iOS AVFoundation／AVCaptureSession实现自定义相机界面拍照（四）拍照、自定义裁剪框、图片查看器

本文主要是介绍iOS AVFoundation／AVCaptureSession实现自定义相机界面拍照（四）拍照、自定义裁剪框、图片查看器，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

----参考框架：

a122273328/Camera

https://blog.csdn.net/aa122273328/article/details/72886022

https://github.com/a122273328/Camera

从系统相册选择照片后，自定义裁剪框：

LazyDuan/LDImagePicker

图片查看器：PYPhotoBrowser    https://github.com/ko1o/PYPhotoBrowser

MWPhotoBrowser  ：https://github.com/mwaterfall/MWPhotoBrowser

-----------自定义裁剪框的步骤：-----------

1.当我们实现了UIImagePickerController的代理后，需要在 imagePickerController：didFinishPickingMediaWithInfo：

imagePickerController.allowsEditing = true; 如果为true，就不会展现我们自己的裁剪视图了，就无法自定义了

2.跳转到自定义的控制器中去，吧从相册中的获取的图片传递到控制器中；

 UIImage *originImage = info[@"UIImagePickerControllerOriginalImage"];

    ImagePickerCropViewController *vc = [[ImagePickerCropViewController alloc] init];

    vc.originImage = originImage;

    [picker pushViewController:vc animated:true];

3.在控制器中用一个Imageview显示图片，然后给imageview添加手势；实现缩放；最后保存；

************

#import "ViewController.h"
#import "ImagePickerCropViewController.h"@interface ViewController () <UINavigationControllerDelegate, UIImagePickerControllerDelegate>@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];}- (IBAction)choosePhotot:(id)sender {UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
//     imagePickerController.allowsEditing = true; 如果为true，就不会展现我们自己的裁剪视图了，就无法自定义了imagePickerController.delegate = self;[self presentViewController:imagePickerController animated:true completion:nil];}- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info {UIImage *originImage = info[@"UIImagePickerControllerOriginalImage"];ImagePickerCropViewController *vc = [[ImagePickerCropViewController alloc] init];vc.originImage = originImage;[picker pushViewController:vc animated:true];
}- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {[picker dismissViewControllerAnimated:true completion:nil];
}@end

#import <UIKit/UIKit.h>@interface ImagePickerCropViewController : UIViewController@property (nonatomic, strong) UIImage *originImage;@end

#import "ImagePickerCropViewController.h"@interface ImagePickerCropViewController ()@property (nonatomic, strong) UIImageView *cropImageView;@end@implementation ImagePickerCropViewController- (void)viewDidLoad {[super viewDidLoad];self.view.backgroundColor = [UIColor blackColor];UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(save)];self.navigationItem.rightBarButtonItem = item;CGRect frame = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height - 44);self.cropImageView = [[UIImageView alloc] initWithFrame:frame];_cropImageView.contentMode = UIViewContentModeScaleAspectFit;[_cropImageView setImage:self.originImage];_cropImageView.userInteractionEnabled = true;[self.view addSubview:_cropImageView];UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];[self.cropImageView addGestureRecognizer:pan];UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(handlePinch:)];[self.cropImageView addGestureRecognizer:pinch];UIView *maskView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];maskView.center = self.view.center;maskView.backgroundColor = [UIColor clearColor];maskView.layer.borderWidth = 0.5;maskView.layer.borderColor = [UIColor whiteColor].CGColor;[self.view addSubview:maskView];}- (void)handlePinch:(UIPinchGestureRecognizer *)recognizer {CGFloat scale = recognizer.scale;recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, scale, scale); //在已缩放大小基础下进行累加变化；区别于：使用 CGAffineTransformMakeScale 方法就是在原大小基础下进行变化recognizer.scale = 1.0;
}- (void)handlePan:(UIPanGestureRecognizer *)recognizer {if (recognizer.state != UIGestureRecognizerStateEnded && recognizer.state != UIGestureRecognizerStateFailed){CGPoint translation = [recognizer translationInView:self.view];CGPoint center = self.cropImageView.center;self.cropImageView.center = CGPointMake(center.x + translation.x, center.y + translation.y);[recognizer setTranslation:CGPointMake(0, 0) inView:self.view];}
}- (UIImage *)captureScreen {UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];CGRect rect = [keyWindow bounds];UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0);CGContextRef context = UIGraphicsGetCurrentContext();[keyWindow.layer renderInContext:context];UIImage *img = UIGraphicsGetImageFromCurrentImageContext();img = [UIImage imageWithCGImage:CGImageCreateWithImageInRect(img.CGImage, CGRectMake((self.view.center.x-100)*2+2, (self.view.center.y-100)*2+2, 400-4, 400-4))];UIGraphicsEndImageContext();return img;
}- (void)save {UIImageWriteToSavedPhotosAlbum([self captureScreen], nil, nil, nil);
}- (void)didReceiveMemoryWarning {[super didReceiveMemoryWarning];
}@end

----------------------

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

#import <AssetsLibrary/AssetsLibrary.h>//写入相册需要的

@interface ViewController ()<UIGestureRecognizerDelegate>

/**

 *  AVCaptureSession对象来执行输入设备和输出设备之间的数据传递

 */

@property (nonatomic,strong)AVCaptureSession* session;

/**

 *  输入设备

 */

@property (nonatomic,strong)AVCaptureDeviceInput* videoInput;

/**

 *  照片输出流

 */

@property (nonatomic,strong)AVCaptureStillImageOutput* stillImageOutput;//10.0以前

//@property (nonatomic, strong) AVCapturePhotoOutput* stillImageOutput;//10.0以后

/**

 *  预览图层

 */

@property (nonatomic,strong)AVCaptureVideoPreviewLayer* previewLayer;

@property (strong,nonatomic) UIButton *captureBtn;//拍照按钮

@property (strong,nonatomic)UIButton *openCaptureBtn;//打开摄像头按钮

@property(nonatomic,assign)BOOL isUsingFrontFacingCamera;//切换镜头

/**

 *  记录开始的缩放比例

 */

@property(nonatomic,assign)CGFloat beginGestureScale;

/**

 *  最后的缩放比例

 */

@property(nonatomic,assign)CGFloat effectiveScale;

@end

@implementation ViewController

-(void)takeCapture{

    [selftakePhotoButtonClick:nil];//拍照

}

-(void)openCapture{

}

-(void)flashBtn{

    [selfflashButtonClick:nil];//闪光灯

}

-(void)glassBtn{

    [selfswitchCameraSegmentedControlClick:nil];//切换镜头

}

- (void)viewDidLoad {

    [superviewDidLoad];

    [selfsetUpGesture];

    UIButton *captureBtn=[[UIButtonalloc]initWithFrame:CGRectMake(30,300,60,30)];

    self.captureBtn=captureBtn;

    captureBtn.backgroundColor=[UIColorblueColor];

    captureBtn.titleLabel.textColor=[UIColorgreenColor];

    [captureBtn setTitle:@"拍照"forState:UIControlStateNormal];

    [captureBtn addTarget:self action:@selector(takeCapture)forControlEvents:UIControlEventTouchDown];

    [self.viewaddSubview:captureBtn];

    

    UIButton *openCaptureBtn=[[UIButtonalloc]initWithFrame:CGRectMake(30,380,60,30)];

    self.openCaptureBtn=openCaptureBtn;

    openCaptureBtn.backgroundColor=[UIColorblueColor];

    [openCaptureBtn setTitle:@"摄像"forState:UIControlStateNormal];

    [openCaptureBtn addTarget:selfaction:@selector(openCapture)forControlEvents:UIControlEventTouchDown];

    [self.viewaddSubview:openCaptureBtn];

    

    UIButton *flashBtn=[[UIButtonalloc]initWithFrame:CGRectMake(30,420,60,30)];

    flashBtn.backgroundColor=[UIColorblueColor];

    [flashBtn setTitle:@"闪光灯"forState:UIControlStateNormal];

    [flashBtn addTarget:selfaction:@selector(flashBtn)forControlEvents:UIControlEventTouchDown];

    [self.viewaddSubview:flashBtn];

    UIButton *glassBtn=[[UIButtonalloc]initWithFrame:CGRectMake(30,480,60,30)];

    

    glassBtn.backgroundColor=[UIColorblueColor];

    [glassBtn setTitle:@"切换摄像头"forState:UIControlStateNormal];

    [glassBtn addTarget:selfaction:@selector(glassBtn)forControlEvents:UIControlEventTouchDown];

    [self.viewaddSubview:glassBtn];

        [selfinitAVCaptureSession];

//    self.openCaptureBtn.hidden = NO;

//    self.captureBtn.hidden = YES;

}

//闪光灯的设置非常简单，只需要修改device的flashMode属性即可，这里需要注意的是，修改device时候需要先锁住，修改完成后再解锁，否则会崩溃，设置闪光灯的时候也需要做安全判断，验证设备是否支持闪光灯，有些iOS设备是没有闪光灯的，如果不做判断还是会crash掉

- (void)flashButtonClick:(UIBarButtonItem *)sender {

    

    NSLog(@"flashButtonClick");

    //mediatype类型： AVMediaTypeVideo, AVMediaTypeAudio, or AVMediaTypeMuxed

    AVCaptureDevice *device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];

    

    //修改前必须先锁定

    [device lockForConfiguration:nil];

    //必须判定是否有闪光灯，否则如果没有闪光灯会崩溃

    if ([devicehasFlash]) {

        device.flashMode =AVCaptureFlashModeOn;

//        if (device.flashMode == AVCaptureFlashModeOff) {

//            device.flashMode = AVCaptureFlashModeOn;

//            

            [sender setTitle:@"flashOn"];

//        } else if (device.flashMode == AVCaptureFlashModeOn) {

//            device.flashMode = AVCaptureFlashModeAuto;

            [sender setTitle:@"flashAuto"];

//        } else if (device.flashMode == AVCaptureFlashModeAuto) {

//            device.flashMode = AVCaptureFlashModeOff;

            [sender setTitle:@"flashOff"];

//        }

        

    } else {

        

        NSLog(@"设备不支持闪光灯");

    }

    [device unlockForConfiguration];

}

#pragma 创建手势

- (void)setUpGesture{

    

    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizeralloc]initWithTarget:selfaction:@selector(handlePinchGesture:)];

    pinch.delegate =self;

    [self.viewaddGestureRecognizer:pinch];

}

#pragma mark gestureRecognizer delegate

- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer

{

    if ( [gestureRecognizerisKindOfClass:[UIPinchGestureRecognizerclass]] ) {

        self.beginGestureScale =self.effectiveScale;

    }

    returnYES;

}

//缩放手势用于调整焦距

- (void)handlePinchGesture:(UIPinchGestureRecognizer *)recognizer{

    

    BOOL allTouchesAreOnThePreviewLayer =YES;

    NSUInteger numTouches = [recognizernumberOfTouches], i;//几个手指

    for ( i =0; i < numTouches; ++i ) {

        CGPoint location = [recognizerlocationOfTouch:iinView:self.view];//i是指第几个手指

        CGPoint convertedLocation = [self.previewLayerconvertPoint:locationfromLayer:self.previewLayer.superlayer];//吧self。view上的点转换到self.previewLayer上坐标

        if ( ! [self.previewLayercontainsPoint:convertedLocation] ) {

            allTouchesAreOnThePreviewLayer = NO;//如果self.view上的转换到preview的坐标不在preview上，设置NO

            break;

        }

    }

    

    if ( allTouchesAreOnThePreviewLayer ) {

        

        

        self.effectiveScale =self.beginGestureScale * recognizer.scale;//获取当前手势的缩放比例

        if (self.effectiveScale <1.0){

            self.effectiveScale =1.0;

        }

        

        NSLog(@"%f-------------->%f------------recognizerScale%f",self.effectiveScale,self.beginGestureScale,recognizer.scale);

        

        //获取最大缩放比例

        CGFloat maxScaleAndCropFactor = [[self.stillImageOutputconnectionWithMediaType:AVMediaTypeVideo]videoMaxScaleAndCropFactor];

        

        NSLog(@"%f",maxScaleAndCropFactor);

        //超过最大，取最大

        if (self.effectiveScale > maxScaleAndCropFactor)

            self.effectiveScale = maxScaleAndCropFactor;

   

        //layer层的隐式动画

        [CATransactionbegin];

        [CATransactionsetAnimationDuration:.025];

        [self.previewLayersetAffineTransform:CGAffineTransformMakeScale(self.effectiveScale,self.effectiveScale)];//缩放

        [CATransactioncommit];//提交动画

        

    }

    

}

//切换镜头

- (void)switchCameraSegmentedControlClick:(UISegmentedControl *)sender {

    

    NSLog(@"%ld",(long)sender.selectedSegmentIndex);

    

    AVCaptureDevicePosition desiredPosition;

    if (self.isUsingFrontFacingCamera){

        desiredPosition = AVCaptureDevicePositionBack;//摄像头位置在后面

    }else{

        desiredPosition = AVCaptureDevicePositionFront;//摄像头位置在前面

    }

    

    for (AVCaptureDevice *din [AVCaptureDevicedevicesWithMediaType:AVMediaTypeVideo]) {

        if ([dposition] == desiredPosition) {

            [self.previewLayer.sessionbeginConfiguration];//开启配置

            AVCaptureDeviceInput *input = [AVCaptureDeviceInputdeviceInputWithDevice:derror:nil];

            for (AVCaptureInput *oldInputinself.previewLayer.session.inputs) {

                [[self.previewLayersession]removeInput:oldInput];//移除旧的会话

            }

            [self.previewLayer.sessionaddInput:input];//新的输入关联会话

            [self.previewLayer.sessioncommitConfiguration];//重新配置后，会话重新提交配置

            break;

        }

    }

    

    self.isUsingFrontFacingCamera = !self.isUsingFrontFacingCamera;

}

- (void)initAVCaptureSession{

    

    self.session = [[AVCaptureSessionalloc]init];

    

    NSError *error;

    

    AVCaptureDevice *device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];

    

    //更改这个设置的时候必须先锁定设备，修改完后再解锁，否则崩溃

    [device lockForConfiguration:nil];

    //设置闪光灯为自动

    [device setFlashMode:AVCaptureFlashModeAuto];

    [device unlockForConfiguration];

    

    self.videoInput = [[AVCaptureDeviceInputalloc]initWithDevice:deviceerror:&error];

    if (error) {

        NSLog(@"%@",error);

    }

    self.stillImageOutput = [[AVCaptureStillImageOutputalloc]init];

    //输出设置。AVVideoCodecJPEG  输出jpeg格式图片

    NSDictionary * outputSettings = [[NSDictionaryalloc]initWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey,nil];

    [self.stillImageOutputsetOutputSettings:outputSettings];

    

    if ([self.sessioncanAddInput:self.videoInput]) {

        [self.sessionaddInput:self.videoInput];

    }

    if ([self.sessioncanAddOutput:self.stillImageOutput]) {

        [self.sessionaddOutput:self.stillImageOutput];

    }

    

    //初始化预览图层

    self.previewLayer = [[AVCaptureVideoPreviewLayeralloc]initWithSession:self.session];

    [self.previewLayersetVideoGravity:AVLayerVideoGravityResizeAspect];

    self.previewLayer.frame =CGRectMake(0,0,375,375 - 64);

    self.view.layer.masksToBounds = YES;

    [self.view.layeraddSublayer:self.previewLayer];

}

- (void)viewWillAppear:(BOOL)animated{

    

    [superviewWillAppear:YES];

    

    if (self.session) {

        

        [self.sessionstartRunning];//开启会话

    }

}

- (void)viewDidDisappear:(BOOL)animated{

    

    [superviewDidDisappear:YES];

    

    if (self.session) {

        

        [self.sessionstopRunning];

    }

}

//拍照，输出图片

- (void)takePhotoButtonClick:(UIBarButtonItem *)sender {

    //输出图像的时候需要用到AVCaptureConnection这个类，session通过AVCaptureConnection连接AVCaptureStillImageOutput进行图片输出，

    AVCaptureConnection *stillImageConnection = [self.stillImageOutput        connectionWithMediaType:AVMediaTypeVideo];

    UIDeviceOrientation curDeviceOrientation = [[UIDevicecurrentDevice]orientation];

    AVCaptureVideoOrientation avcaptureOrientation = [selfavOrientationForDeviceOrientation:curDeviceOrientation];

    [stillImageConnection setVideoOrientation:avcaptureOrientation];

//这个方法是控制焦距用的暂时先固定为1，后边写手势缩放焦距的时候会修改这里

    [stillImageConnection setVideoScaleAndCropFactor:1];

    

    [self.stillImageOutputcaptureStillImageAsynchronouslyFromConnection:stillImageConnectioncompletionHandler:^(CMSampleBufferRef imageDataSampleBuffer,NSError *error) {

    //获得图片数据

        NSData *jpegData = [AVCaptureStillImageOutputjpegStillImageNSDataRepresentation:imageDataSampleBuffer];

        

        CFDictionaryRef attachments =CMCopyDictionaryOfAttachments(kCFAllocatorDefault,

                                                                    imageDataSampleBuffer,

                                                                   kCMAttachmentMode_ShouldPropagate);

//

        

    // 写入相册之前需要判断用户是否允许了程序访问相册，否则程序会崩溃，包括在开启相机的时候和拍摄按钮点击的时候都需要做安全验证，验证设别是否支持拍照，用户是否允许程序访问相机。

//        ALAuthorizationStatus author = [ALAssetsLibrary authorizationStatus];

//        if (author == ALAuthorizationStatusRestricted || author == ALAuthorizationStatusDenied){

//            //无权限

//            return ;

//        }

//        ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

//        [library writeImageDataToSavedPhotosAlbum:jpegData metadata:(__bridge id)attachments completionBlock:^(NSURL *assetURL, NSError *error) {

//

//        }];

//        

    }];

    

     }

//设置方向,       照片写入相册之前需要进行旋转

-(AVCaptureVideoOrientation )avOrientationForDeviceOrientation:(UIDeviceOrientation)deviceOrientation

     {

         AVCaptureVideoOrientation result = (AVCaptureVideoOrientation)deviceOrientation;

         if ( deviceOrientation ==UIDeviceOrientationLandscapeLeft )

             result = AVCaptureVideoOrientationLandscapeRight;

         elseif ( deviceOrientation ==UIDeviceOrientationLandscapeRight )

             result = AVCaptureVideoOrientationLandscapeLeft;

         return result;

     }

@end

这篇关于iOS AVFoundation／AVCaptureSession实现自定义相机界面拍照（四）拍照、自定义裁剪框、图片查看器的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

---