怎么在iOS中使用AVCaptureSession实现视频录制功能

#import "RecordingVideoViewController.h" #import <AVFoundation/AVFoundation.h> #import <AssetsLibrary/AssetsLibrary.h> @interface RecordingVideoViewController ()<AVCaptureFileOutputRecordingDelegate> //会话负责输入和输出设备之间的数据传递 @property (strong,nonatomic) AVCaptureSession *captureSession; //设备输入负责从AVCaptureDevice获得输入数据 @property (strong,nonatomic) AVCaptureDeviceInput *videoCaptureDeviceInput; @property (strong,nonatomic) AVCaptureDeviceInput *audioCaptureDeviceInput; //视频输出流 @property (strong,nonatomic) AVCaptureMovieFileOutput *captureMovieFileOutput; //相机拍摄预览图层 @property (strong,nonatomic) AVCaptureVideoPreviewLayer *captureVideoPreviewLayer; //自定义UI控件容器 @property (strong,nonatomic) UIView *viewContainer; //聚焦图标 @property (strong,nonatomic) UIImageView *focusCursor; //录制时长 @property (strong,nonatomic) UILabel *timeLabel; //切换前后摄像头 @property (strong,nonatomic) UIButton *switchCameraBtn; //改变焦距 @property (strong,nonatomic) UIButton *scaleBtn; //计时器 @property (strong,nonatomic) NSTimer *timer; @end @implementation RecordingVideoViewController { @private NSInteger _num; CGFloat _kCameraScale; } - (UIView *)viewContainer { if (!_viewContainer) { _viewContainer = [[UIView alloc] initWithFrame:[UIScreen mainScreen].bounds]; UIButton *takeButton = [UIButton buttonWithType:UIButtonTypeCustom]; takeButton.backgroundColor = [UIColor redColor]; [takeButton setTitle:@"start" forState:UIControlStateNormal]; [takeButton addTarget:self action:@selector(takeButtonClick:) forControlEvents:UIControlEventTouchUpInside]; _timeLabel = [[UILabel alloc] init]; _timeLabel.textColor = [UIColor redColor]; _timeLabel.textAlignment = NSTextAlignmentCenter; _timeLabel.font = [UIFont boldSystemFontOfSize:20]; _timeLabel.text = @"00:00"; _switchCameraBtn = [UIButton buttonWithType:UIButtonTypeCustom]; [_switchCameraBtn setTitle:@"switch" forState:UIControlStateNormal]; _switchCameraBtn.backgroundColor = [UIColor redColor]; [_switchCameraBtn addTarget:self action:@selector(switchCameraBtnClick) forControlEvents:UIControlEventTouchUpInside]; _scaleBtn = [UIButton buttonWithType:UIButtonTypeCustom]; [_scaleBtn setTitle:@"1X" forState:UIControlStateNormal]; _scaleBtn.backgroundColor = [UIColor redColor]; [_scaleBtn addTarget:self action:@selector(scaleBtnClick:) forControlEvents:UIControlEventTouchUpInside]; [_viewContainer addSubview:takeButton]; [_viewContainer addSubview:_timeLabel]; [_viewContainer addSubview:_scaleBtn]; [_viewContainer addSubview:_switchCameraBtn]; [takeButton mas_makeConstraints:^(MASConstraintMaker *make) { make.size.mas_equalTo(CGSizeMake(60, 40)); make.centerX.mas_equalTo(_viewContainer); make.bottom.mas_equalTo(_viewContainer).offset(-64); }]; [_timeLabel mas_makeConstraints:^(MASConstraintMaker *make) { make.centerX.mas_equalTo(_viewContainer); make.height.mas_equalTo(@30); make.top.mas_equalTo(_viewContainer); }]; [_scaleBtn mas_makeConstraints:^(MASConstraintMaker *make) { make.size.mas_equalTo(CGSizeMake(60, 40)); make.left.mas_equalTo(_viewContainer).offset(10); make.top.mas_equalTo(_viewContainer); }]; [_switchCameraBtn mas_makeConstraints:^(MASConstraintMaker *make) { make.size.mas_equalTo(CGSizeMake(60, 40)); make.top.mas_equalTo(_viewContainer); make.right.mas_equalTo(_viewContainer).offset(-10); }]; _focusCursor = [[UIImageView alloc] init]; kBorder(_focusCursor, 1, [UIColor yellowColor]); _focusCursor.alpha = 0; [_viewContainer addSubview:self.focusCursor]; [_focusCursor mas_makeConstraints:^(MASConstraintMaker *make) { make.size.mas_equalTo(CGSizeMake(40, 40)); make.center.mas_equalTo(_viewContainer); }]; } return _viewContainer; } - (void)viewDidLoad { [super viewDidLoad]; self.title = @"视频录制"; _kCameraScale = 1.0f; //初始化会话对象 _captureSession = [[AVCaptureSession alloc] init]; if ([_captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) { _captureSession.sessionPreset = AVCaptureSessionPreset1280x720; } NSError *error = nil; //获取视频输入对象 AVCaptureDevice *videoCaptureDevice = [self cameraDeviceWithPosition:(AVCaptureDevicePositionBack)]; if (!videoCaptureDevice) { NSLog(@"获取后置摄像头失败！"); return; } _videoCaptureDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:videoCaptureDevice error:&error]; if (error) { NSLog(@"取得视频设备输入对象时出错"); return; } //获取音频输入对象 AVCaptureDevice *audioCatureDevice = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject]; _audioCaptureDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:audioCatureDevice error:&error]; if (error) { NSLog(@"取得音频设备输入对象时出错"); return; } //初始化设备输出对象 _captureMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init]; //将设备输入添加到会话中 if ([_captureSession canAddInput:_videoCaptureDeviceInput]) { [_captureSession addInput:_videoCaptureDeviceInput]; [_captureSession addInput:_audioCaptureDeviceInput]; //防抖功能 AVCaptureConnection *captureConnection = [_captureMovieFileOutput connectionWithMediaType:AVMediaTypeAudio]; if ([captureConnection isVideoStabilizationSupported]) { captureConnection.preferredVideoStabilizationMode = AVCaptureVideoStabilizationModeAuto; } } //将设备输出添加到会话中 if ([_captureSession canAddOutput:_captureMovieFileOutput]) { [_captureSession addOutput:_captureMovieFileOutput]; } //创建视频预览图层 _captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession]; self.viewContainer.layer.masksToBounds = YES; _captureVideoPreviewLayer.frame = self.viewContainer.bounds; _captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill; [self.view.layer addSublayer:_captureVideoPreviewLayer]; //显示自定义控件 [self.view addSubview:self.viewContainer]; //添加点按聚焦手势 UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapScreen:)]; [self.viewContainer addGestureRecognizer:tapGesture]; } -(void)viewDidAppear:(BOOL)animated{ [super viewDidAppear:animated]; [self.captureSession startRunning]; } -(void)viewDidDisappear:(BOOL)animated{ [super viewDidDisappear:animated]; [self.captureSession stopRunning]; [self.timer invalidate]; self.timer = nil; } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; [self.captureVideoPreviewLayer setAffineTransform:CGAffineTransformMakeScale(1, 1)]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } //开始 + 暂停录制 - (void)takeButtonClick:(UIButton *)sender { if ([self.captureMovieFileOutput isRecording]) { [self.captureMovieFileOutput stopRecording]; [self.navigationController popViewControllerAnimated:YES]; } else { AVCaptureConnection *captureConnection = [self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo]; captureConnection.videoOrientation = [self.captureVideoPreviewLayer connection].videoOrientation; NSString *filePath = [NSTemporaryDirectory() stringByAppendingPathComponent:@"Movie.mov"]; NSLog(@"%@",filePath); [self.captureMovieFileOutput startRecordingToOutputFileURL:[NSURL fileURLWithPath:filePath] recordingDelegate:self]; self.switchCameraBtn.hidden = YES; sender.backgroundColor = [UIColor greenColor]; [sender setTitle:@"stop" forState:UIControlStateNormal]; self.timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(timeAction) userInfo:nil repeats:YES]; [self.timer setFireDate:[NSDate distantPast]]; } } //切换摄像头 - (void)switchCameraBtnClick { AVCaptureDevicePosition currentPosition = self.videoCaptureDeviceInput.device.position; AVCaptureDevicePosition toPosition; if (currentPosition == AVCaptureDevicePositionUnspecified || currentPosition == AVCaptureDevicePositionFront) { toPosition = AVCaptureDevicePositionBack; } else { toPosition = AVCaptureDevicePositionFront; } AVCaptureDevice *toCapturDevice = [self cameraDeviceWithPosition:toPosition]; if (!toCapturDevice) { NSLog(@"获取要切换的设备失败"); return; } NSError *error = nil; AVCaptureDeviceInput *toVideoDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:toCapturDevice error:&error]; if (error) { NSLog(@"获取要切换的设备输入失败"); return; } //改变会话配置 [self.captureSession beginConfiguration]; [self.captureSession removeInput:self.videoCaptureDeviceInput]; if ([self.captureSession canAddInput:toVideoDeviceInput]) { [self.captureSession addInput:toVideoDeviceInput]; self.videoCaptureDeviceInput = toVideoDeviceInput; } //提交会话配置 [self.captureSession commitConfiguration]; } //点按手势 - (void)tapScreen:(UITapGestureRecognizer *)tap { CGPoint point = [tap locationInView:self.viewContainer]; //将界面point对应到摄像头point CGPoint cameraPoint = [self.captureVideoPreviewLayer captureDevicePointOfInterestForPoint:point]; //设置聚光动画 self.focusCursor.center = point; self.focusCursor.transform = CGAffineTransformMakeScale(1.5, 1.5); self.focusCursor.alpha = 1.0f; [UIView animateWithDuration:1 animations:^{ self.focusCursor.transform = CGAffineTransformIdentity; } completion:^(BOOL finished) { self.focusCursor.alpha = 0.0f; }]; //设置聚光点坐标 [self focusWithMode:AVCaptureFocusModeAutoFocus exposureMode:AVCaptureExposureModeAutoExpose atPoint:cameraPoint]; } /**设置聚焦点*/ -(void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{ AVCaptureDevice *captureDevice= [self.videoCaptureDeviceInput device]; NSError *error = nil; //设置设备属性必须先解锁然后加锁 if ([captureDevice lockForConfiguration:&error]) { if ([captureDevice isFocusModeSupported:focusMode]) { [captureDevice setFocusMode:focusMode]; } if ([captureDevice isFocusPointOfInterestSupported]) { [captureDevice setFocusPointOfInterest:point]; } // //曝光 // if ([captureDevice isExposureModeSupported:exposureMode]) { // [captureDevice setExposureMode:exposureMode]; // } // if ([captureDevice isExposurePointOfInterestSupported]) { // [captureDevice setExposurePointOfInterest:point]; // } // //闪光灯模式 // if ([captureDevice isFlashModeSupported:AVCaptureFlashModeAuto]) { // [captureDevice setFlashMode:AVCaptureFlashModeAuto]; // } //加锁 [captureDevice unlockForConfiguration]; }else{ NSLog(@"设置设备属性过程发生错误，错误信息：%@",error.localizedDescription); } } //调整焦距 -(void)scaleBtnClick:(UIButton *)sender { _kCameraScale += 0.5; if(_kCameraScale > 3.0) { _kCameraScale = 1.0; } //改变焦距 AVCaptureDevice *videoDevice = self.videoCaptureDeviceInput.device; NSError *error = nil; if ([videoDevice lockForConfiguration:&error]) { [videoDevice setVideoZoomFactor:_kCameraScale]; [videoDevice unlockForConfiguration]; [sender setTitle:[NSString stringWithFormat:@"%lgX",_kCameraScale] forState:UIControlStateNormal]; [CATransaction begin]; [CATransaction setAnimationDuration:0.25]; [self.captureVideoPreviewLayer setAffineTransform:CGAffineTransformMakeScale(_kCameraScale, _kCameraScale)]; [CATransaction commit]; } else { NSLog(@"修改设备属性失败!") } } #pragma mark -------- AVCaptureFileOutputRecordingDelegate ---------- - (void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections { NSLog(@"开始录制"); } - (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error { NSLog(@"录制结束"); ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init]; [assetsLibrary writeVideoAtPathToSavedPhotosAlbum:outputFileURL completionBlock:^(NSURL *assetURL, NSError *error) { if (error) { NSLog(@"保存视频到相簿过程中发生错误，错误信息：%@",error.localizedDescription); } }]; } //录制计时 - (void)timeAction { self.timeLabel.text = [NSString stringWithFormat:@"%.2ld:%.2ld",_num/60,_num%60]; _num ++; } /**取得指定位置的摄像头*/ - (AVCaptureDevice *)cameraDeviceWithPosition:(AVCaptureDevicePosition )position{ NSArray *cameras = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; for (AVCaptureDevice *camera in cameras) { if ([camera position] == position) { return camera; } } return nil; } @end

#import "VideoTestViewController.h" #import <AVFoundation/AVFoundation.h> #import <AssetsLibrary/AssetsLibrary.h> typedef void(^PropertyChangeBlock)(AVCaptureDevice *captureDevice); @interface VideoTestViewController ()<AVCaptureFileOutputRecordingDelegate>//视频文件输出代理 @property (strong,nonatomic) AVCaptureSession *captureSession;//负责输入和输出设备之间的数据传递 @property (strong,nonatomic) AVCaptureDeviceInput *captureDeviceInput;//负责从AVCaptureDevice获得输入数据 @property (strong,nonatomic) AVCaptureMovieFileOutput *captureMovieFileOutput;//视频输出流 @property (strong,nonatomic) AVCaptureVideoPreviewLayer *captureVideoPreviewLayer;//相机拍摄预览图层 @property (assign,nonatomic) BOOL enableRotation;//是否允许旋转（注意在视频录制过程中禁止屏幕旋转） @property (assign,nonatomic) CGRect *lastBounds;//旋转的前大小 @property (assign,nonatomic) UIBackgroundTaskIdentifier backgroundTaskIdentifier;//后台任务标识 @property (strong,nonatomic) UIView *viewContainer; @property (strong,nonatomic) UIButton *takeButton;//拍照按钮 @property (strong,nonatomic) UIImageView *focusCursor; //聚焦光标 @end @implementation VideoTestViewController #pragma mark - 控制器视图方法 - (void)viewDidLoad { [super viewDidLoad]; } -(void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; //初始化会话 _captureSession=[[AVCaptureSession alloc]init]; if ([_captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) {//设置分辨率 _captureSession.sessionPreset=AVCaptureSessionPreset1280x720; } //获得输入设备 AVCaptureDevice *captureDevice=[self getCameraDeviceWithPosition:AVCaptureDevicePositionBack];//取得后置摄像头 if (!captureDevice) { NSLog(@"取得后置摄像头时出现问题."); return; } //添加一个音频输入设备 AVCaptureDevice *audioCaptureDevice=[[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject]; NSError *error=nil; //根据输入设备初始化设备输入对象，用于获得输入数据 _captureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:captureDevice error:&error]; if (error) { NSLog(@"取得设备输入对象时出错，错误原因：%@",error.localizedDescription); return; } 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; } //初始化设备输出对象，用于获得输出数据 _captureMovieFileOutput=[[AVCaptureMovieFileOutput alloc]init]; //将设备输入添加到会话中 if ([_captureSession canAddInput:_captureDeviceInput]) { [_captureSession addInput:_captureDeviceInput]; [_captureSession addInput:audioCaptureDeviceInput]; AVCaptureConnection *captureConnection=[_captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo]; if ([captureConnection isVideoStabilizationSupported ]) { captureConnection.preferredVideoStabilizationMode=AVCaptureVideoStabilizationModeAuto; } } //将设备输出添加到会话中 if ([_captureSession canAddOutput:_captureMovieFileOutput]) { [_captureSession addOutput:_captureMovieFileOutput]; } //创建视频预览层，用于实时展示摄像头状态 _captureVideoPreviewLayer=[[AVCaptureVideoPreviewLayer alloc]initWithSession:self.captureSession]; CALayer *layer=self.viewContainer.layer; layer.masksToBounds=YES; _captureVideoPreviewLayer.frame=layer.bounds; _captureVideoPreviewLayer.videoGravity=AVLayerVideoGravityResizeAspectFill;//填充模式 //将视频预览层添加到界面中 //[layer addSublayer:_captureVideoPreviewLayer]; [layer insertSublayer:_captureVideoPreviewLayer below:self.focusCursor.layer]; _enableRotation=YES; [self addNotificationToCaptureDevice:captureDevice]; [self addGenstureRecognizer]; } -(void)viewDidAppear:(BOOL)animated{ [super viewDidAppear:animated]; [self.captureSession startRunning]; } -(void)viewDidDisappear:(BOOL)animated{ [super viewDidDisappear:animated]; [self.captureSession stopRunning]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; } -(BOOL)shouldAutorotate{ return self.enableRotation; } ////屏幕旋转时调整视频预览图层的方向 //-(void)willTransitionToTraitCollection:(UITraitCollection *)newCollection withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator{ // [super willTransitionToTraitCollection:newCollection withTransitionCoordinator:coordinator]; //// NSLog(@"%i,%i",newCollection.verticalSizeClass,newCollection.horizontalSizeClass); // UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation]; // NSLog(@"%i",orientation); // AVCaptureConnection *captureConnection=[self.captureVideoPreviewLayer connection]; // captureConnection.videoOrientation=orientation; // //} //屏幕旋转时调整视频预览图层的方向 -(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{ AVCaptureConnection *captureConnection=[self.captureVideoPreviewLayer connection]; captureConnection.videoOrientation=(AVCaptureVideoOrientation)toInterfaceOrientation; } //旋转后重新设置大小 -(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{ _captureVideoPreviewLayer.frame=self.viewContainer.bounds; } -(void)dealloc{ [self removeNotification]; } #pragma mark - UI方法 #pragma mark 视频录制 - (void)takeButtonClick:(UIButton *)sender { //根据设备输出获得连接 AVCaptureConnection *captureConnection=[self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo]; //根据连接取得设备输出的数据 if (![self.captureMovieFileOutput isRecording]) { self.enableRotation=NO; //如果支持多任务则则开始多任务 if ([[UIDevice currentDevice] isMultitaskingSupported]) { self.backgroundTaskIdentifier=[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil]; } //预览图层和视频方向保持一致 captureConnection.videoOrientation=[self.captureVideoPreviewLayer connection].videoOrientation; NSString *outputFielPath=[NSTemporaryDirectory() stringByAppendingString:@"myMovie.mov"]; NSLog(@"save path is :%@",outputFielPath); NSURL *fileUrl=[NSURL fileURLWithPath:outputFielPath]; [self.captureMovieFileOutput startRecordingToOutputFileURL:fileUrl recordingDelegate:self]; } else{ [self.captureMovieFileOutput stopRecording];//停止录制 } } #pragma mark 切换前后摄像头 - (void)toggleButtonClick:(UIButton *)sender { AVCaptureDevice *currentDevice=[self.captureDeviceInput device]; AVCaptureDevicePosition currentPosition=[currentDevice position]; [self removeNotificationFromCaptureDevice:currentDevice]; AVCaptureDevice *toChangeDevice; AVCaptureDevicePosition toChangePosition=AVCaptureDevicePositionFront; if (currentPosition==AVCaptureDevicePositionUnspecified||currentPosition==AVCaptureDevicePositionFront) { toChangePosition=AVCaptureDevicePositionBack; } 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.captureSession beginConfiguration]; //移除原有输入对象 [self.captureSession removeInput:self.captureDeviceInput]; //添加新的输入对象 if ([self.captureSession canAddInput:toChangeDeviceInput]) { [self.captureSession addInput:toChangeDeviceInput]; self.captureDeviceInput=toChangeDeviceInput; } //提交会话配置 [self.captureSession commitConfiguration]; } #pragma mark - 视频输出代理 -(void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections{ NSLog(@"开始录制..."); } -(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{ NSLog(@"视频录制完成."); //视频录入完成之后在后台将视频存储到相簿 self.enableRotation=YES; UIBackgroundTaskIdentifier lastBackgroundTaskIdentifier=self.backgroundTaskIdentifier; self.backgroundTaskIdentifier=UIBackgroundTaskInvalid; ALAssetsLibrary *assetsLibrary=[[ALAssetsLibrary alloc]init]; [assetsLibrary writeVideoAtPathToSavedPhotosAlbum:outputFileURL completionBlock:^(NSURL *assetURL, NSError *error) { if (error) { NSLog(@"保存视频到相簿过程中发生错误，错误信息：%@",error.localizedDescription); } if (lastBackgroundTaskIdentifier!=UIBackgroundTaskInvalid) { [[UIApplication sharedApplication] endBackgroundTask:lastBackgroundTaskIdentifier]; } NSLog(@"成功保存视频到相簿."); }]; } #pragma mark - 通知 /** * 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."); } #pragma mark - 私有方法 /** * 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]) { 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 isFocusModeSupported:focusMode]) { [captureDevice setFocusMode:AVCaptureFocusModeAutoFocus]; } if ([captureDevice isFocusPointOfInterestSupported]) { [captureDevice setFocusPointOfInterest:point]; } if ([captureDevice isExposureModeSupported:exposureMode]) { [captureDevice setExposureMode:AVCaptureExposureModeAutoExpose]; } if ([captureDevice isExposurePointOfInterestSupported]) { [captureDevice setExposurePointOfInterest:point]; } }]; } /** * 添加点按手势，点按时聚焦 */ -(void)addGenstureRecognizer{ UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapScreen:)]; [self.viewContainer addGestureRecognizer:tapGesture]; } -(void)tapScreen:(UITapGestureRecognizer *)tapGesture{ CGPoint point= [tapGesture locationInView:self.viewContainer]; //将UI坐标转化为摄像头坐标 CGPoint cameraPoint= [self.captureVideoPreviewLayer captureDevicePointOfInterestForPoint:point]; [self setFocusCursorWithPoint:point]; [self focusWithMode:AVCaptureFocusModeAutoFocus exposureMode:AVCaptureExposureModeAutoExpose atPoint:cameraPoint]; } /** * 设置聚焦光标位置 * * @param point 光标位置 */ -(void)setFocusCursorWithPoint:(CGPoint)point{ self.focusCursor.center=point; self.focusCursor.transform=CGAffineTransformMakeScale(1.5, 1.5); self.focusCursor.alpha=1.0; [UIView animateWithDuration:1.0 animations:^{ self.focusCursor.transform=CGAffineTransformIdentity; } completion:^(BOOL finished) { self.focusCursor.alpha=0; }]; } @end

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