iOS中 自定义系统相机 作者:韩俊强
需要框架:
#import <AVFoundation/AVFoundation.h>
#import <AssetsLibrary/AssetsLibrary.h>
布局如下:
相关属性:
#import "ViewController.h" #import <AVFoundation/AVFoundation.h> #import <AssetsLibrary/AssetsLibrary.h> typedef void(^PropertyChangeBlock)(AVCaptureDevice *captureDevice); @interface ViewController () @property (strong,nonatomic) AVCaptureSession *captureSession;//负责输入和输出设置之间的数据传递 @property (strong,nonatomic) AVCaptureDeviceInput *captureDeviceInput;//负责从AVCaptureDevice获得输入数据 @property (strong,nonatomic) AVCaptureStillImageOutput *captureStillImageOutput;//照片输出流 @property (strong,nonatomic) AVCaptureVideoPreviewLayer *captureVideoPreviewLayer;//相机拍摄预览图层 @property (weak, nonatomic) IBOutlet UIView *viewContainer; @property (weak, nonatomic) IBOutlet UIButton *takeButton;//拍照按钮 @property (weak, nonatomic) IBOutlet UIButton *flashAutoButton;//自动闪光灯按钮 @property (weak, nonatomic) IBOutlet UIButton *flashOnButton;//打开闪光灯按钮 @property (weak, nonatomic) IBOutlet UIButton *flashOffButton;//关闭闪光灯按钮 @property (weak, nonatomic) IBOutlet UIImageView *focusCursor; //聚焦光标 @end @implementation ViewController
#pragma mark - 控制器视图方法 - (void)viewDidLoad { [super viewDidLoad]; } -(void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated]; //初始化会话 _captureSession=[[AVCaptureSession alloc]init]; if ([_captureSession canSetSessionPreset:AVCaptureSessionPreset1280x720]) {//设置分辨率 _captureSession.sessionPreset=AVCaptureSessionPreset1280x720; } //获得输入设备 AVCaptureDevice *captureDevice=[self getCameraDeviceWithPosition:AVCaptureDevicePositionBack];//取得后置摄像头 if (!captureDevice) { NSLog(@"取得后置摄像头时出现问题."); return; } NSError *error=nil; //根据输入设备初始化设备输入对象,用于获得输入数据 _captureDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:captureDevice error:&error]; if (error) { NSLog(@"取得设备输入对象时出错,错误原因:%@",error.localizedDescription); return; } //初始化设备输出对象,用于获得输出数据 _captureStillImageOutput=[[AVCaptureStillImageOutput alloc]init]; NSDictionary *outputSettings = @{AVVideoCodecKey:AVVideoCodecJPEG}; [_captureStillImageOutput setOutputSettings:outputSettings];//输出设置 //将设备输入添加到会话中 if ([_captureSession canAddInput:_captureDeviceInput]) { [_captureSession addInput:_captureDeviceInput]; } //将设备输出添加到会话中 if ([_captureSession canAddOutput:_captureStillImageOutput]) { [_captureSession addOutput:_captureStillImageOutput]; } //创建视频预览层,用于实时展示摄像头状态 _captureVideoPreviewLayer=[[AVCaptureVideoPreviewLayer alloc]initWithSession:self.captureSession]; CALayer *layer=self.viewContainer.layer; layer.masksToBounds=YES; _captureVideoPreviewLayer.frame=layer.bounds; _captureVideoPreviewLayer.videoGravity=AVLayerVideoGravityResizeAspectFill;//填充模式 //将视频预览层添加到界面中 //[layer addSublayer:_captureVideoPreviewLayer]; [layer insertSublayer:_captureVideoPreviewLayer below:self.focusCursor.layer]; [self addNotificationToCaptureDevice:captureDevice]; [self addGenstureRecognizer]; [self setFlashModeButtonStatus]; } -(void)viewDidAppear:(BOOL)animated{ [super viewDidAppear:animated]; [self.captureSession startRunning]; } -(void)viewDidDisappear:(BOOL)animated{ [super viewDidDisappear:animated]; [self.captureSession stopRunning]; } -(void)dealloc{ [self removeNotification]; }
#pragma mark - UI方法 #pragma mark 拍照 - (IBAction)takeButtonClick:(UIButton *)sender { //根据设备输出获得连接 AVCaptureConnection *captureConnection=[self.captureStillImageOutput connectionWithMediaType:AVMediaTypeVideo]; //根据连接取得设备输出的数据 [self.captureStillImageOutput captureStillImageAsynchronouslyFromConnection:captureConnection completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) { if (imageDataSampleBuffer) { NSData *imageData=[AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer]; UIImage *image=[UIImage imageWithData:imageData]; UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil); // ALAssetsLibrary *assetsLibrary=[[ALAssetsLibrary alloc]init]; // [assetsLibrary writeImageToSavedPhotosAlbum:[image CGImage] orientation:(ALAssetOrientation)[image imageOrientation] completionBlock:nil]; } }]; } #pragma mark 切换前后摄像头 - (IBAction)toggleButtonClick:(UIButton *)sender { AVCaptureDevice *currentDevice=[self.captureDeviceInput device]; AVCaptureDevicePosition currentPosition=[currentDevice position]; [self removeNotificationFromCaptureDevice:currentDevice]; AVCaptureDevice *toChangeDevice; AVCaptureDevicePosition toChangePosition=AVCaptureDevicePositionFront; if (currentPosition==AVCaptureDevicePositionUnspecified||currentPosition==AVCaptureDevicePositionFront) { toChangePosition=AVCaptureDevicePositionBack; } toChangeDevice=[self getCameraDeviceWithPosition:toChangePosition]; [self addNotificationToCaptureDevice:toChangeDevice]; //获得要调整的设备输入对象 AVCaptureDeviceInput *toChangeDeviceInput=[[AVCaptureDeviceInput alloc]initWithDevice:toChangeDevice error:nil]; //改变会话的配置前一定要先开启配置,配置完成后提交配置改变 [self.captureSession beginConfiguration]; //移除原有输入对象 [self.captureSession removeInput:self.captureDeviceInput]; //添加新的输入对象 if ([self.captureSession canAddInput:toChangeDeviceInput]) { [self.captureSession addInput:toChangeDeviceInput]; self.captureDeviceInput=toChangeDeviceInput; } //提交会话配置 [self.captureSession commitConfiguration]; [self setFlashModeButtonStatus]; }
#pragma mark 自动闪光灯开启 - (IBAction)flashAutoClick:(UIButton *)sender { [self setFlashMode:AVCaptureFlashModeAuto]; [self setFlashModeButtonStatus]; }
#pragma mark 打开闪光灯 - (IBAction)flashOnClick:(UIButton *)sender { [self setFlashMode:AVCaptureFlashModeOn]; [self setFlashModeButtonStatus]; }
#pragma mark 关闭闪光灯 - (IBAction)flashOffClick:(UIButton *)sender { [self setFlashMode:AVCaptureFlashModeOff]; [self setFlashModeButtonStatus]; }
#pragma mark - 通知 /** * 给输入设备添加通知 */ -(void)addNotificationToCaptureDevice:(AVCaptureDevice *)captureDevice{ //注意添加区域改变捕获通知必须首先设置设备允许捕获 [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) { captureDevice.subjectAreaChangeMonitoringEnabled=YES; }]; NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter]; //捕获区域发生改变 [notificationCenter addObserver:self selector:@selector(areaChange:) name:AVCaptureDeviceSubjectAreaDidChangeNotification object:captureDevice]; }
/** * 移除所有通知 */ -(void)removeNotification{ NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter]; [notificationCenter removeObserver:self]; }
-(void)addNotificationToCaptureSession:(AVCaptureSession *)captureSession{ NSNotificationCenter *notificationCenter= [NSNotificationCenter defaultCenter]; //会话出错 [notificationCenter addObserver:self selector:@selector(sessionRuntimeError:) name:AVCaptureSessionRuntimeErrorNotification object:captureSession]; }
/** * 设备连接成功 * * @param notification 通知对象 */ -(void)deviceConnected:(NSNotification *)notification{ NSLog(@"设备已连接..."); }
/** * 设备连接断开 * * @param notification 通知对象 */ -(void)deviceDisconnected:(NSNotification *)notification{ NSLog(@"设备已断开."); }
/** * 捕获区域改变 * * @param notification 通知对象 */ -(void)areaChange:(NSNotification *)notification{ NSLog(@"捕获区域改变..."); }
/** * 会话出错 * * @param notification 通知对象 */ -(void)sessionRuntimeError:(NSNotification *)notification{ NSLog(@"会话发生错误."); }
#pragma mark - 私有方法 /** * 取得指定位置的摄像头 * * @param position 摄像头位置 * * @return 摄像头设备 */ -(AVCaptureDevice *)getCameraDeviceWithPosition:(AVCaptureDevicePosition )position{ NSArray *cameras= [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]; for (AVCaptureDevice *camera in cameras) { if ([camera position]==position) { return camera; } } return nil; }
/** * 改变设备属性的统一操作方法 * * @param propertyChange 属性改变操作 */ -(void)changeDeviceProperty:(PropertyChangeBlock)propertyChange{ AVCaptureDevice *captureDevice= [self.captureDeviceInput device]; NSError *error; //注意改变设备属性前一定要首先调用lockForConfiguration:调用完之后使用unlockForConfiguration方法解锁 if ([captureDevice lockForConfiguration:&error]) { propertyChange(captureDevice); [captureDevice unlockForConfiguration]; }else{ NSLog(@"设置设备属性过程发生错误,错误信息:%@",error.localizedDescription); } }
/** * 设置闪光灯模式 * * @param flashMode 闪光灯模式 */ -(void)setFlashMode:(AVCaptureFlashMode )flashMode{ [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) { if ([captureDevice isFlashModeSupported:flashMode]) { [captureDevice setFlashMode:flashMode]; } }]; }
/** * 设置聚焦模式 * * @param focusMode 聚焦模式 */ -(void)setFocusMode:(AVCaptureFocusMode )focusMode{ [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) { if ([captureDevice isFocusModeSupported:focusMode]) { [captureDevice setFocusMode:focusMode]; } }]; }
/** * 设置曝光模式 * * @param exposureMode 曝光模式 */ -(void)setExposureMode:(AVCaptureExposureMode)exposureMode{ [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) { if ([captureDevice isExposureModeSupported:exposureMode]) { [captureDevice setExposureMode:exposureMode]; } }]; }
/** * 设置聚焦点 * * @param point 聚焦点 */ -(void)focusWithMode:(AVCaptureFocusMode)focusMode exposureMode:(AVCaptureExposureMode)exposureMode atPoint:(CGPoint)point{ [self changeDeviceProperty:^(AVCaptureDevice *captureDevice) { if ([captureDevice isFocusModeSupported:focusMode]) { [captureDevice setFocusMode:AVCaptureFocusModeAutoFocus]; } if ([captureDevice isFocusPointOfInterestSupported]) { [captureDevice setFocusPointOfInterest:point]; } if ([captureDevice isExposureModeSupported:exposureMode]) { [captureDevice setExposureMode:AVCaptureExposureModeAutoExpose]; } if ([captureDevice isExposurePointOfInterestSupported]) { [captureDevice setExposurePointOfInterest:point]; } }]; }
/** * 添加点按手势,点按时聚焦 */ -(void)addGenstureRecognizer{ UITapGestureRecognizer *tapGesture=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapScreen:)]; [self.viewContainer addGestureRecognizer:tapGesture]; } -(void)tapScreen:(UITapGestureRecognizer *)tapGesture{ CGPoint point= [tapGesture locationInView:self.viewContainer]; //将UI坐标转化为摄像头坐标 CGPoint cameraPoint= [self.captureVideoPreviewLayer captureDevicePointOfInterestForPoint:point]; [self setFocusCursorWithPoint:point]; [self focusWithMode:AVCaptureFocusModeAutoFocus exposureMode:AVCaptureExposureModeAutoExpose atPoint:cameraPoint]; }
/** * 设置闪光灯按钮状态 */ -(void)setFlashModeButtonStatus{ AVCaptureDevice *captureDevice=[self.captureDeviceInput device]; AVCaptureFlashMode flashMode=captureDevice.flashMode; if([captureDevice isFlashAvailable]){ self.flashAutoButton.hidden=NO; self.flashOnButton.hidden=NO; self.flashOffButton.hidden=NO; self.flashAutoButton.enabled=YES; self.flashOnButton.enabled=YES; self.flashOffButton.enabled=YES; switch (flashMode) { case AVCaptureFlashModeAuto: self.flashAutoButton.enabled=NO; break; case AVCaptureFlashModeOn: self.flashOnButton.enabled=NO; break; case AVCaptureFlashModeOff: self.flashOffButton.enabled=NO; break; default: break; } }else{ self.flashAutoButton.hidden=YES; self.flashOnButton.hidden=YES; self.flashOffButton.hidden=YES; } }
/** * 设置聚焦光标位置 * * @param point 光标位置 */ -(void)setFocusCursorWithPoint:(CGPoint)point{ self.focusCursor.center=point; self.focusCursor.transform=CGAffineTransformMakeScale(1.5, 1.5); self.focusCursor.alpha=1.0; [UIView animateWithDuration:1.0 animations:^{ self.focusCursor.transform=CGAffineTransformIdentity; } completion:^(BOOL finished) { self.focusCursor.alpha=0; }];
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