iOS框架AVFoundation实现相机拍照、录制视频

#import "CustomeCameraViewController.h" #import <AVFoundation/AVFoundation.h> #import <AssetsLibrary/AssetsLibrary.h>  @interface CustomeCameraViewController ()<AVCaptureFileOutputRecordingDelegate>  {  // AVCaptureSession对象来执行输入设备和输出设备之间的数据传递  AVCaptureSession *iSession;  //当前设备  AVCaptureDevice *iDevice;  //输入设备  AVCaptureDeviceInput *iDeviceInput;  //照片输出流  AVCaptureStillImageOutput *iStillImageOutput;  //预览图层  AVCaptureVideoPreviewLayer *iPreviewLayer;   } 

-(void)viewDidLoad {  [super viewDidLoad];    //点击屏幕对焦  UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(focusTap:)];  [self.view addGestureRecognizer:tap];      iSession = [[AVCaptureSession alloc]init];    NSArray *deviceArray = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];  for (AVCaptureDevice *device in deviceArray) {      //AVCaptureDevicePositionBack 后置摄像头   //AVCaptureDevicePositionFront 前置摄像头   if (device.position == AVCaptureDevicePositionBack) {    iDevice = device;   }  }      iSession.sessionPreset = [self getSessionPresetForDevice:iDevice];    iDeviceInput = [[AVCaptureDeviceInput alloc]initWithDevice:iDevice error:nil];      ////输出设置。AVVideoCodecJPEG 输出jpeg格式图片  iStillImageOutput = [[AVCaptureStillImageOutput alloc]init];  NSDictionary *outputDic = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey, nil nil];  [iStillImageOutput setOutputSettings:outputDic];      //更改这个设备设置的时候必须先锁定设备，修改完后再解锁，否则崩溃  [iDevice lockForConfiguration:nil];  if ([iDevice isFlashModeSupported:AVCaptureFlashModeOff]) {   [iDevice setFlashMode:AVCaptureFlashModeOff];  }  if ([iDevice isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {   [iDevice setFocusMode:AVCaptureFocusModeAutoFocus];  }  if ([iDevice isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeAutoWhiteBalance]) {   [iDevice setWhiteBalanceMode:AVCaptureWhiteBalanceModeAutoWhiteBalance];  }  [iDevice unlockForConfiguration];    if ([iSession canAddInput:iDeviceInput]) {   [iSession addInput:iDeviceInput];  }  if ([iSession canAddOutput:iStillImageOutput]) {   [iSession addOutput:iStillImageOutput];  }  if ([iSession canAddOutput:iVideoOutput]) {   [iSession addOutput:iVideoOutput];  }    //初始化预览图层  iPreviewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:iSession];  [iPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];  iPreviewLayer.frame = CGRectMake(0, 60, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height-160);  [self.iCameraView.layer addSublayer:iPreviewLayer];    [iSession startRunning];    }

//拍照 -(void)takePictures{  AVCaptureConnection *connection = [iStillImageOutput connectionWithMediaType:AVMediaTypeVideo];  if (!connection) {   NSLog(@"失败");   return;  }  //设置焦距  [connection setVideoScaleAndCropFactor:1];    [iStillImageOutput captureStillImageAsynchronouslyFromConnection:connection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {   if (imageDataSampleBuffer==NULL) {    NSLog(@"NUll");    return ;   }      NSData *data = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];   UIImage *image = [UIImage imageWithData:data];        }]; }

-(NSString *)getSessionPresetForDevice:(AVCaptureDevice *)device{  if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset3840x2160]) {   return AVCaptureSessionPreset3840x2160;  } else if([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset1920x1080]){   return AVCaptureSessionPreset1920x1080;  } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset1280x720]){   return AVCaptureSessionPreset1280x720;  } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset640x480]){   return AVCaptureSessionPreset640x480;  } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset352x288]){   return AVCaptureSessionPreset352x288;  } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPresetHigh]){   return AVCaptureSessionPresetHigh;  } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPresetMedium]){   return AVCaptureSessionPresetMedium;  } else{   return AVCaptureSessionPresetLow;  } }

- (IBAction)iFlashBtn:(id)sender {    [iDevice lockForConfiguration:nil];  if (iDevice.flashMode == AVCaptureFlashModeOff) {   if ([iDevice isFlashModeSupported:AVCaptureFlashModeOn]) {    [iDevice setFlashMode:AVCaptureFlashModeOn];        [self.iFlashBtn setBackgroundImage:[UIImage imageNamed:@"flashBtn"] forState:UIControlStateNormal];   }  } else if (iDevice.flashMode == AVCaptureFlashModeOn){   if ([iDevice isFlashModeSupported:AVCaptureFlashModeOff]) {    [iDevice setFlashMode:AVCaptureFlashModeOff];         [self.iFlashBtn setBackgroundImage:[UIImage imageNamed:@"flashOffBtn"] forState:UIControlStateNormal];   }  }  [iDevice unlockForConfiguration];   }

- (IBAction)iChangeBtn:(id)sender {      NSArray *array = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];  AVCaptureDevice *newDevice = nil;  AVCaptureDeviceInput *newDeviceInput = nil;    CATransition *animation = [CATransition animation];  animation.duration = 0.5f;  animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];  animation.type = @"oglFlip";    if (iDevice.position == AVCaptureDevicePositionBack) {   animation.subtype = kCATransitionFromLeft;   for (AVCaptureDevice *device in array) {    if (device.position == AVCaptureDevicePositionFront) {     newDevice = device;    }   }  } else if (iDevice.position == AVCaptureDevicePositionFront){   animation.subtype = kCATransitionFromRight;   for (AVCaptureDevice *device in array) {    if (device.position == AVCaptureDevicePositionBack) {     newDevice = device;    }   }  }    newDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:newDevice error:nil];  [iPreviewLayer addAnimation:animation forKey:nil];  if (newDeviceInput!=nil) {   [iSession beginConfiguration];   [iSession removeInput:iDeviceInput];    iSession.sessionPreset = [self getSessionPresetForDevice:newDevice];   if ([iSession canAddInput:newDeviceInput]) {    [iSession addInput:newDeviceInput];    iDeviceInput = newDeviceInput;    iDevice = newDevice;   } else {    [iSession addInput:iDeviceInput];   }   [iSession commitConfiguration];  }     }

//点击屏幕对焦 -(void)focusTap:(UIGestureRecognizer *)tap{  CGPoint tapPoint = [tap locationInView:self.view];      float Y = tapPoint.y;  if (Y<60 || Y>([UIScreen mainScreen].bounds.size.height-100)) {   return;  }    [iDevice lockForConfiguration:nil];  if ([iDevice isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {   [iDevice setFocusPointOfInterest:CGPointMake(tapPoint.x/self.view.frame.origin.x, tapPoint.y/self.view.frame.origin.y)];   [iDevice setFocusMode:AVCaptureFocusModeAutoFocus];  }  [iDevice unlockForConfiguration];    self.iFocusImgView.center = tapPoint;  self.iFocusImgView.hidden = NO;  [UIView animateWithDuration:0.3 animations:^{   self.iFocusImgView.transform = CGAffineTransformMakeScale(1.25, 1.25);  }completion:^(BOOL finished) {   [UIView animateWithDuration:0.5 animations:^{    self.iFocusImgView.transform = CGAffineTransformIdentity;   } completion:^(BOOL finished) {    self.iFocusImgView.hidden = YES;   }];  }]; }