一.初衷
看到各种APP的自定义相机界面,之后再看我们自己的APP全是用的系统相机,感觉有点遗憾,就简单写了一下.
二.简单代码(用的是AVFoundation)
#import "CustomCameraViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "PhotoHandleViewController.h"
@interface CustomCameraViewController ()<AVCaptureMetadataOutputObjectsDelegate,AVCapturePhotoCaptureDelegate>
// 捕获设备,前置,后置摄像头,麦克风
@property (nonatomic,strong) AVCaptureDevice *device;
@property (nonatomic,strong) AVCapturePhotoSettings *settings;
// 输入设备
@property (nonatomic,strong) AVCaptureDeviceInput *input;
@property (nonatomic,strong) AVCaptureMetadataOutput *output;
// 输出图片
@property (nonatomic,strong) AVCapturePhotoOutput *photoOutput;
// 摄像头
@property (nonatomic,strong) AVCaptureSession *session;
// 实时显示捕获的图像
@property (nonatomic,strong) AVCaptureVideoPreviewLayer *layer;
// 聚焦点
@property (nonatomic,strong) UIView *focusView;
@end
初始化自定义相机
- (void)customCamera {
// AVMediaTypeVideo 代表视频 (默认使用后置);
self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// 设备输入
self.input = [[AVCaptureDeviceInput alloc] initWithDevice:self.device error:nil];
// 输出对象
self.output = [[AVCaptureMetadataOutput alloc] init];
self.photoOutput = [[AVCapturePhotoOutput alloc] init];
// 会话 结合输入输出
self.session = [[AVCaptureSession alloc] init];
if ([self.session canSetSessionPreset:AVCaptureSessionPreset1280x720]) {
self.session.sessionPreset = AVCaptureSessionPreset1280x720;
}
if ([self.session canAddInput:self.input]) {
[self.session addInput:self.input];
}
if ([self.session canAddOutput:self.photoOutput]) {
[self.session addOutput:self.photoOutput];
}
// 预览
self.layer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
self.layer.frame = CGRectMake(20, 70, self.view.frame.size.width - 40, self.view.frame.size.height / 2);
self.layer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.view.layer addSublayer:self.layer];
// 开始启动
[self.session startRunning];
if ([self.device lockForConfiguration:nil]) {
if ([self.device isFlashModeSupported:AVCaptureFlashModeAuto]) {
[self.device setFlashMode:AVCaptureFlashModeAuto];
}
// 自动白平衡
if ([self.device isWhiteBalanceModeSupported:AVCaptureWhiteBalanceModeAutoWhiteBalance]) {
[self.device setWhiteBalanceMode:AVCaptureWhiteBalanceModeAutoWhiteBalance];
}
[self.device unlockForConfiguration];
}
}
聚焦点
// 聚焦点
- (void)focusGesture:(UITapGestureRecognizer *)recognizer {
CGPoint point = [recognizer locationInView:recognizer.view];
[self focusAtPoint:point];
}
- (void)focusAtPoint:(CGPoint)point {
CGSize size = self.view.bounds.size;
CGPoint focusPoint = CGPointMake(point.y / size.height, 1 - point.x / size.width);
NSError *error;
if ([self.device lockForConfiguration:&error]) {
if ([self.device isFocusModeSupported:AVCaptureFocusModeAutoFocus]) {
[self.device setFocusPointOfInterest:focusPoint];
[self.device setFocusMode:AVCaptureFocusModeAutoFocus];
}
if ([self.device isExposureModeSupported:AVCaptureExposureModeAutoExpose]) {
[self.device setExposurePointOfInterest:focusPoint];
[self.device setExposureMode:AVCaptureExposureModeAutoExpose];
}
[self.device unlockForConfiguration];
}
_focusView.center = point;
_focusView.hidden = NO;
[UIView animateWithDuration:0.3 animations:^{
_focusView.transform = CGAffineTransformMakeScale(1.25, 1.25);
} completion:^(BOOL finished) {
[UIView animateWithDuration:0.5 animations:^{
_focusView.transform = CGAffineTransformIdentity;
} completion:^(BOOL finished) {
_focusView.hidden = YES;
}];
}];
}
截取图片
- (void)shutterCamera {
AVCaptureConnection *videoConnection = [self.photoOutput connectionWithMediaType:AVMediaTypeVideo];
if (!videoConnection) {
NSLog(@"拍照失败");
return;
}
[self.photoOutput capturePhotoWithSettings:self.settings delegate:self];
}
- (void)captureOutput:(AVCapturePhotoOutput *)captureOutput didFinishProcessingPhotoSampleBuffer:(nullable CMSampleBufferRef)photoSampleBuffer previewPhotoSampleBuffer:(nullable CMSampleBufferRef)previewPhotoSampleBuffer resolvedSettings:(AVCaptureResolvedPhotoSettings *)resolvedSettings bracketSettings:(nullable AVCaptureBracketedStillImageSettings *)bracketSettings error:(nullable NSError *)error {
if (photoSampleBuffer == NULL) {
return;
}
NSData *imgData = [AVCapturePhotoOutput JPEGPhotoDataRepresentationForJPEGSampleBuffer:photoSampleBuffer previewPhotoSampleBuffer:previewPhotoSampleBuffer];
// 照片处理界面
PhotoHandleViewController *photoVC = [[PhotoHandleViewController alloc] init];
photoVC.img = [UIImage imageWithData:imgData];
[self.navigationController pushViewController:photoVC animated:YES];
}
照片处理PhotoHandleViewController
#import "PhotoHandleViewController.h"
#import "CustomCollectionViewCell.h"
@interface PhotoHandleViewController () <UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>
@property (nonatomic,strong) UICollectionView *bottomC;
@property (nonatomic,strong) NSMutableArray *filterArray;
@property (nonatomic,strong) UIImageView *imgV;
@end
self.imgV = [[UIImageView alloc] initWithFrame:CGRectMake(20, 70, self.view.frame.size.width - 40, self.view.frame.size.height / 2)];
self.imgV.image = self.img;
self.imgV.contentMode = UIViewContentModeScaleAspectFill;
self.imgV.clipsToBounds = YES;
[self.view addSubview:self.imgV];
// 滤镜效果
self.filterArray = [[NSMutableArray alloc] initWithObjects:
@"OriginImage",
@"CIPhotoEffectChrome",
@"CIPhotoEffectFade",
@"CIPhotoEffectInstant",
@"CIPhotoEffectProcess",
@"CIPhotoEffectTransfer",
@"CISRGBToneCurveToLinear",
@"CIColorInvert",
@"CIColorPosterize",
@"CIFalseColor",
@"CIXRay",
@"CIThermal",
@"CISepiaTone",
@"CIColorMonochrome",
nil];
UICollectionViewFlowLayout *flowLay = [[UICollectionViewFlowLayout alloc] init];
flowLay.itemSize = CGSizeMake(100, 150);
flowLay.scrollDirection = UICollectionViewScrollDirectionHorizontal;
self.bottomC = [[UICollectionView alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(self.imgV.frame) + 20, self.view.frame.size.width, 200) collectionViewLayout:flowLay];
self.bottomC.backgroundColor = [UIColor whiteColor];
self.bottomC.delegate = self;
self.bottomC.dataSource = self;
[self.view addSubview:self.bottomC];
[self.bottomC registerClass:[CustomCollectionViewCell class] forCellWithReuseIdentifier:@"cell"];
处理滤镜
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath {
[self fliterEvent:self.filterArray[indexPath.item]];
}
#pragma mark 滤镜处理事件
- (void)fliterEvent:(NSString *)filterName
{
if ([filterName isEqualToString:@"OriginImage"]) {
self.imgV.image = self.img;
}else{
//将UIImage转换成CIImage
CIImage *ciImage = [[CIImage alloc] initWithImage:[self fixOrientation:self.img]];
//创建滤镜
CIFilter *filter = [CIFilter filterWithName:filterName keysAndValues:kCIInputImageKey, ciImage, nil];
//已有的值不改变，其他的设为默认值
[filter setDefaults];
//获取绘制上下文
CIContext *context = [CIContext contextWithOptions:nil];
//渲染并输出CIImage
CIImage *outputImage = [filter outputImage];
//创建CGImage句柄
CGImageRef cgImage = [context createCGImage:outputImage fromRect:[outputImage extent]];
//获取图片
UIImage *image = [UIImage imageWithCGImage:cgImage];
//释放CGImage句柄
CGImageRelease(cgImage);
self.imgV.image = image;
}
}
此非常之重要
// 由于通过cgimageref 得到的图片 会逆时针转90度的,因此用以下方法得到正确图片
#pragma mark -------
- (UIImage *)fixOrientation:(UIImage *)aImage {
// No-op if the orientation is already correct
if (aImage.imageOrientation == UIImageOrientationUp)
return aImage;
// We need to calculate the proper transformation to make the image upright.
// We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
CGAffineTransform transform = CGAffineTransformIdentity;
switch (aImage.imageOrientation) {
case UIImageOrientationDown:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
break;
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
default:
break;
}
switch (aImage.imageOrientation) {
case UIImageOrientationUpMirrored:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationLeftMirrored:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
default:
break;
}
// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
CGImageGetBitsPerComponent(aImage.CGImage), 0,
CGImageGetColorSpace(aImage.CGImage),
CGImageGetBitmapInfo(aImage.CGImage));
CGContextConcatCTM(ctx, transform);
switch (aImage.imageOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
// Grr...
CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);
break;
default:
CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);
break;
}
// And now we just create a new UIImage from the drawing context
CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
UIImage *img = [UIImage imageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;
}
最后附上demo地址:https://github.com/HuixiaZhang/CustomCamera
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