怎么在iOS中自定义相机实现拍照、录制视频

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首先声明以下对象：

#import "CustomeCameraViewController.h"
#import 
#import 
 
@interface CustomeCameraViewController ()
 
{
  // 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];
  [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;
    }];
  }];
}

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