iOS仿微信相机拍照、视频录制功能

#import <AVFoundation/AVFoundation.h> 
#import <AssetsLibrary/AssetsLibrary.h>

Privacy - Microphone Usage Description 
Privacy - Photo Library Usage Description 
Privacy - Camera Usage Description

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

@interface HAVPlayer ()

@property (nonatomic,strong) AVPlayer *player;//播放器对象

@end

@implementation HAVPlayer

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
 // Drawing code
}
*/

- (instancetype)initWithFrame:(CGRect)frame withShowInView:(UIView *)bgView url:(NSURL *)url {
 if (self = [self initWithFrame:frame]) {
  //创建播放器层
  AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:self.player];
  playerLayer.frame = self.bounds;

  [self.layer addSublayer:playerLayer];
  if (url) {
   self.videoUrl = url;
  }

  [bgView addSubview:self];
 }
 return self;
}

- (void)dealloc {
 [self removeAvPlayerNtf];
 [self stopPlayer];
 self.player = nil;
}

- (AVPlayer *)player {
 if (!_player) {
  _player = [AVPlayer playerWithPlayerItem:[self getAVPlayerItem]];
  [self addAVPlayerNtf:_player.currentItem];

 }

 return _player;
}

- (AVPlayerItem *)getAVPlayerItem {
 AVPlayerItem *playerItem=[AVPlayerItem playerItemWithURL:self.videoUrl];
 return playerItem;
}

- (void)setVideoUrl:(NSURL *)videoUrl {
 _videoUrl = videoUrl;
 [self removeAvPlayerNtf];
 [self nextPlayer];
}

- (void)nextPlayer {
 [self.player seekToTime:CMTimeMakeWithSeconds(0, _player.currentItem.duration.timescale)];
 [self.player replaceCurrentItemWithPlayerItem:[self getAVPlayerItem]];
 [self addAVPlayerNtf:self.player.currentItem];
 if (self.player.rate == 0) {
  [self.player play];
 }
}

- (void) addAVPlayerNtf:(AVPlayerItem *)playerItem {
 //监控状态属性
 [playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:nil];
 //监控网络加载情况属性
 [playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:nil];

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playbackFinished:) name:AVPlayerItemDidPlayToEndTimeNotification object:self.player.currentItem];
}

- (void)removeAvPlayerNtf {
 AVPlayerItem *playerItem = self.player.currentItem;
 [playerItem removeObserver:self forKeyPath:@"status"];
 [playerItem removeObserver:self forKeyPath:@"loadedTimeRanges"];
 [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)stopPlayer {
 if (self.player.rate == 1) {
  [self.player pause];//如果在播放状态就停止
 }
}

/**
 * 通过KVO监控播放器状态
 *
 * @param keyPath 监控属性
 * @param object 监视器
 * @param change 状态改变
 * @param context 上下文
 */
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
 AVPlayerItem *playerItem = object;
 if ([keyPath isEqualToString:@"status"]) {
  AVPlayerStatus status= [[change objectForKey:@"new"] intValue];
  if(status==AVPlayerStatusReadyToPlay){
   NSLog(@"正在播放...，视频总长度:%.2f",CMTimeGetSeconds(playerItem.duration));
  }
 }else if([keyPath isEqualToString:@"loadedTimeRanges"]){
  NSArray *array=playerItem.loadedTimeRanges;
  CMTimeRange timeRange = [array.firstObject CMTimeRangeValue];//本次缓冲时间范围
  float startSeconds = CMTimeGetSeconds(timeRange.start);
  float durationSeconds = CMTimeGetSeconds(timeRange.duration);
  NSTimeInterval totalBuffer = startSeconds + durationSeconds;//缓冲总长度
  NSLog(@"共缓冲：%.2f",totalBuffer);
 }
}

- (void)playbackFinished:(NSNotification *)ntf {
 Plog(@"视频播放完成");
 [self.player seekToTime:CMTimeMake(0, 1)];
 [self.player play];
}

@end

#import "HProgressView.h"

@interface HProgressView ()

/**
 * 进度值0-1.0之间
 */
@property (nonatomic,assign)CGFloat progressValue;

@property (nonatomic, assign) CGFloat currentTime;

@end

@implementation HProgressView


// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
 // Drawing code
 CGContextRef ctx = UIGraphicsGetCurrentContext();//获取上下文
 Plog(@"width = %f",self.frame.size.width);
 CGPoint center = CGPointMake(self.frame.size.width/2.0, self.frame.size.width/2.0); //设置圆心位置
 CGFloat radius = self.frame.size.width/2.0-5; //设置半径
 CGFloat startA = - M_PI_2; //圆起点位置
 CGFloat endA = -M_PI_2 + M_PI * 2 * _progressValue; //圆终点位置

 UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:center radius:radius startAngle:startA endAngle:endA clockwise:YES];

 CGContextSetLineWidth(ctx, 10); //设置线条宽度
 [[UIColor whiteColor] setStroke]; //设置描边颜色

 CGContextAddPath(ctx, path.CGPath); //把路径添加到上下文

 CGContextStrokePath(ctx); //渲染
}

- (void)setTimeMax:(NSInteger)timeMax {
 _timeMax = timeMax;
 self.currentTime = 0;
 self.progressValue = 0;
 [self setNeedsDisplay];
 self.hidden = NO;
 [self performSelector:@selector(startProgress) withObject:nil afterDelay:0.1];
}

- (void)clearProgress {
 _currentTime = _timeMax;
 self.hidden = YES;
}

- (void)startProgress {
 _currentTime += 0.1;
 if (_timeMax > _currentTime) {
  _progressValue = _currentTime/_timeMax;
  Plog(@"progress = %f",_progressValue);
  [self setNeedsDisplay];
  [self performSelector:@selector(startProgress) withObject:nil afterDelay:0.1];
 }

 if (_timeMax <= _currentTime) {
  [self clearProgress];

 }
}

@end

#import "HVideoViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "HAVPlayer.h"
#import "HProgressView.h"
#import <Foundation/Foundation.h>
#import <AssetsLibrary/AssetsLibrary.h>

typedef void(^PropertyChangeBlock)(AVCaptureDevice *captureDevice);
@interface HVideoViewController ()<AVCaptureFileOutputRecordingDelegate>

//轻触拍照，按住摄像
@property (strong, nonatomic) IBOutlet UILabel *labelTipTitle;

//视频输出流
@property (strong,nonatomic) AVCaptureMovieFileOutput *captureMovieFileOutput;
//图片输出流
//@property (strong,nonatomic) AVCaptureStillImageOutput *captureStillImageOutput;//照片输出流
//负责从AVCaptureDevice获得输入数据
@property (strong,nonatomic) AVCaptureDeviceInput *captureDeviceInput;
//后台任务标识
@property (assign,nonatomic) UIBackgroundTaskIdentifier backgroundTaskIdentifier;

@property (assign,nonatomic) UIBackgroundTaskIdentifier lastBackgroundTaskIdentifier;

@property (weak, nonatomic) IBOutlet UIImageView *focusCursor; //聚焦光标

//负责输入和输出设备之间的数据传递
@property(nonatomic)AVCaptureSession *session;

//图像预览层，实时显示捕获的图像
@property(nonatomic)AVCaptureVideoPreviewLayer *previewLayer;

@property (strong, nonatomic) IBOutlet UIButton *btnBack;
//重新录制
@property (strong, nonatomic) IBOutlet UIButton *btnAfresh;
//确定
@property (strong, nonatomic) IBOutlet UIButton *btnEnsure;
//摄像头切换
@property (strong, nonatomic) IBOutlet UIButton *btnCamera;

@property (strong, nonatomic) IBOutlet UIImageView *bgView;
//记录录制的时间 默认最大60秒
@property (assign, nonatomic) NSInteger seconds;

//记录需要保存视频的路径
@property (strong, nonatomic) NSURL *saveVideoUrl;

//是否在对焦
@property (assign, nonatomic) BOOL isFocus;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *afreshCenterX;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *ensureCenterX;
@property (strong, nonatomic) IBOutlet NSLayoutConstraint *backCenterX;

//视频播放
@property (strong, nonatomic) HAVPlayer *player;

@property (strong, nonatomic) IBOutlet HProgressView *progressView;

//是否是摄像 YES 代表是录制 NO 表示拍照
@property (assign, nonatomic) BOOL isVideo;

@property (strong, nonatomic) UIImage *takeImage;
@property (strong, nonatomic) UIImageView *takeImageView;
@property (strong, nonatomic) IBOutlet UIImageView *imgRecord;


@end

//时间大于这个就是视频，否则为拍照
#define TimeMax 1

@implementation HVideoViewController


-(void)dealloc{
 [self removeNotification];


}

- (void)viewDidLoad {
 [super viewDidLoad];
 // Do any additional setup after loading the view.

 UIImage *image = [UIImage imageNamed:@"sc_btn_take.png"];
 self.backCenterX.constant = -(SCREEN_WIDTH/2/2)-image.size.width/2/2;

 self.progressView.layer.cornerRadius = self.progressView.frame.size.width/2;

 if (self.HSeconds == 0) {
  self.HSeconds = 60;
 }

 [self performSelector:@selector(hiddenTipsLabel) withObject:nil afterDelay:4];
}

- (void)hiddenTipsLabel {
 self.labelTipTitle.hidden = YES;
}

- (void)didReceiveMemoryWarning {
 [super didReceiveMemoryWarning];
 // Dispose of any resources that can be recreated.
}

- (void)viewWillAppear:(BOOL)animated {
 [super viewWillAppear:animated];
 [[UIApplication sharedApplication] setStatusBarHidden:YES];
 [self customCamera];
 [self.session startRunning];
}


-(void)viewDidAppear:(BOOL)animated{
 [super viewDidAppear:animated];
}

-(void)viewDidDisappear:(BOOL)animated{
 [super viewDidDisappear:animated];
 [self.session stopRunning];
}

- (void)viewWillDisappear:(BOOL)animated {
 [super viewWillDisappear:animated];
 [[UIApplication sharedApplication] setStatusBarHidden:NO];
}

- (void)customCamera {

 //初始化会话，用来结合输入输出
 self.session = [[AVCaptureSession alloc] init];
 //设置分辨率 (设备支持的最高分辨率)
 if ([self.session canSetSessionPreset:AVCaptureSessionPresetHigh]) {
  self.session.sessionPreset = AVCaptureSessionPresetHigh;
 }
 //取得后置摄像头
 AVCaptureDevice *captureDevice = [self getCameraDeviceWithPosition:AVCaptureDevicePositionBack];
 //添加一个音频输入设备
 AVCaptureDevice *audioCaptureDevice=[[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject];

 //初始化输入设备
 NSError *error = nil;
 self.captureDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:captureDevice error:&error];
 if (error) {
  Plog(@"取得设备输入对象时出错，错误原因：%@",error.localizedDescription);
  return;
 }

 //添加音频
 error = nil;
 AVCaptureDeviceInput *audioCaptureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:audioCaptureDevice error:&error];
 if (error) {
  NSLog(@"取得设备输入对象时出错，错误原因：%@",error.localizedDescription);
  return;
 }

 //输出对象
 self.captureMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];//视频输出

 //将输入设备添加到会话
 if ([self.session canAddInput:self.captureDeviceInput]) {
  [self.session addInput:self.captureDeviceInput];
  [self.session addInput:audioCaptureDeviceInput];
  //设置视频防抖
  AVCaptureConnection *connection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo];
  if ([connection isVideoStabilizationSupported]) {
   connection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeCinematic;
  }
 }

 //将输出设备添加到会话 (刚开始 是照片为输出对象)
 if ([self.session canAddOutput:self.captureMovieFileOutput]) {
  [self.session addOutput:self.captureMovieFileOutput];
 }

 //创建视频预览层，用于实时展示摄像头状态
 self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
 self.previewLayer.frame = self.view.bounds;//CGRectMake(0, 0, self.view.width, self.view.height);
 self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;//填充模式
 [self.bgView.layer addSublayer:self.previewLayer];

 [self addNotificationToCaptureDevice:captureDevice];
 [self addGenstureRecognizer];
}

 

- (IBAction)onCancelAction:(UIButton *)sender {
 [self dismissViewControllerAnimated:YES completion:^{
  [Utility hideProgressDialog];
 }];
}


- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
 if ([[touches anyObject] view] == self.imgRecord) {
  Plog(@"开始录制");
  //根据设备输出获得连接
  AVCaptureConnection *connection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeAudio];
  //根据连接取得设备输出的数据
  if (![self.captureMovieFileOutput isRecording]) {
   //如果支持多任务则开始多任务
   if ([[UIDevice currentDevice] isMultitaskingSupported]) {
    self.backgroundTaskIdentifier = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil];
   }
   if (self.saveVideoUrl) {
    [[NSFileManager defaultManager] removeItemAtURL:self.saveVideoUrl error:nil];
   }
   //预览图层和视频方向保持一致
   connection.videoOrientation = [self.previewLayer connection].videoOrientation;
   NSString *outputFielPath=[NSTemporaryDirectory() stringByAppendingString:@"myMovie.mov"];
   NSLog(@"save path is :%@",outputFielPath);
   NSURL *fileUrl=[NSURL fileURLWithPath:outputFielPath];
   NSLog(@"fileUrl:%@",fileUrl);
   [self.captureMovieFileOutput startRecordingToOutputFileURL:fileUrl recordingDelegate:self];
  } else {
   [self.captureMovieFileOutput stopRecording];
  }
 }
}


- (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
 if ([[touches anyObject] view] == self.imgRecord) {
  Plog(@"结束触摸");
  if (!self.isVideo) {
   [self performSelector:@selector(endRecord) withObject:nil afterDelay:0.3];
  } else {
   [self endRecord];
  }
 }
}

- (void)endRecord {
 [self.captureMovieFileOutput stopRecording];//停止录制
}

- (IBAction)onAfreshAction:(UIButton *)sender {
 Plog(@"重新录制");
 [self recoverLayout];
}

- (IBAction)onEnsureAction:(UIButton *)sender {
 Plog(@"确定 这里进行保存或者发送出去");
 if (self.saveVideoUrl) {
  WS(weakSelf)
  [Utility showProgressDialogText:@"视频处理中..."];
  ALAssetsLibrary *assetsLibrary=[[ALAssetsLibrary alloc]init];
  [assetsLibrary writeVideoAtPathToSavedPhotosAlbum:self.saveVideoUrl completionBlock:^(NSURL *assetURL, NSError *error) {
   Plog(@"outputUrl:%@",weakSelf.saveVideoUrl);
   [[NSFileManager defaultManager] removeItemAtURL:weakSelf.saveVideoUrl error:nil];
   if (weakSelf.lastBackgroundTaskIdentifier!= UIBackgroundTaskInvalid) {
    [[UIApplication sharedApplication] endBackgroundTask:weakSelf.lastBackgroundTaskIdentifier];
   }
   if (error) {
    Plog(@"保存视频到相簿过程中发生错误，错误信息：%@",error.localizedDescription);
    [Utility showAllTextDialog:KAppDelegate.window Text:@"保存视频到相册发生错误"];
   } else {
    if (weakSelf.takeBlock) {
     weakSelf.takeBlock(assetURL);
    }
    Plog(@"成功保存视频到相簿.");
    [weakSelf onCancelAction:nil];
   }
  }];
 } else {
  //照片
  UIImageWriteToSavedPhotosAlbum(self.takeImage, self, nil, nil);
  if (self.takeBlock) {
   self.takeBlock(self.takeImage);
  }

  [self onCancelAction:nil];
 }
}

//前后摄像头的切换
- (IBAction)onCameraAction:(UIButton *)sender {
 Plog(@"切换摄像头");
 AVCaptureDevice *currentDevice=[self.captureDeviceInput device];
 AVCaptureDevicePosition currentPosition=[currentDevice position];
 [self removeNotificationFromCaptureDevice:currentDevice];
 AVCaptureDevice *toChangeDevice;
 AVCaptureDevicePosition toChangePosition = AVCaptureDevicePositionFront;//前
 if (currentPosition == AVCaptureDevicePositionUnspecified || currentPosition == AVCaptureDevicePositionFront) {
  toChangePosition = AVCaptureDevicePositionBack;//后
 }
 toChangeDevice=[self getCameraDeviceWithPosition:toChangePosition];
 [self addNotificationToCaptureDevice:toChangeDevice];
 //获得要调整的设备输入对象
 AVCaptureDeviceInput *toChangeDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:toChangeDevice error:nil];

 //改变会话的配置前一定要先开启配置，配置完成后提交配置改变
 [self.session beginConfiguration];
 //移除原有输入对象
 [self.session removeInput:self.captureDeviceInput];
 //添加新的输入对象
 if ([self.session canAddInput:toChangeDeviceInput]) {
  [self.session addInput:toChangeDeviceInput];
  self.captureDeviceInput = toChangeDeviceInput;
 }
 //提交会话配置
 [self.session commitConfiguration];
}

- (void)onStartTranscribe:(NSURL *)fileURL {
 if ([self.captureMovieFileOutput isRecording]) {
  -- self.seconds;
  if (self.seconds > 0) {
   if (self.HSeconds - self.seconds >= TimeMax && !self.isVideo) {
    self.isVideo = YES;//长按时间超过TimeMax 表示是视频录制
    self.progressView.timeMax = self.seconds;
   }
   [self performSelector:@selector(onStartTranscribe:) withObject:fileURL afterDelay:1.0];
  } else {
   if ([self.captureMovieFileOutput isRecording]) {
    [self.captureMovieFileOutput stopRecording];
   }
  }
 }
}


#pragma mark - 视频输出代理
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections{
 Plog(@"开始录制...");
 self.seconds = self.HSeconds;
 [self performSelector:@selector(onStartTranscribe:) withObject:fileURL afterDelay:1.0];
}


-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{
 Plog(@"视频录制完成.");
 [self changeLayout];
 if (self.isVideo) {
  self.saveVideoUrl = outputFileURL;
  if (!self.player) {
   self.player = [[HAVPlayer alloc] initWithFrame:self.bgView.bounds withShowInView:self.bgView url:outputFileURL];
  } else {
   if (outputFileURL) {
    self.player.videoUrl = outputFileURL;
    self.player.hidden = NO;
   }
  }
 } else {
  //照片
  self.saveVideoUrl = nil;
  [self videoHandlePhoto:outputFileURL];
 }

}

- (void)videoHandlePhoto:(NSURL *)url {
 AVURLAsset *urlSet = [AVURLAsset assetWithURL:url];
 AVAssetImageGenerator *imageGenerator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlSet];
 imageGenerator.appliesPreferredTrackTransform = YES; // 截图的时候调整到正确的方向
 NSError *error = nil;
 CMTime time = CMTimeMake(0,30);//缩略图创建时间 CMTime是表示电影时间信息的结构体，第一个参数表示是视频第几秒，第二个参数表示每秒帧数.(如果要获取某一秒的第几帧可以使用CMTimeMake方法)
 CMTime actucalTime; //缩略图实际生成的时间
 CGImageRef cgImage = [imageGenerator copyCGImageAtTime:time actualTime:&actucalTime error:&error];
 if (error) {
  Plog(@"截取视频图片失败:%@",error.localizedDescription);
 }
 CMTimeShow(actucalTime);
 UIImage *image = [UIImage imageWithCGImage:cgImage];

 CGImageRelease(cgImage);
 if (image) {
  Plog(@"视频截取成功");
 } else {
  Plog(@"视频截取失败");
 }


 self.takeImage = image;//[UIImage imageWithCGImage:cgImage];

 [[NSFileManager defaultManager] removeItemAtURL:url error:nil];

 if (!self.takeImageView) {
  self.takeImageView = [[UIImageView alloc] initWithFrame:self.view.frame];
  [self.bgView addSubview:self.takeImageView];
 }
 self.takeImageView.hidden = NO;
 self.takeImageView.image = self.takeImage;
}

#pragma mark - 通知

//注册通知
- (void)setupObservers
{
 NSNotificationCenter *notification = [NSNotificationCenter defaultCenter];
 [notification addObserver:self selector:@selector(applicationDidEnterBackground:) name:UIApplicationWillResignActiveNotification object:[UIApplication sharedApplication]];
}

//进入后台就退出视频录制
- (void)applicationDidEnterBackground:(NSNotification *)notification {
 [self onCancelAction:nil];
}

/**
 * 给输入设备添加通知
 */
-(void)addNotificationToCaptureDevice:(AVCaptureDevice *)captureDevice{
 //注意添加区域改变捕获通知必须首先设置设备允许捕获
 [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
  captureDevice.subjectAreaChangeMonitoringEnabled=YES;
 }];
 NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
 //捕获区域发生改变
 [notificationCenter addObserver:self selector:@selector(areaChange:) name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice];
}
-(void)removeNotificationFromCaptureDevice:(AVCaptureDevice *)captureDevice{
 NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
 [notificationCenter removeObserver:self name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice];
}
/**
 * 移除所有通知
 */
-(void)removeNotification{
 NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
 [notificationCenter removeObserver:self];
}

-(void)addNotificationToCaptureSession:(AVCaptureSession *)captureSession{
 NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter];
 //会话出错
 [notificationCenter addObserver:self selector:@selector(sessionRuntimeError:) name:AVCaptureSessionRuntimeErrorNotification object:captureSession];
}

/**
 * 设备连接成功
 *
 * @param notification 通知对象
 */
-(void)deviceConnected:(NSNotification *)notification{
 NSLog(@"设备已连接...");
}
/**
 * 设备连接断开
 *
 * @param notification 通知对象
 */
-(void)deviceDisconnected:(NSNotification *)notification{
 NSLog(@"设备已断开.");
}
/**
 * 捕获区域改变
 *
 * @param notification 通知对象
 */
-(void)areaChange:(NSNotification *)notification{
 NSLog(@"捕获区域改变...");
}

/**
 * 会话出错
 *
 * @param notification 通知对象
 */
-(void)sessionRuntimeError:(NSNotification *)notification{
 NSLog(@"会话发生错误.");
}

 

/**
 * 取得指定位置的摄像头
 *
 * @param position 摄像头位置
 *
 * @return 摄像头设备
 */
-(AVCaptureDevice *)getCameraDeviceWithPosition:(AVCaptureDevicePosition )position{
 NSArray *cameras= [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
 for (AVCaptureDevice *camera in cameras) {
  if ([camera position] == position) {
   return camera;
  }
 }
 return nil;
}

/**
 * 改变设备属性的统一操作方法
 *
 * @param propertyChange 属性改变操作
 */
-(void)changeDeviceProperty:(PropertyChangeBlock)propertyChange{
 AVCaptureDevice *captureDevice= [self.captureDeviceInput device];
 NSError *error;
 //注意改变设备属性前一定要首先调用lockForConfiguration:调用完之后使用unlockForConfiguration方法解锁
 if ([captureDevice lockForConfiguration:&error]) {
  //自动白平衡
  if ([captureDevice isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance]) {
   [captureDevice setWhiteBalanceMode:AVCaptureWhiteBalanceModeContinuousAutoWhiteBalance];
  }
  //自动根据环境条件开启闪光灯
  if ([captureDevice isFlashModeSupported:AVCaptureFlashModeAuto]) {
   [captureDevice setFlashMode:AVCaptureFlashModeAuto];
  }

  propertyChange(captureDevice);
  [captureDevice unlockForConfiguration];
 }else{
  NSLog(@"设置设备属性过程发生错误，错误信息：%@",error.localizedDescription);
 }
}

/**
 * 设置闪光灯模式
 *
 * @param flashMode 闪光灯模式
 */
-(void)setFlashMode:(AVCaptureFlashMode )flashMode{
 [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
  if ([captureDevice isFlashModeSupported:flashMode]) {
   [captureDevice setFlashMode:flashMode];
  }
 }];
}
/**
 * 设置聚焦模式
 *
 * @param focusMode 聚焦模式
 */
-(void)setFocusMode:(AVCaptureFocusMode )focusMode{
 [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
  if ([captureDevice isFocusModeSupported:focusMode]) {
   [captureDevice setFocusMode:focusMode];
  }
 }];
}
/**
 * 设置曝光模式
 *
 * @param exposureMode 曝光模式
 */
-(void)setExposureMode:(AVCaptureExposureMode)exposureMode{
 [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
  if ([captureDevice isExposureModeSupported:exposureMode]) {
   [captureDevice setExposureMode:exposureMode];
  }
 }];
}
/**
 * 设置聚焦点
 *
 * @param point 聚焦点
 */
-(void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{
 [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) {
//  if ([captureDevice isFocusPointOfInterestSupported]) {
//   [captureDevice setFocusPointOfInterest:point];
//  }
//  if ([captureDevice isExposurePointOfInterestSupported]) {
//   [captureDevice setExposurePointOfInterest:point];
//  }
  if ([captureDevice isExposureModeSupported:exposureMode]) {
   [captureDevice setExposureMode:exposureMode];
  }
  if ([captureDevice isFocusModeSupported:focusMode]) {
   [captureDevice setFocusMode:focusMode];
  }
 }];
}

/**
 * 添加点按手势，点按时聚焦
 */
-(void)addGenstureRecognizer{
 UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapScreen:)];
 [self.bgView addGestureRecognizer:tapGesture];
}

-(void)tapScreen:(UITapGestureRecognizer *)tapGesture{
 if ([self.session isRunning]) {
  CGPoint point= [tapGesture locationInView:self.bgView];
  //将UI坐标转化为摄像头坐标
  CGPoint cameraPoint= [self.previewLayer captureDevicePointOfInterestForPoint:point];
  [self setFocusCursorWithPoint:point];
  [self focusWithMode:AVCaptureFocusModeContinuousAutoFocus exposureMode:AVCaptureExposureModeContinuousAutoExposure atPoint:cameraPoint];
 }
}

/**
 * 设置聚焦光标位置
 *
 * @param point 光标位置
 */
-(void)setFocusCursorWithPoint:(CGPoint)point{
 if (!self.isFocus) {
  self.isFocus = YES;
  self.focusCursor.center=point;
  self.focusCursor.transform = CGAffineTransformMakeScale(1.25, 1.25);
  self.focusCursor.alpha = 1.0;
  [UIView animateWithDuration:0.5 animations:^{
   self.focusCursor.transform = CGAffineTransformIdentity;
  } completion:^(BOOL finished) {
   [self performSelector:@selector(onHiddenFocusCurSorAction) withObject:nil afterDelay:0.5];
  }];
 }
}

- (void)onHiddenFocusCurSorAction {
 self.focusCursor.alpha=0;
 self.isFocus = NO;
}

//拍摄完成时调用
- (void)changeLayout {
 self.imgRecord.hidden = YES;
 self.btnCamera.hidden = YES;
 self.btnAfresh.hidden = NO;
 self.btnEnsure.hidden = NO;
 self.btnBack.hidden = YES;
 if (self.isVideo) {
  [self.progressView clearProgress];
 }
 self.afreshCenterX.constant = -(SCREEN_WIDTH/2/2);
 self.ensureCenterX.constant = SCREEN_WIDTH/2/2;
 [UIView animateWithDuration:0.25 animations:^{
  [self.view layoutIfNeeded];
 }];

 self.lastBackgroundTaskIdentifier = self.backgroundTaskIdentifier;
 self.backgroundTaskIdentifier = UIBackgroundTaskInvalid;
 [self.session stopRunning];
}


//重新拍摄时调用
- (void)recoverLayout {
 if (self.isVideo) {
  self.isVideo = NO;
  [self.player stopPlayer];
  self.player.hidden = YES;
 }
 [self.session startRunning];

 if (!self.takeImageView.hidden) {
  self.takeImageView.hidden = YES;
 }
// self.saveVideoUrl = nil;
 self.afreshCenterX.constant = 0;
 self.ensureCenterX.constant = 0;
 self.imgRecord.hidden = NO;
 self.btnCamera.hidden = NO;
 self.btnAfresh.hidden = YES;
 self.btnEnsure.hidden = YES;
 self.btnBack.hidden = NO;
 [UIView animateWithDuration:0.25 animations:^{
  [self.view layoutIfNeeded];
 }];
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
 // Get the new view controller using [segue destinationViewController].
 // Pass the selected object to the new view controller.
}
*/

@end

- (IBAction)onCameraAction:(UIButton *)sender {
 //额 。。由于是demo,所以用的xib，大家根据需求自己更改，该demo只是提供一个思路，使用时不要直接拖入项目
 HVideoViewController *ctrl = [[NSBundle mainBundle] loadNibNamed:@"HVideoViewController" owner:nil options:nil].lastObject;
 ctrl.HSeconds = 30;//设置可录制最长时间
 ctrl.takeBlock = ^(id item) {
  if ([item isKindOfClass:[NSURL class]]) {
   NSURL *videoURL = item;
   //视频url

  } else {
   //图片

  }
 };
 [self presentViewController:ctrl animated:YES completion:nil];
}