//  Created by David_Tian on 14-9-24.//  Copyright (c) 2014年 All rights reserved.//  未做适配,有兴趣的童鞋可以扩展#import "cameraViewController.h"#import <AVFoundation/AVFoundation.h>#import <ImageIO/ImageIO.h>#import <QuartzCore/QuartzCore.h>typedef enum{    isFrontCamera = 0,    isBackCamera} cameraType;typedef enum{    AutoFlash = 0,    CloseFlash,    OpenFlash} flashModel;@interface cameraViewController ()< AVCaptureAudioDataOutputSampleBufferDelegate, UIImagePickerControllerDelegate >{    UIImage *_photo;    BOOL _isFontCamera;}@property (strong, nonatomic) AVCaptureSession           *session;       // 捕获会话@property (nonatomic, strong) AVCaptureStillImageOutput  *captureOutput; // 输出设备@property (nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer;  // 取景器 @end@implementation cameraViewController- (AVCaptureSession *)session{    if (_session == nil) {        _session = [[AVCaptureSession alloc] init];    }    return _session;}- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor grayColor];
    UIButton *btnCam = [[UIButton alloc]initWithFrame:CGRectMake(20, 44, 80, 30)];    [btnCam setTitle:@"拍照" forState:UIControlStateNormal];    [btnCam setTitle:@"重照" forState:UIControlStateSelected];//重拍没做    [btnCam setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];    [btnCam addTarget:self action:@selector(capture) forControlEvents:UIControlEventTouchUpInside];    [btnCam setBackgroundColor:[UIColor whiteColor]];    [self.view addSubview:btnCam];    UIButton *btnSelectCam = [[UIButton alloc]initWithFrame:CGRectMake(110, 44, 80, 30)];    [btnSelectCam setTitle:@"后置相机" forState:UIControlStateNormal];    [btnSelectCam setTitle:@"前置相机" forState:UIControlStateSelected];    [btnSelectCam setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];    [btnSelectCam addTarget:self action:@selector(switchCamera:) forControlEvents:UIControlEventTouchUpInside];    [btnSelectCam setBackgroundColor:[UIColor whiteColor]];    [self.view addSubview:btnSelectCam];      UIButton *btnFlash = [[UIButton alloc]initWithFrame:CGRectMake(200, 44, 80, 30)];    [btnFlash setTitle:@"闪光灯" forState:UIControlStateNormal];    [btnFlash setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];    [btnFlash addTarget:self action:@selector(switchFlashMode:) forControlEvents:UIControlEventTouchUpInside];    [btnFlash setBackgroundColor:[UIColor whiteColor]];    [self.view addSubview:btnFlash];    [self switchCamera:nil];}
#pragma mark - action// 拍照- (void)capture{    if (![self.session isRunning]) {        [self getPhoto];    }else{        [_session stopRunning];    }}// 切换摄像头- (void)switchCamera:(UIButton *)sender{    [self.session stopRunning];    [_previewLayer removeFromSuperlayer];    sender.selected = !sender.selected;    _isFontCamera = !_isFontCamera;    [self setupCamera];}// 获取图片- (void)getPhoto{    AVCaptureConnection *videoConnection = nil;    for (AVCaptureConnection *connection in _captureOutput.connections) {        for (AVCaptureInputPort *port in [connection inputPorts]) {            if ([[port mediaType] isEqual:AVMediaTypeVideo] ) {                videoConnection = connection;                break;            }        }        if (videoConnection) {            break;        }    }    [_captureOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler:^(CMSampleBufferRef imageSampleBuffer, NSError *error)    {        CFDictionaryRef exifAttachments = CMGetAttachment(imageSampleBuffer, kCGImagePropertyExifDictionary, nil);        if (exifAttachments) {            // Do something with the attachments.        }        // 获取图片数据        NSData *imageData =http://www.mamicode.com/ [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageSampleBuffer];        UIImage *t_image = [[UIImage alloc] initWithData:imageData];        _photo = [[UIImage alloc]initWithCGImage:t_image.CGImage scale:1.5 orientation:UIImageOrientationRight];        UIImageView *imageView = [[UIImageView alloc]initWithFrame:_previewLayer.frame];        [_previewLayer removeFromSuperlayer];        imageView.image = _photo;        imageView.contentMode = UIViewContentModeScaleAspectFill;        imageView.clipsToBounds = YES;        [self.view addSubview:imageView];    }];} // 切换闪光灯模式- (void)switchFlashMode:(UIButton*)sender {        Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");    if (!captureDeviceClass) {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示信息" message:@"您的设备没有拍照功能" delegate:nil cancelButtonTitle:NSLocalizedString(@"Sure", nil) otherButtonTitles: nil];        [alert show];        return;    }      NSString *imgName = @"";    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    [device lockForConfiguration:nil];    if ([device hasFlash]) {        if (device.flashMode == AVCaptureFlashModeOff) {            device.flashMode = AVCaptureFlashModeOn;            imgName = @"";                    } else if (device.flashMode == AVCaptureFlashModeOn) {            device.flashMode = AVCaptureFlashModeAuto;            imgName = @"";        } else if (device.flashMode == AVCaptureFlashModeAuto) {            device.flashMode = AVCaptureFlashModeOff;            imgName = @"";        }        if (sender) {            [sender setImage:[UIImage imageNamed:imgName] forState:UIControlStateNormal];        }    } else {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示信息" message:@"您的设备没有闪光灯功能" delegate:nil cancelButtonTitle:@"ok" otherButtonTitles: nil];        [alert show];    }    [device unlockForConfiguration];} // 初始化相机- (void)setupCamera{    AVCaptureDevice *captureDevice = [self getVideoInputCamera:(_isFontCamera ? isFrontCamera : isBackCamera)];    AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:nil];    if ([self.session canAddInput:deviceInput]){        [_session addInput:deviceInput];    }    // 预览视图(取景器)    _previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];    [_previewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];        CALayer *preLayer = [[self view] layer];    [preLayer setMasksToBounds:YES];    [_previewLayer setFrame:CGRectMake(10, 100, 300, 300)];    [preLayer insertSublayer:_previewLayer atIndex:0];    [_session startRunning];        // 创建一个输出设备,并将它添加到会话    _captureOutput = [[AVCaptureStillImageOutput alloc] init];    NSDictionary *outputSettings = [[NSDictionary alloc] initWithObjectsAndKeys:AVVideoCodecJPEG,AVVideoCodecKey,nil];    _captureOutput.outputSettings = outputSettings;    [_session addOutput:_captureOutput];} #pragma mark VideoCapture- (AVCaptureDevice *)getVideoInputCamera:(cameraType )cameraType{    //获取(后置/前置)摄像头设备    NSArray *cameras = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];    for (AVCaptureDevice *device in cameras){        switch (cameraType) {            case isFrontCamera:                if (device.position == AVCaptureDevicePositionFront)                    return device;                break;            case isBackCamera:                if (device.position == AVCaptureDevicePositionBack)                    return device;                break;            default:                break;        }    }    return [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];} @end