IOS 利用麦克风声音来实现吹裙子的动画效果

前言：闲来无事帮别人写的，利用麦克风声音来实现吹裙子的动画效果，因为录下来的东西不需要播放，所以在停止录音的同时删除文件。

大致步骤：

1、首先需要在plist文件中添加Privacy - Microphone Usage Description这个key值；

2、导入AVFoundation框架；

3、初始化录音实例：

3.1、设置录音文件存放路径；

3.2、录音配置；

3.3、开启监控声波设置；

4、开始录音；

5、添加计时器；

6、停止录音；

7、销毁计时器；

8、删除文件；

demo实现代码：

#import "BlowSkirtVC.h"
#import <AVFoundation/AVFoundation.h>

//图片个数
static const NSInteger KImageCount = 20;
static const CGFloat KDurationLevel = 0.05;
//录音文件存放路径
#define KRecorderFilePath [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:@"play.aac"]

@interface BlowSkirtVC ()

//录音实例
@property (nonatomic,strong) AVAudioRecorder *recorder;
//定时器
@property (nonatomic,strong) NSTimer *levelTimer;
//图片实例
@property (nonatomic,strong) UIImageView *imageV;
//图片数组
@property (nonatomic,strong) NSMutableArray *imageArray;

@property (nonatomic,assign)  double lowPassResults;

@end

@implementation BlowSkirtVC

- (void)viewDidLoad {
[super viewDidLoad];

//1.添加图片
[self addImageView];

//2.添加按钮
[self addRecorderBtn];
}

#pragma mark 添加图片视图
- (void)addImageView
{
[self.view addSubview:self.imageV];
}

#pragma mark 添加按钮
- (void)addRecorderBtn
{
CGFloat recorderBtnX = CGRectGetMinX(self.imageV.frame);
CGFloat recorderBtnY = CGRectGetMaxY(self.imageV.frame) + 20;
CGFloat recorderBtnW = self.imageV.frame.size.width;
CGFloat recorderBtnH = 44;
UIButton *recorderBtn = [UIButton buttonWithType:UIButtonTypeCustom];
recorderBtn.backgroundColor = [UIColor redColor];
recorderBtn.frame = CGRectMake(recorderBtnX, recorderBtnY, recorderBtnW, recorderBtnH);
[recorderBtn setTitle:@"按住 说话" forState:UIControlStateNormal];
[recorderBtn setTitle:@"松开 结束" forState:UIControlStateHighlighted];
[recorderBtn addTarget:self action:@selector(startRecord) forControlEvents:UIControlEventTouchDown];
[recorderBtn addTarget:self action:@selector(stopRecord) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:recorderBtn];
}

#pragma mark 开启录音
- (void)startRecord
{
//0.判断是否正在录音,如果有则停止
if ([self.recorder isRecording]) {
[self.recorder stop];
}

//1.设置AVAudioSession分类
AVAudioSession *audioSession=[AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryRecord error:nil];

//2.准备录音
[self.recorder prepareToRecord];

//3.开始录音
[self.recorder record];

//4.添加计时器
[self.levelTimer fire];
}

#pragma mark 结束录音
- (void)stopRecord
{
//1.停止录音，并设为nil
[_recorder stop];
_recorder = nil;

//2.停止计时器，并设为nil
[_levelTimer invalidate];
_levelTimer = nil;

//3.恢复图片最初状态
NSInteger currentLevel = _lowPassResults/KDurationLevel;
if (currentLevel > 0) {
//3.1添加数据源
NSMutableArray *animationArray = [NSMutableArray array];
for (int i = 0; i < currentLevel; i ++) {
UIImage *image = _imageArray[currentLevel - i];
[animationArray addObject:image];
}

//3.2设置动画执行后需要现实的图片
_imageV.image = _imageArray.firstObject;
_imageV.animationImages = animationArray;

//3.3重复次数
_imageV.animationRepeatCount = 1;

//3.4执行一次需要的时间
_imageV.animationDuration = 2;

//3.5开始动画
[_imageV startAnimating];

}

//4.删除录音文件，以免数据量太大
[self deleteOldRecordFile];

//5.设置lowPassResults为0
_lowPassResults = 0;
}

- (UIImageView *)imageV
{
if (!_imageV) {
CGFloat imageVW = 200;
CGFloat imageVH = imageVW;
_imageV = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, imageVW, imageVH)];
_imageV.center = self.view.center;
_imageV.image = self.imageArray.firstObject;
}
return _imageV;
}

- (NSMutableArray *)imageArray
{
if (!_imageArray) {
_imageArray = [NSMutableArray array];
for (int i = 0; i < KImageCount; i ++) {
NSString *imageName = [NSString stringWithFormat:@"Blowskirt%d_@2x.jpg",i + 1];
UIImage *image = [UIImage imageNamed:imageName];
[_imageArray addObject:image];
}
}
return _imageArray;
}

- (AVAudioRecorder *)recorder
{
if (!_recorder) {
//1.录音文件存储路径
NSURL *url = [NSURL URLWithString:KRecorderFilePath];
//2.录音设置
NSDictionary *setting = [self getAudioSetting];
//3.实例化对象
NSError *error = nil;
_recorder = [[AVAudioRecorder alloc] initWithURL:url settings:setting error:&error];
//3.1如果要监控声波则必须设置为YES
_recorder.meteringEnabled = YES;
if (error) {
NSLog(@"创建录音机对象时发生错误，错误信息：%@",error.localizedDescription);
return nil;
}
}
return _recorder;
}

#pragma mark 录音配置
-(NSDictionary *)getAudioSetting
{
//录音设置
NSMutableDictionary *recordSettings = [NSMutableDictionary dictionary];
//录音格式
[recordSettings setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
//采样率
[recordSettings setValue:[NSNumber numberWithFloat:11025.0] forKey:AVSampleRateKey];//44100.0
//通道数
[recordSettings setValue:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
//线性采样位数
[recordSettings setValue:[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
//音频质量,采样质量
[recordSettings setValue:[NSNumber numberWithInt:AVAudioQualityMin] forKey:AVEncoderAudioQualityKey];

return recordSettings;
}

- (NSTimer *)levelTimer
{
if (!_levelTimer) {
_levelTimer = [NSTimer scheduledTimerWithTimeInterval:0.03 target:self selector:@selector(levelTimerCallback:) userInfo:nil repeats:YES];
}
return _levelTimer;
}

#pragma mark 计时器执行的方法
- (void)levelTimerCallback:(NSTimer *)timer
{
//1.刷新电平值,-120表示完全安静，0表示最大输入值
[_recorder updateMeters];

//2.获取峰值电平并转化为0-1
const double ALPHA = 0.05;
double peakPowerForChannel = pow(10, (0.05 * [self.recorder peakPowerForChannel:0]));
_lowPassResults = ALPHA * peakPowerForChannel + (1.0 - ALPHA) * _lowPassResults;

NSLog(@"Average input: %f Peak input: %f Low pass results: %f", [self.recorder averagePowerForChannel:0], [self.recorder peakPowerForChannel:0], _lowPassResults);

//3.根据值转换为对应的等级的图片，此处以0.05为划分
NSInteger currentLevel = _lowPassResults/KDurationLevel;
//3.1防止数组越界
if (currentLevel >= KImageCount - 1) {
currentLevel = KImageCount - 1;
}
_imageV.image = _imageArray[currentLevel];

}

#pragma mark 删除录音文件
- (void)deleteOldRecordFile
{
[self deleteOldRecordFileAtPath:KRecorderFilePath];
}

#pragma mark 删除录音文件(根据相应的路径)
- (void)deleteOldRecordFileAtPath:(NSString *)pathStr
{
NSFileManager* fileManager=[NSFileManager defaultManager];

BOOL blHave=[[NSFileManager defaultManager] fileExistsAtPath:pathStr];
if (!blHave) {
NSLog(@"不存在");
return ;
}else {
NSLog(@"存在");
BOOL blDele= [fileManager removeItemAtPath:pathStr error:nil];
if (blDele) {
NSLog(@"删除成功");
}else {
NSLog(@"删除失败");
}
}
}

@end

demo下载链接：http://download.csdn.net/detail/u011154007/9674248