How to customize the camera to take photos and record videos in iOS
This article mainly introduces how iOS custom camera to achieve photography, recording video, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to know about it.
The details are as follows
Use the AVFoundation framework.
First declare the following objects:
# import "CustomeCameraViewController.h" # import # import @ interface CustomeCameraViewController () {/ / AVCaptureSession object to perform data transfer between input device and output device AVCaptureSession * iSession; / / current device AVCaptureDevice * iDevice; / / input device AVCaptureDeviceInput * iDeviceInput; / / Photo output stream AVCaptureStillImageOutput * iStillImageOutput; / / Preview layer AVCaptureVideoPreviewLayer * iPreviewLayer;}
Initialize each object:
-(void) viewDidLoad {[super viewDidLoad]; / / Click screen focus 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 rear camera / / AVCaptureDevicePositionFront front camera if (device.position = AVCaptureDevicePositionBack) {iDevice = device }} iSession.sessionPreset = [self getSessionPresetForDevice:iDevice]; iDeviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:iDevice error:nil]; / output settings. AVVideoCodecJPEG output jpeg format image iStillImageOutput = [[AVCaptureStillImageOutput alloc] init]; NSDictionary * outputDic = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey, nil]; [iStillImageOutput setOutputSettings:outputDic]; / / when changing the settings of this device, you must lock the device first, modify it and then unlock it, otherwise crash [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];} / / initialize the preview layer 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];}
Click the button to take a picture:
/ / take a picture-(void) takePictures {AVCaptureConnection * connection = [iStillImageOutput connectionWithMediaType:AVMediaTypeVideo]; if (! connection) {NSLog (@ "failure"); return;} / / set focal length [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 is the picture obtained by taking a photo:
Set the AVCaptureSessionPreset property of session
-(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;}}
Set up the flash:
-(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];}
Switch between the front camera and the rear camera:
-(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 (newDeviceInputCompanynil) {[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];}}
Click the screen to focus:
/ / Click the screen focus-(void) focusTap: (UIGestureRecognizer *) tap {CGPoint tapPoint = [tap locationInView:self.view]; float Y = tapPoint.y; if (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;}] Thank you for reading this article carefully. I hope the article "how to customize iOS camera to take photos and record videos" shared by the editor will be helpful to you. At the same time, I also hope you will support us and follow the industry information channel. More related knowledge is waiting for you to learn!
