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如何用AVFoundation框架實現相機拍照和錄制視頻

發(fā)布時間：2020-06-25 17:11:17 來源：億速云 閱讀：223 作者：Leah 欄目：移動開發(fā)

本篇文章為大家展示了如何用AVFoundation框架實現相機拍照和錄制視頻，代碼簡明扼要并且容易理解，絕對能使你眼前一亮，通過這篇文章的詳細介紹希望你能有所收獲。

這里是Demo

首先聲明以下對象：

#import "CustomeCameraViewController.h" 
#import <AVFoundation/AVFoundation.h> 
#import <AssetsLibrary/AssetsLibrary.h> 
 
@interface CustomeCameraViewController ()<AVCaptureFileOutputRecordingDelegate> 
 
{ 
 // AVCaptureSession對象來執(zhí)行輸入設備和輸出設備之間的數據傳遞 
 AVCaptureSession *iSession; 
 //當前設備 
 AVCaptureDevice *iDevice; 
 //輸入設備 
 AVCaptureDeviceInput *iDeviceInput; 
 //照片輸出流 
 AVCaptureStillImageOutput *iStillImageOutput; 
 //預覽圖層 
 AVCaptureVideoPreviewLayer *iPreviewLayer; 
  
}

初始化各對象:

-(void)viewDidLoad { 
 [super viewDidLoad]; 
  
 //點擊屏幕對焦 
 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 后置攝像頭 
  //AVCaptureDevicePositionFront 前置攝像頭 
  if (device.position == AVCaptureDevicePositionBack) { 
   iDevice = device; 
  } 
 } 
  
  
 iSession.sessionPreset = [self getSessionPresetForDevice:iDevice]; 
  
 iDeviceInput = [[AVCaptureDeviceInput alloc]initWithDevice:iDevice error:nil]; 
  
  
 ////輸出設置。AVVideoCodecJPEG 輸出jpeg格式圖片 
 iStillImageOutput = [[AVCaptureStillImageOutput alloc]init]; 
 NSDictionary *outputDic = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey, nil nil]; 
 [iStillImageOutput setOutputSettings:outputDic]; 
  
  
 //更改這個設備設置的時候必須先鎖定設備，修改完后再解鎖，否則崩潰 
 [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]; 
 } 
  
 //初始化預覽圖層 
 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];  
  
}

點擊按鈕拍照：

//拍照 
-(void)takePictures{ 
 AVCaptureConnection *connection = [iStillImageOutput connectionWithMediaType:AVMediaTypeVideo]; 
 if (!connection) { 
  NSLog(@"失敗"); 
  return; 
 } 
 //設置焦距 
 [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]; 
   
   
 }]; 
}

image即為拍照所得圖片.

設置session的AVCaptureSessionPreset屬性

-(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; 
 } 
}

設置閃光燈:

- (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]; 
  
}

切換前置攝像頭與后置攝像頭:

- (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]; 
 } 
  
  
}

點擊屏幕對焦：

//點擊屏幕對焦 
-(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; 
  }]; 
 }]; 
}

關于視頻錄制可以在Demo中查看。

上述內容就是如何用AVFoundation框架實現相機拍照和錄制視頻，你們學到知識或技能了嗎？如果還想學到更多技能或者豐富自己的知識儲備，歡迎關注億速云行業(yè)資訊頻道。

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