iOS 语音录制及播放，类似微信手势脱出取消，拖回继续录制。

下面代码，后面有链接

用到的内容有：

AVFoundation 系统支持库

AVAudioSession 判断使用麦克风权限及设置声音录入、输出渠道（）

AVAudioRecorder 录音器

NSTimer 计时器，根据音量大小修改展示图片内容

代码：

//
//  ViewController.m
//  recordSound
//

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

#define WIDTH [UIScreen mainScreen].bounds.size.width

#define HEIGHT [UIScreen mainScreen].bounds.size.height

@interface ViewController ()

@property (nonatomic,strong)AVAudioSession * session;

@property (nonatomic,strong)AVAudioRecorder * record;

@property (nonatomic,assign)NSTimer * timer;

@property (nonatomic,copy)NSString *filePath;

@property (nonatomic,strong)AVAudioPlayer * player;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];

[self createUI];
// Do any additional setup after loading the view, typically from a nib.
}

-(void)createUI{

self.view.backgroundColor = [UIColor whiteColor];

UIButton * button = [UIButton buttonWithType:UIButtonTypeCustom];

button.frame = CGRectMake(30, HEIGHT-100, (WIDTH-90)/2, 40);

[button setTitle:@"按住录音" forState:UIControlStateNormal];

button.backgroundColor = [UIColor blackColor];

button.layer.cornerRadius = 20;

button.clipsToBounds = YES;

/*

UIControlEventTouchDown 按下

UIControlEventTouchCancel 意外取消

UIControlEventTouchUpInside 点击

UIControlEventTouchDragExit 拖出

UIControlEventTouchUpOutside 手势外部抬起

UIControlEventTouchDragEnter 拖回

*/
[button addTarget:self action:@selector(voiceBtnClickDown:) forControlEvents:UIControlEventTouchDown];
[button addTarget:self action:@selector(voiceBtnClickCancel:) forControlEvents:UIControlEventTouchCancel];
[button addTarget:self action:@selector(voiceBtnClickUpInside:) forControlEvents:UIControlEventTouchUpInside];
[button addTarget:self action:@selector(voiceBtnClickDragExit:) forControlEvents:UIControlEventTouchDragExit];
[button addTarget:self action:@selector(voiceBtnClickUpOutside:) forControlEvents:UIControlEventTouchUpOutside];
[button addTarget:self action:@selector(voiceBtnClickDragEnter:) forControlEvents:UIControlEventTouchDragEnter];

[self.view addSubview:button];

UIButton * playButton = [UIButton buttonWithType:UIButtonTypeCustom];

playButton.frame = CGRectMake((WIDTH-90)/2+60, HEIGHT-100, (WIDTH-90)/2, 40);

[playButton setTitle:@"播放" forState:UIControlStateNormal];

playButton.backgroundColor = [UIColor blackColor];
playButton.layer.cornerRadius = 20;
playButton.clipsToBounds = YES;

[playButton addTarget:self action:@selector(playVoice) forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:playButton];

_filePath=[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];

NSString *name = [NSString stringWithFormat:@"%d.wav",(int)[NSDate date].timeIntervalSince1970];
_filePath=[_filePath stringByAppendingPathComponent:name];

}

//播放声音
-(void)playVoice{

if ([_player isPlaying]) {
[_player stop];
_player = nil;
}

_player = [[AVAudioPlayer alloc]initWithContentsOfURL:[NSURL fileURLWithPath:_filePath] error:nil];

if ([_player isPlaying]) {
return;
}

[_player play];

}

-(void)voiceBtnClickDown:(UIButton *)btn{//按下

if ([_player isPlaying]) {
[_player stop];
_player = nil;
}

NSLog(@"按下");

[btn setTitle:@"松开完成" forState:UIControlStateNormal];

NSURL *url=[NSURL fileURLWithPath:_filePath];

NSDictionary * dict = @{AVFormatIDKey:@(kAudioFormatLinearPCM),
AVSampleRateKey:@(8000),
AVNumberOfChannelsKey:@(1),
AVLinearPCMBitDepthKey:@(8),
AVLinearPCMIsFloatKey:@(YES)
};

if (!_session) {
_session = [AVAudioSession sharedInstance];

if ([_session respondsToSelector:@selector(requestRecordPermission:)]) {
[_session performSelector:@selector(requestRecordPermission:) withObject:^(BOOL isTrue){
if (isTrue) {
}else{
NSLog(@"app需要访问您的麦克风。");
}

}];
}
[_session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
}

_record = [[AVAudioRecorder alloc]initWithURL:url settings:dict error:nil];
_record.meteringEnabled = YES;//监听音量大小
[_record prepareToRecord];
[_record record];

UIView * recordView = [[UIView alloc]initWithFrame:CGRectMake(WIDTH/2-100, HEIGHT/2-100, 200, 200)];

recordView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.6];
recordView.tag = 101;

UIImageView * micImg = [[UIImageView alloc]initWithFrame:CGRectMake(WIDTH*50/720, HEIGHT*66/1280,WIDTH*280/720, HEIGHT*200/1280)];
micImg.contentMode = UIViewContentModeLeft;
[micImg setImage:[UIImage imageNamed:@"chat_microphone_1"]];
micImg.backgroundColor = [UIColor clearColor];
micImg.tag = 135;

_timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(voiceChange:) userInfo:nil repeats:YES];

UIImageView * micImgCan = [[UIImageView alloc]initWithFrame:CGRectMake(WIDTH*120/720, HEIGHT*66/1280,WIDTH*140/720, HEIGHT*200/1280)];
micImgCan.backgroundColor = [UIColor clearColor];
micImgCan.image = [UIImage imageNamed:@"chat_microphone_cancel"];
micImgCan.tag = 134;

UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(20, CGRectGetMaxY(micImg.frame)+HEIGHT*60/1280, 160, HEIGHT*60/1280)];
label.tag = 136;
label.textAlignment = NSTextAlignmentCenter;
label.textColor = [UIColor whiteColor];
label.text = @"手指上滑,取消发送";

micImgCan.hidden = YES;
micImg.hidden = NO;

[recordView addSubview:label];
[recordView addSubview:micImg];
[recordView addSubview:micImgCan];

[self.view addSubview:recordView];
}

-(void)voiceChange:(NSTimer *)timer{

UIView * view = [self.view viewWithTag:101];

UIImageView * micImg = [view viewWithTag:135];

[_record updateMeters];//刷新音量数据

CGFloat lowPassResults = pow(10, (0.05 * [_record peakPowerForChannel:0]));

//    NSLog(@"lowPassResults = %f",lowPassResults);

//  根据音量大小选择显示图片  图片 小-》大
if (0<lowPassResults<=0.14) {
[micImg setImage:[UIImage imageNamed:@"chat_microphone_1"]];
}else if (0.14<lowPassResults<=0.28) {
[micImg setImage:[UIImage imageNamed:@"chat_microphone_2"]];
}else if (0.28<lowPassResults<=0.42) {
[micImg setImage:[UIImage imageNamed:@"chat_microphone_3"]];
}else if (0.42<lowPassResults<=0.56) {
[micImg setImage:[UIImage imageNamed:@"chat_microphone_4"]];
}else if (0.56<lowPassResults<=0.70) {
[micImg setImage:[UIImage imageNamed:@"chat_microphone_5"]];
}else if (0.70<lowPassResults<=0.84) {
[micImg setImage:[UIImage imageNamed:@"chat_microphone_6"]];
}else if (0.84<lowPassResults) {
[micImg setImage:[UIImage imageNamed:@"chat_microphone_7"]];
}

}

-(void)voiceBtnClickCancel:(UIButton *)btn{//意外取消
NSLog(@"意外取消");
[btn setTitle:@"松开完成" forState:UIControlStateNormal];

UIView * view = [self.view viewWithTag:101];
[view removeFromSuperview];

if ([_record isRecording]) {
[_record stop];
[_record deleteRecording];
}

_record = nil;

if (_timer.isValid) {//判断timer是否在线程中
[_timer invalidate];
}
_timer=nil;

}
-(void)voiceBtnClickUpInside:(UIButton *)btn{//点击(录音完成)
NSLog(@"点击");
[btn setTitle:@"按住录音" forState:UIControlStateNormal];

UIView * view = [self.view viewWithTag:101];
[view removeFromSuperview];

[_record stop];

if (_timer.isValid) {
[_timer invalidate];
}
_timer=nil;

}
-(void)voiceBtnClickDragExit:(UIButton *)btn{//拖出
NSLog(@"拖出");

[btn setTitle:@"按住录音" forState:UIControlStateNormal];

UIView * view = [self.view viewWithTag:101];

UIImageView * micImg = [view viewWithTag:135];
micImg.hidden = YES;

UIImageView * micImgCan = [view viewWithTag:134];
micImgCan.hidden = NO;

UILabel * alertLab = [view viewWithTag:136];
alertLab.backgroundColor = [UIColor colorWithRed:255/255.0 green:128/255.0 blue:158/255.0 alpha:1];

}
-(void)voiceBtnClickUpOutside:(UIButton *)btn{//外部手势抬起
NSLog(@"外部手势抬起");

[btn setTitle:@"按住录音" forState:UIControlStateNormal];

UIView * view = [self.view viewWithTag:101];
[view removeFromSuperview];

if ([_record isRecording]) {

[_record stop];
[_record deleteRecording];

}
_record = nil;

if (_timer.isValid) {
[_timer invalidate];
}
_timer=nil;

}

-(void)voiceBtnClickDragEnter:(UIButton *)btn{//拖回
NSLog(@"拖回");

[btn setTitle:@"松开完成" forState:UIControlStateNormal];

UIView * view = [self.view viewWithTag:101];

UIImageView * micImg = [view viewWithTag:135];
micImg.hidden = NO;

UIImageView * micImgCan = [view viewWithTag:134];
micImgCan.hidden = YES;

UILabel * alertLab = [view viewWithTag:136];
alertLab.backgroundColor = [UIColor clearColor];

}

@end

链接：https://github.com/cwos111509sina/RecordSoundText.git