iOS框架AVFoundation实现相机拍照、录制视频

本文实例为大家分享了使用AVFoundation框架实现相机拍照、录制视频的具体代码，供大家参考，具体内容如下

这里是Demo

首先声明以下对象：

#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; 

} 

初始化各对象:

-(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];  

}

点击按钮拍照：

//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]; 

 }];
}

image即为拍照所得图片.

设置session的AVCaptureSessionPreset属性

-(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;
 }
}

设置闪光灯:

- (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]; 

}

切换前置摄像头与后置摄像头:

- (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：

//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;
  }];
 }];
}

关于视频录制可以在Demo中查看。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。