道数 2
4 采样位数
5 内存的组织方式（大端，小端）
6 编码质量
*/
NSDictionary *setting = @{AVFormatIDKey : [NSNumber numberWithInt:kAudioFormatMPEG4AAC],
AVSampleRateKey : @1000,
AVNumberOfChannelsKey : @2,
AVLinearPCMBitDepthKey : @16,
AVLinearPCMIsBigEndianKey : @NO,
AVLinearPCMIsFloatKey : @NO,
AVEncoderAudioQualityKey : [NSNumber numberWithInt:AVAudioQualityMedium]
};
//创建录音器
recorder = [[AVAudioRecorder alloc] initWithURL:recordURL settings:setting error:nil];
[recorder prepareToRecord];
//录音器开始录音
[recorder record];
}

设置button状态为UIControlEventTouchUpInside停止录音

- (IBAction)stopRecord:(UIButton *)sender {
//停止录音,是录音机停止
[recorder stop];
//把录音机设为空
recorder = nil;
//还原音频会话为播放模式
[[AVAudioSession sharedInstance]setCategory:AVAudioSessionCategorySoloAmbient error:nil];
}

播放录音

- (IBAction)playRecord:(UIButton *)sender {
//把之前播放器设为空
player = nil;
//创建播放器
player = [[AVAudioPlayer alloc] initWithContentsOfURL:recordURL error:nil];
[player prepareToPlay];
[player play];
}

- (void)viewDidLoad {
[super viewDidLoad];
//创建录音文件
NSString *recordString = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/sound.acc"];
//获取文件地址
recordURL = [NSURL fileURLWithPath:recordString];

}

@end