#import "MovieViewController.h"
#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>
typedef void(^PropertyChangeBlock)(AVCaptureDevice *captureDevice);

@interface MovieViewController ``()<AVCaptureFileOutputRecordingDelegate>

@property (strong,nonatomic) AVCaptureSession *captureSession;//負(fù)責(zé)輸入和輸出設(shè)備之間的數(shù)據(jù)傳遞
@property (strong,nonatomic) AVCaptureDeviceInput *captureDeviceInput;//負(fù)責(zé)從AVCaptureDevice獲得輸入數(shù)據(jù)
@property (strong,nonatomic) AVCaptureMovieFileOutput *captureMovieFileOutput;//視頻輸出流
@property (strong,nonatomic) AVCaptureVideoPreviewLayer *captureVideoPreviewLayer;//相機(jī)拍攝預(yù)覽圖層
@property (assign,nonatomic) BOOL enableRotation;//是否允許旋轉(zhuǎn)（注意在視頻錄制過(guò)程中禁止屏幕旋轉(zhuǎn)）
@property (assign,nonatomic) CGRect *lastBounds;//旋轉(zhuǎn)的前大小
@property (assign,nonatomic) UIBackgroundTaskIdentifier backgroundTaskIdentifier;//后臺(tái)任務(wù)標(biāo)識(shí)
@property (weak, nonatomic) IBOutlet UIView *viewContainer;
@property (weak, nonatomic) IBOutlet UIButton *takeButton;//拍照按鈕
@property (weak, nonatomic) IBOutlet UIImageView *focusCursor; //聚焦光標(biāo)

@end

@implementation MovieViewController

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

-(void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; //初始化會(huì)話 _captureSession=[[AVCaptureSession alloc]init]; if ([_captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) {//設(shè)置分辨率 _captureSession.sessionPreset=AVCaptureSessionPreset1280x720; }
//獲得輸入設(shè)備
AVCaptureDevice *captureDevice=[self getCameraDeviceWithPosition:AVCaptureDevicePositionBack];//取得后置攝像頭 if (!captureDevice) { NSLog(@"取得后置攝像頭時(shí)出現(xiàn)問(wèn)題."); return; }
//添加一個(gè)音頻輸入設(shè)備
AVCaptureDevice *audioCaptureDevice=[[AVCaptureDevice devicesWithMediaType:AVMediaTypeAudio] firstObject];

NSError *error=nil;
//根據(jù)輸入設(shè)備初始化設(shè)備輸入對(duì)象起趾，用于獲得輸入數(shù)據(jù)
_captureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:captureDevice error:&error];
if (error) {
    NSLog(@"取得設(shè)備輸入對(duì)象時(shí)出錯(cuò)，錯(cuò)誤原因：%@",error.localizedDescription);
    return;
}
AVCaptureDeviceInput *audioCaptureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:audioCaptureDevice error:&error];
if (error) {
    NSLog(@"取得設(shè)備輸入對(duì)象時(shí)出錯(cuò)，錯(cuò)誤原因：%@",error.localizedDescription);
    return;
}
//初始化設(shè)備輸出對(duì)象，用于獲得輸出數(shù)據(jù)
_captureMovieFileOutput=[[AVCaptureMovieFileOutput alloc]init];

//將設(shè)備輸入添加到會(huì)話中
if ([_captureSession canAddInput:_captureDeviceInput]) {
    [_captureSession addInput:_captureDeviceInput];
    [_captureSession addInput:audioCaptureDeviceInput];
    AVCaptureConnection *captureConnection=[_captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo];
    if ([captureConnection isVideoStabilizationSupported ]) {
        captureConnection.preferredVideoStabilizationMode=AVCaptureVideoStabilizationModeAuto;
    }
}

//將設(shè)備輸出添加到會(huì)話中
if ([_captureSession canAddOutput:_captureMovieFileOutput]) {
    [_captureSession addOutput:_captureMovieFileOutput];
}

//創(chuàng)建視頻預(yù)覽層，用于實(shí)時(shí)展示攝像頭狀態(tài)
_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
//將視頻預(yù)覽層添加到界面中
//[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; }

////屏幕旋轉(zhuǎn)時(shí)調(diào)整視頻預(yù)覽圖層的方向
//-(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;
//
//}
//屏幕旋轉(zhuǎn)時(shí)調(diào)整視頻預(yù)覽圖層的方向
-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{
AVCaptureConnection *captureConnection=[self.captureVideoPreviewLayer connection];
captureConnection.videoOrientation=(AVCaptureVideoOrientation)toInterfaceOrientation;
}
//旋轉(zhuǎn)后重新設(shè)置大小
-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation{ _captureVideoPreviewLayer.frame=self.viewContainer.bounds; }

-(void)dealloc{ [self removeNotification]; }
#pragma mark - UI方法
#pragma mark 視頻錄制
- (IBAction)takeButtonClick:(UIButton *)sender { //根據(jù)設(shè)備輸出獲得連接 AVCaptureConnection *captureConnection=[self.captureMovieFileOutput connectionWithMediaType:AVMediaTypeVideo]; //根據(jù)連接取得設(shè)備輸出的數(shù)據(jù) if (![self.captureMovieFileOutput isRecording]) { self.enableRotation=NO; //如果支持多任務(wù)則則開始多任務(wù) if ([[UIDevice currentDevice] isMultitaskingSupported]) { self.backgroundTaskIdentifier=[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil]; } //預(yù)覽圖層和視頻方向保持一致 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];//停止錄制 } }
#pragma mark 切換前后攝像頭
- (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]; //獲得要調(diào)整的設(shè)備輸入對(duì)象 AVCaptureDeviceInput *toChangeDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:toChangeDevice error:nil];

//改變會(huì)話的配置前一定要先開啟配置匿情，配置完成后提交配置改變 [self.captureSession beginConfiguration]; //移除原有輸入對(duì)象 [self.captureSession removeInput:self.captureDeviceInput]; //添加新的輸入對(duì)象 if ([self.captureSession canAddInput:toChangeDeviceInput]) { [self.captureSession addInput:toChangeDeviceInput]; self.captureDeviceInput=toChangeDeviceInput; }
//提交會(huì)話配置 [self.captureSession commitConfiguration];

}

#pragma mark - 視頻輸出代理
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections{ NSLog(@"開始錄制..."); }
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{ NSLog(@"視頻錄制完成."); //視頻錄入完成之后在后臺(tái)將視頻存儲(chǔ)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(@"保存視頻到相簿過(guò)程中發(fā)生錯(cuò)誤，錯(cuò)誤信息：%@",error.localizedDescription); } if (lastBackgroundTaskIdentifier!=UIBackgroundTaskInvalid) { [[UIApplication sharedApplication] endBackgroundTask:lastBackgroundTaskIdentifier]; } NSLog(@"成功保存視頻到相簿."); }];

}

#pragma mark - 通知
/**
* 給輸入設(shè)備添加通知 */
-(void)addNotificationToCaptureDevice:(AVCaptureDevice *)captureDevice{ //注意添加區(qū)域改變捕獲通知必須首先設(shè)置設(shè)備允許捕獲 [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) { captureDevice.subjectAreaChangeMonitoringEnabled=YES; }];
NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter]; //捕獲區(qū)域發(fā)生改變 [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];
//會(huì)話出錯(cuò) [notificationCenter addObserver:self selector:@selector(sessionRuntimeError:) name:AVCaptureSessionRuntimeErrorNotification object:captureSession]; }

/**
* 設(shè)備連接成功
*
* @param notification 通知對(duì)象
*/
-(void)deviceConnected:(NSNotification *)notification{ NSLog(@"設(shè)備已連接..."); }
/**

• 設(shè)備連接斷開
• @param notification 通知對(duì)象
  /
  -(void)deviceDisconnected:(NSNotification )notification{
  NSLog(@"設(shè)備已斷開.");
  }
  /
• 捕獲區(qū)域改變
• @param notification 通知對(duì)象
  */
  -(void)areaChange:(NSNotification *)notification{
  NSLog(@"捕獲區(qū)域改變...");
  }

/**

• 會(huì)話出錯(cuò)
• @param notification 通知對(duì)象
  */
  -(void)sessionRuntimeError:(NSNotification *)notification{
  NSLog(@"會(huì)話發(fā)生錯(cuò)誤.");
  }

pragma mark - 私有方法

/**

• 取得指定位置的攝像頭
• @param position 攝像頭位置
• @return 攝像頭設(shè)備
  */
  -(AVCaptureDevice *)getCameraDeviceWithPosition:(AVCaptureDevicePosition )position{
  NSArray *cameras= [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
  for (AVCaptureDevice *camera in cameras) {
  if ([camera position]==position) {
  return camera;
  }
  }
  return nil;
  }

/**

• 改變?cè)O(shè)備屬性的統(tǒng)一操作方法
• @param propertyChange 屬性改變操作
  */
  -(void)changeDeviceProperty:(PropertyChangeBlock)propertyChange{
  AVCaptureDevice *captureDevice= [self.captureDeviceInput device];
  NSError *error;
  //注意改變?cè)O(shè)備屬性前一定要首先調(diào)用lockForConfiguration:調(diào)用完之后使用unlockForConfiguration方法解鎖
  if ([captureDevice lockForConfiguration:&error]) {
  propertyChange(captureDevice);
  [captureDevice unlockForConfiguration];
  }else{
  NSLog(@"設(shè)置設(shè)備屬性過(guò)程發(fā)生錯(cuò)誤，錯(cuò)誤信息：%@",error.localizedDescription);
  }
  }

/**

• 設(shè)置閃光燈模式
• @param flashMode 閃光燈模式
  /
  -(void)setFlashMode:(AVCaptureFlashMode )flashMode{
  [self changeDeviceProperty:^(AVCaptureDevice captureDevice) {
  if ([captureDevice isFlashModeSupported:flashMode]) {
  [captureDevice setFlashMode:flashMode];
  }
  }];
  }
  /
• 設(shè)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];
  }
  }];
  }
  /
• 設(shè)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];
  }
  }];
  }
  /
• 設(shè)置聚焦點(diǎn)
• @param point 聚焦點(diǎn)
  */
  -(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];
  }
  }];
  }

/**

• 添加點(diǎn)按手勢(shì)渔呵，點(diǎn)按時(shí)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];
  //將UI坐標(biāo)轉(zhuǎn)化為攝像頭坐標(biāo)
  CGPoint cameraPoint= [self.captureVideoPreviewLayer captureDevicePointOfInterestForPoint:point];
  [self setFocusCursorWithPoint:point];
  [self focusWithMode:AVCaptureFocusModeAutoFocus exposureMode:AVCaptureExposureModeAutoExpose atPoint:cameraPoint];
  }

/**

• 設(shè)置聚焦光標(biāo)位置

• @param point 光標(biāo)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
`