一般如果UI和UE在设计时只要求功能，对相机界面没什么要求的话，个人觉得调用系统相机（UIImagePickerController）就可以满足我们的需求比如照相或者录制视频,但是考虑界面美观性，有时候就需要我们自定义拍摄界面，此时系统相机已经满足不了我们的需求，跟多的是要跟AVFoundation打交道，
AVCaptureSession：媒体（音、视频）捕获会话，负责把捕获的音视频数据输出到输出设备中，一个AVCaptureSession可以有多个输入输出（前面的是比较专业的说法，然并卵，个人理解这其实相当于一个会话，连接了音频之间的输入和输出，即从你开始拍照或者录制视频到最后出现照片或者视频，整个过程之间的数据流是由它管理的）
AVCaptureDevice：输入设备，包括麦克风、摄像头，通过该对象可以设置物理设备的一些属性（例如相机聚焦、白平衡等）
AVCaptureDeviceInput：设备输入数据管理对象，可以根据AVCaptureDevice创建对应的AVCaptureDeviceInput对象，该对象将会被添加到AVCaptureSession中管理。（即一个输入设备对应一个输入管理对象，然后把它加入会话中）
AVCaptureOutput：输出数据管理对象，用于接收各类输出数据，但是通常我们不直接用它更多的使用它的子类AVCaptureStillImageOutput、AVCaptureMovieFileOutput(相对应的它也是要加入会话的)
拍照：
// // TakephotoVC.m // AVFoundation自定义拍照录像 // // Created by JianF.Sun on 17/3/20. // Copyright © 2017年 sjf. All rights reserved. // #import "TakephotoVC.h" #import <AVFoundation/AVFoundation.h> #import <AssetsLibrary/AssetsLibrary.h> #define Screen_width [UIScreen mainScreen].bounds.size.width #define Screen_height [UIScreen mainScreen].bounds.size.height typedef void(^PropertyChangeBlock)(AVCaptureDevice *captureDevice); @interface TakephotoVC () @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) AVCaptureStillImageOutput *captureStillImageOutput;//照片输出流 @property (strong,nonatomic) AVCaptureVideoPreviewLayer *captureVideoPreviewLayer;//相机拍摄预览图层 @property (weak, nonatomic) IBOutlet UIView *viewContainer; @property (weak, nonatomic) IBOutlet UIButton *takeButton;//拍照按钮 @property (weak, nonatomic) IBOutlet UIButton *flashAutoButton;//自动闪光灯按钮 @property (weak, nonatomic) IBOutlet UIButton *flashOnButton;//打开闪光灯按钮 @property (weak, nonatomic) IBOutlet UIButton *flashOffButton;//关闭闪光灯按钮 @property (weak, nonatomic) IBOutlet UIImageView *focusCursor; //聚焦光标 @end @implementation TakephotoVC - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. // NSLog(@"%f",[UIScreen mainScreen].bounds.size.height); } -(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,后置摄像头 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; } 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; } //初始化设备输出对象，用于获得输出数据 _captureStillImageOutput=[[AVCaptureStillImageOutput alloc]init]; NSDictionary *outputSettings = @{AVVideoCodecKey:AVVideoCodecJPEG}; [_captureStillImageOutput setOutputSettings:outputSettings];//输出设置 //将设备输入添加到会话中 if ([_captureSession canAddInput:_captureDeviceInput]) { [_captureSession addInput:_captureDeviceInput]; } //将设备输出添加到会话中 if ([_captureSession canAddOutput:_captureStillImageOutput]) { [_captureSession addOutput:_captureStillImageOutput]; } //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=CGRectMake(0, 0,Screen_width, Screen_height); _captureVideoPreviewLayer.position=CGPointMake(Screen_width/2, Screen_height/2); _captureVideoPreviewLayer.videoGravity=AVLayerVideoGravityResizeAspect;// //将视频预览层添加到界面中 //[layer addSublayer:_captureVideoPreviewLayer]; [layer insertSublayer:_captureVideoPreviewLayer below:self.focusCursor.layer]; [self addNotificationToCaptureDevice:captureDevice]; [self addGenstureRecognizer]; [self setFlashModeButtonStatus]; } -(void)viewDidAppear:(BOOL)animated{ [super viewDidAppear:animated]; [self.captureSession startRunning]; } -(void)viewDidDisappear:(BOOL)animated{ [super viewDidDisappear:animated]; [self.captureSession stopRunning]; } #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]; } #pragma mark - 私有方法 /** * 会话出错 * * @param notification 通知对象 */ -(void)sessionRuntimeError:(NSNotification *)notification{ NSLog(@"会话发生错误."); } /** * 捕获区域改变 * * @param notification 通知对象 */ -(void)areaChange:(NSNotification *)notification{ NSLog(@"捕获区域改变..."); } /** * 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; } /** * 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]; } }]; } /** * 设置闪光灯按钮状态 */ -(void)setFlashModeButtonStatus{ AVCaptureDevice *captureDevice=[self.captureDeviceInput device]; AVCaptureFlashMode flashMode=captureDevice.flashMode; if([captureDevice isFlashAvailable]){ self.flashAutoButton.hidden=NO; self.flashOnButton.hidden=NO; self.flashOffButton.hidden=NO; self.flashAutoButton.enabled=YES; self.flashOnButton.enabled=YES; self.flashOffButton.enabled=YES; switch (flashMode) { case AVCaptureFlashModeAuto: self.flashAutoButton.enabled=NO; break; case AVCaptureFlashModeOn: self.flashOnButton.enabled=NO; break; case AVCaptureFlashModeOff: self.flashOffButton.enabled=NO; break; default: break; } }else{ self.flashAutoButton.hidden=YES; self.flashOnButton.hidden=YES; self.flashOffButton.hidden=YES; } } /** * 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; }]; } #pragma mark 切换前后摄像头 - (IBAction)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]; [self setFlashModeButtonStatus]; } - (IBAction)closeFlash:(UIButton *)sender { [self setFlashMode:AVCaptureFlashModeOff]; [self setFlashModeButtonStatus]; } - (IBAction)openFlash:(UIButton *)sender { [self setFlashMode:AVCaptureFlashModeOn]; [self setFlashModeButtonStatus]; } - (IBAction)autoFlash:(UIButton *)sender { [self setFlashMode:AVCaptureFlashModeAuto]; [self setFlashModeButtonStatus]; } #pragma mark 拍照 - (IBAction)takeButtonClick:(UIButton *)sender { //根据设备输出获得连接 AVCaptureConnection *captureConnection=[self.captureStillImageOutput connectionWithMediaType:AVMediaTypeVideo]; //根据连接取得设备输出的数据 [self.captureStillImageOutput captureStillImageAsynchronouslyFromConnection:captureConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) { if (imageDataSampleBuffer) { NSData *imageData=[AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer]; UIImage *image=[UIImage imageWithData:imageData]; UIAlertController *alert=[UIAlertController alertControllerWithTitle:@"拍照成功" message:@"是否要保存到照片库" preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *saveAction=[UIAlertAction actionWithTitle:@"保存" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil); [self dismissViewControllerAnimated:YES completion:^{ }]; }]; UIAlertAction *cancelAction=[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) { [self dismissViewControllerAnimated:YES completion:^{ }]; }]; [alert addAction:cancelAction]; [alert addAction:saveAction]; [self presentViewController:alert animated:YES completion:nil]; // ALAssetsLibrary *assetsLibrary=[[ALAssetsLibrary alloc]init]; // [assetsLibrary writeImageToSavedPhotosAlbum:[image CGImage] orientation:(ALAssetOrientation)[image imageOrientation] completionBlock:nil]; } }]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end
录像：
// // RecordVideoVC.m // AVFoundation自定义拍照录像 // // Created by JianF.Sun on 17/3/21. // Copyright © 2017年 sjf. All rights reserved. // #import "RecordVideoVC.h" #import <AVFoundation/AVFoundation.h> #import <AssetsLibrary/AssetsLibrary.h> #define Screen_width [UIScreen mainScreen].bounds.size.width #define Screen_height [UIScreen mainScreen].bounds.size.height typedef void (^PropertyChangeBlock)(AVCaptureDevice *captureDevice); @interface RecordVideoVC () @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 (weak, nonatomic) IBOutlet UIView *viewContainer; @property (weak, nonatomic) IBOutlet UIButton *takeButton;//拍照按钮 @property (weak, nonatomic) IBOutlet UIImageView *focusCursor; //聚焦光标 @end @implementation RecordVideoVC #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=CGRectMake(0, 0,Screen_width, Screen_height); _captureVideoPreviewLayer.position=CGPointMake(Screen_width/2, Screen_height/2); _captureVideoPreviewLayer.videoGravity=AVLayerVideoGravityResizeAspect;// //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]; } -(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 - (IBAction)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.takeButton setTitle:@"正在录制..." forState:UIControlStateNormal]; 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.takeButton setTitle:@"开始录制" forState:UIControlStateNormal]; [self.captureMovieFileOutput stopRecording];//停止录制 } } #pragma mark 切换前后摄像头 - (IBAction)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]; UIAlertController *alert=[UIAlertController alertControllerWithTitle:@"视频录制完成" message:@"是否要保存到照片库" preferredStyle:UIAlertControllerStyleAlert]; UIAlertAction *saveAction=[UIAlertAction actionWithTitle:@"保存" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) { [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."); }]; [self dismissViewControllerAnimated:YES completion:^{ }]; }]; UIAlertAction *cancelAction=[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) { [self dismissViewControllerAnimated:YES completion:^{ }]; }]; [alert addAction:cancelAction]; [alert addAction:saveAction]; [self presentViewController:alert animated:YES completion:nil]; } #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
参考文档：
http://www.jianshu.com/p/b518779c4790，
http://www.cnblogs.com/kenshincui/p/4186022.html#camera，
http://www.jianshu.com/p/8c7ca1dd7f02