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iOS自定义相机实现拍照、录制视频
来源：jb51　　时间：2019/4/22 8:38:00　　对本文有异议

本文实例为大家分享了iOS自定义相机实现拍照、录制视频的具体代码，供大家参考，具体内容如下

使用AVFoundation框架。

这里是Demo

首先声明以下对象：

  1. #import "CustomeCameraViewController.h"
  2. #import <AVFoundation/AVFoundation.h>
  3. #import <AssetsLibrary/AssetsLibrary.h>
  4.  
  5. @interface CustomeCameraViewController ()<AVCaptureFileOutputRecordingDelegate>
  6.  
  7. {
  8.   // AVCaptureSession对象来执行输入设备和输出设备之间的数据传递
  9.   AVCaptureSession *iSession;
  10.   //当前设备
  11.   AVCaptureDevice *iDevice;
  12.   //输入设备
  13.   AVCaptureDeviceInput *iDeviceInput;
  14.   //照片输出流
  15.   AVCaptureStillImageOutput *iStillImageOutput;
  16.   //预览图层
  17.   AVCaptureVideoPreviewLayer *iPreviewLayer;
  18.   
  19. }

初始化各对象：

  1. - (void)viewDidLoad {
  2.   [super viewDidLoad];
  3.   
  4.   //点击屏幕对焦
  5.   UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(focusTap:)];
  6.   [self.view addGestureRecognizer:tap];
  7.   
  8.   
  9.   iSession = [[AVCaptureSession alloc]init];
  10.   
  11.   NSArray *deviceArray = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
  12.   for (AVCaptureDevice *device in deviceArray) {
  13.     
  14.     //AVCaptureDevicePositionBack 后置摄像头
  15.     //AVCaptureDevicePositionFront 前置摄像头
  16.     if (device.position == AVCaptureDevicePositionBack) {
  17.       iDevice = device;
  18.     }
  19.   }
  20.   
  21.   
  22.   iSession.sessionPreset = [self getSessionPresetForDevice:iDevice];
  23.   
  24.   iDeviceInput = [[AVCaptureDeviceInput alloc]initWithDevice:iDevice error:nil];
  25.   
  26.   
  27.   ////输出设置。AVVideoCodecJPEG  输出jpeg格式图片
  28.   iStillImageOutput = [[AVCaptureStillImageOutput alloc]init];
  29.   NSDictionary *outputDic = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey, nil];
  30.   [iStillImageOutput setOutputSettings:outputDic];
  31.   
  32.   
  33.   //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
  34.   [iDevice lockForConfiguration:nil];
  35.   if ([iDevice isFlashModeSupported:AVCaptureFlashModeOff]) {
  36.     [iDevice setFlashMode:AVCaptureFlashModeOff];
  37.   }
  38.   if ([iDevice isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
  39.     [iDevice setFocusMode:AVCaptureFocusModeAutoFocus];
  40.   }
  41.   if ([iDevice isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeAutoWhiteBalance]) {
  42.     [iDevice setWhiteBalanceMode:AVCaptureWhiteBalanceModeAutoWhiteBalance];
  43.   }
  44.   [iDevice unlockForConfiguration];
  45.   
  46.   if ([iSession canAddInput:iDeviceInput]) {
  47.     [iSession addInput:iDeviceInput];
  48.   }
  49.   if ([iSession canAddOutput:iStillImageOutput]) {
  50.     [iSession addOutput:iStillImageOutput];
  51.   }
  52.   if ([iSession canAddOutput:iVideoOutput]) {
  53.     [iSession addOutput:iVideoOutput];
  54.   }
  55.   
  56.   //初始化预览图层
  57.   iPreviewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:iSession];
  58.   [iPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];
  59.   iPreviewLayer.frame = CGRectMake(0, 60, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height-160);
  60.   [self.iCameraView.layer addSublayer:iPreviewLayer];
  61.   
  62.   [iSession startRunning];
  63.   
  64.   
  65. }

点击按钮拍照：

  1. //拍照
  2. -(void)takePictures{
  3.   AVCaptureConnection *connection = [iStillImageOutput connectionWithMediaType:AVMediaTypeVideo];
  4.   if (!connection) {
  5.     NSLog(@"失败");
  6.     return;
  7.   }
  8.   //设置焦距
  9.   [connection setVideoScaleAndCropFactor:1];
  10.   
  11.   [iStillImageOutput captureStillImageAsynchronouslyFromConnection:connection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {
  12.     if (imageDataSampleBuffer==NULL) {
  13.       NSLog(@"NUll");
  14.       return ;
  15.     }
  16.     
  17.     NSData *data = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
  18.     UIImage *image = [UIImage imageWithData:data];
  19.     
  20.     
  21.   }];
  22. }

image即为拍照所得图片：

设置session的AVCaptureSessionPreset属性

  1. -(NSString *)getSessionPresetForDevice:(AVCaptureDevice *)device{
  2.   if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset3840x2160]) {
  3.     return AVCaptureSessionPreset3840x2160;
  4.   } else if([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset1920x1080]){
  5.     return AVCaptureSessionPreset1920x1080;
  6.   } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset1280x720]){
  7.     return AVCaptureSessionPreset1280x720;
  8.   } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset640x480]){
  9.     return AVCaptureSessionPreset640x480;
  10.   } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPreset352x288]){
  11.     return AVCaptureSessionPreset352x288;
  12.   } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPresetHigh]){
  13.     return AVCaptureSessionPresetHigh;
  14.   } else if ([device supportsAVCaptureSessionPreset:AVCaptureSessionPresetMedium]){
  15.     return AVCaptureSessionPresetMedium;
  16.   } else{
  17.     return AVCaptureSessionPresetLow;
  18.   }
  19. }

设置闪光灯：

  1. - (IBAction)iFlashBtn:(id)sender {
  2.   
  3.   [iDevice lockForConfiguration:nil];
  4.   if (iDevice.flashMode == AVCaptureFlashModeOff) {
  5.     if ([iDevice isFlashModeSupported:AVCaptureFlashModeOn]) {
  6.       [iDevice setFlashMode:AVCaptureFlashModeOn];
  7.       
  8.       [self.iFlashBtn setBackgroundImage:[UIImage imageNamed:@"flashBtn"] forState:UIControlStateNormal];
  9.     }
  10.   } else if (iDevice.flashMode == AVCaptureFlashModeOn){
  11.     if ([iDevice isFlashModeSupported:AVCaptureFlashModeOff]) {
  12.       [iDevice setFlashMode:AVCaptureFlashModeOff];
  13.       
  14.        [self.iFlashBtn setBackgroundImage:[UIImage imageNamed:@"flashOffBtn"] forState:UIControlStateNormal];
  15.     }
  16.   }
  17.   [iDevice unlockForConfiguration];
  18.   
  19. }

切换前置摄像头与后置摄像头：

  1. - (IBAction)iChangeBtn:(id)sender {
  2.   
  3.   
  4.   NSArray *array = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
  5.   AVCaptureDevice *newDevice = nil;
  6.   AVCaptureDeviceInput *newDeviceInput = nil;
  7.   
  8.   CATransition *animation = [CATransition animation];
  9.   animation.duration = 0.5f;
  10.   animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
  11.   animation.type = @"oglFlip";
  12.   
  13.   if (iDevice.position == AVCaptureDevicePositionBack) {
  14.     animation.subtype = kCATransitionFromLeft;
  15.     for (AVCaptureDevice *device in array) {
  16.       if (device.position == AVCaptureDevicePositionFront) {
  17.         newDevice = device;
  18.       }
  19.     }
  20.   } else if (iDevice.position == AVCaptureDevicePositionFront){
  21.     animation.subtype = kCATransitionFromRight;
  22.     for (AVCaptureDevice *device in array) {
  23.       if (device.position == AVCaptureDevicePositionBack) {
  24.         newDevice = device;
  25.       }
  26.     }
  27.   }
  28.   
  29.   newDeviceInput = [AVCaptureDeviceInput deviceInputWithDevice:newDevice error:nil];
  30.   [iPreviewLayer addAnimation:animation forKey:nil];
  31.   if (newDeviceInput!=nil) {
  32.     [iSession beginConfiguration];
  33.     [iSession removeInput:iDeviceInput];
  34.      iSession.sessionPreset = [self getSessionPresetForDevice:newDevice];
  35.     if ([iSession canAddInput:newDeviceInput]) {
  36.       [iSession addInput:newDeviceInput];
  37.       iDeviceInput = newDeviceInput;
  38.       iDevice = newDevice;
  39.     } else {
  40.       [iSession addInput:iDeviceInput];
  41.     }
  42.     [iSession commitConfiguration];
  43.   }
  44.   
  45.   
  46. }

点击屏幕对焦：

  1. //点击屏幕对焦
  2. -(void)focusTap:(UIGestureRecognizer *)tap{
  3.   CGPoint tapPoint = [tap locationInView:self.view];
  4.   
  5.   
  6.   float Y = tapPoint.y;
  7.   if (Y<60 || Y>([UIScreen mainScreen].bounds.size.height-100)) {
  8.     return;
  9.   }
  10.   
  11.   [iDevice lockForConfiguration:nil];
  12.   if ([iDevice isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
  13.     [iDevice setFocusPointOfInterest:CGPointMake(tapPoint.x/self.view.frame.origin.x, tapPoint.y/self.view.frame.origin.y)];
  14.     [iDevice setFocusMode:AVCaptureFocusModeAutoFocus];
  15.   }
  16.   [iDevice unlockForConfiguration];
  17.   
  18.   self.iFocusImgView.center = tapPoint;
  19.   self.iFocusImgView.hidden = NO;
  20.   [UIView animateWithDuration:0.3 animations:^{
  21.     self.iFocusImgView.transform = CGAffineTransformMakeScale(1.25, 1.25);
  22.   }completion:^(BOOL finished) {
  23.     [UIView animateWithDuration:0.5 animations:^{
  24.       self.iFocusImgView.transform = CGAffineTransformIdentity;
  25.     } completion:^(BOOL finished) {
  26.       self.iFocusImgView.hidden = YES;
  27.     }];
  28.   }];
  29. }

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w3xue。

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