1.效果图
Untitled3.gif
2.注意点
导入头文件
#import <AVFoundation/AVFoundation.h>
3.代码展示
@interface ViewController ()
{
NSTimer *_timer; //定时器
NSInteger countDown; //倒计时
NSString *filePath;
}
@property (weak, nonatomic) IBOutlet UILabel *noticelobel;
@property (nonatomic, strong) AVAudioSession *session;
@property (nonatomic, strong) AVAudioRecorder *recorder;//录音器
@property (nonatomic, strong) AVAudioPlayer *player; //播放器
@property (nonatomic, strong) NSURL *recordFileUrl; //文件地址
# define COUNTDOWN 60//宏定义
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (IBAction)star:(id)sender {
NSLog(@"开始录音");
countDown = 60;
[self addTimer];
AVAudioSession *session =[AVAudioSession sharedInstance];
NSError *sessionError;
[session setCategory:AVAudioSessionCategoryPlayAndRecord error:&sessionError];
if (session == nil) {
NSLog(@"Error creating session: %@",[sessionError description]);
}else{
[session setActive:YES error:nil];
}
self.session = session;
//1.获取沙盒地址
NSString *path = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
filePath = [path stringByAppendingString:@"/RRecord.wav"];
//2.获取文件路径
self.recordFileUrl = [NSURL fileURLWithPath:filePath];
//设置参数
NSDictionary *recordSetting = [[NSDictionary alloc] initWithObjectsAndKeys:
//采样率 8000/11025/22050/44100/96000（影响音频的质量）
[NSNumber numberWithFloat: 8000.0],AVSampleRateKey,
// 音频格式
[NSNumber numberWithInt: kAudioFormatLinearPCM],AVFormatIDKey,
//采样位数 8、16、24、32 默认为16
[NSNumber numberWithInt:16],AVLinearPCMBitDepthKey,
// 音频通道数 1 或 2
[NSNumber numberWithInt: 1], AVNumberOfChannelsKey,
//录音质量
[NSNumber numberWithInt:AVAudioQualityHigh],AVEncoderAudioQualityKey,
nil];
_recorder = [[AVAudioRecorder alloc] initWithURL:self.recordFileUrl settings:recordSetting error:nil];
if (_recorder) {
_recorder.meteringEnabled = YES;
[_recorder prepareToRecord];
[_recorder record];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(60 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self stop:nil];
});
}else{
NSLog(@"音频格式和文件存储格式不匹配,无法初始化Recorder");
}
}
- (IBAction)stop:(id)sender {
[self removeTimer];
NSLog(@"停止录音");
if ([self.recorder isRecording]) {
[self.recorder stop];
}
NSFileManager *manager = [NSFileManager defaultManager];
if ([manager fileExistsAtPath:filePath]){
_noticelobel.text = [NSString stringWithFormat:@"录了 %ld 秒,文件大小为 %.2fKb",COUNTDOWN - (long)countDown,[[manager attributesOfItemAtPath:filePath error:nil] fileSize]/1024.0];
}else{
_noticelobel.text = @"最多录60秒";
}
}
- (IBAction)action:(id)sender {
NSLog(@"播放录音");
[self.recorder stop];
if ([self.player isPlaying])return;
self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:self.recordFileUrl error:nil];
NSLog(@"%li",self.player.data.length/1024);
[self.session setCategory:AVAudioSessionCategoryPlayback error:nil];
[self.player play];
}
/**
* 添加定时器
*/
- (void)addTimer
{
_timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(refreshLabelText) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:_timer forMode:NSRunLoopCommonModes];
}
/**
* 移除定时器
*/
- (void)removeTimer
{
[_timer invalidate];
_timer = nil;
}
-(void)refreshLabelText{
countDown --;
_noticelobel.text = [NSString stringWithFormat:@"还剩 %ld 秒",(long)countDown];
}
