扫描AVCapture -- 完整版(指定区域+闪光灯)

来源：互联网发布：文档网络在哪里编辑：程序博客网时间：2024/05/29 18:54

以前扫描功能自己也写过, 也使用过第三方, 但是好久没使用几乎都快忘完了, 所以乘着自己还年轻赶紧凭着印象, 结合着资料记录下来
关于AVCapture相关属性的一些详细的说明请参考我另外一篇博客http://blog.csdn.net/zhz459880251/article/details/49307819

声明

扫描器部分ZHZCaptureViewController.h

#import <UIKit/UIKit.h>//传值的作用typedef void(^MyBlock)(NSString *); @interface ZHZCaptureViewController : UIViewController@property (nonatomic, copy) MyBlock myBlock;//方便传值- (void)showBlock:(MyBlock)block;@end

实现

这个部分是比较麻烦的, 有查询了一些参数
—参数都进行了整理和备注, 这里就不啰嗦了

#import "ZHZCaptureViewController.h"#import <AVFoundation/AVFoundation.h>//这个类 是为了实现中间透明外周半透明效果的#import "QRView.h"#define kScreenW [UIScreen mainScreen].bounds.size.width#define kScreenH [UIScreen mainScreen].bounds.size.height@interface ZHZCaptureViewController ()<AVCaptureMetadataOutputObjectsDelegate>{    QRView *scanView;}@property (nonatomic, copy) NSString *stringValue;///设备的抽象化@property (strong, nonatomic)AVCaptureDevice *device;///输入设备,它配置抽象硬件设备的ports。AVCaptureInput的子类@property (strong, nonatomic)AVCaptureDeviceInput *input;///它代表输出数据，管理着输出到一个movie或者图像。AVCaptureOutput的子类@property (strong, nonatomic)AVCaptureMetadataOutput *output;///它是input和output的桥梁。它协调着intput到output的数据传输。@property (strong, nonatomic)AVCaptureSession *session;///预览 显示layer层@property (strong, nonatomic)AVCaptureVideoPreviewLayer *preView;@end@implementation ZHZCaptureViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor whiteColor];    //填充 半透明效果的view    scanView = [[QRView alloc] initWithFrame:[UIScreen mainScreen].bounds];    scanView.backgroundColor = [UIColor clearColor];    //中间透明区域    scanView.transparentArea = CGSizeMake(kScreenW - 20, kScreenW - 80);    [self.view addSubview:scanView];    [scanView startMove];    //创建 扫描器    [self setUpAboutCapture];    //开始扫描    [self.session startRunning];    //判断是否有 相机权限(这里暂时没做实际的操作)    [self checkAVAuthorizationStatus];}//判断是否有 相机权限- (void)checkAVAuthorizationStatus {    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];    //NSString *tips = NSLocalizedString(@"AVAuthorization", @"您没有权限访问相机");    //tips = [[NSBundle mainBundle] localizedStringForKey:@"AVAuthorization" value:@"" table:nil];    NSLog(@"%ld", (long)status);    /**     *  AVAuthorizationStatusNotDetermined = 0, 用户尚未做出了选择这个应用程序的问候     *  AVAuthorizationStatusRestricted,        此应用程序没有被授权访问的照片数据。可能是家长控制权限     *  AVAuthorizationStatusDenied, 用户已经明确否认了这一照片数据的应用程序访问.     *  AVAuthorizationStatusAuthorized, 用户已授权应用访问照片数据     */    switch (status) {        case AVAuthorizationStatusNotDetermined:            //do somethings            NSLog(@"用户尚未做出了选择这个应用程序的问候");            break;        case AVAuthorizationStatusRestricted:            //do somethings            NSLog(@"此应用程序没有被授权访问的照片数据。可能是家长控制权限");            break;        case AVAuthorizationStatusDenied:            //do somethings            NSLog(@"用户已经明确否认了这一照片数据的应用程序访问");            break;        case AVAuthorizationStatusAuthorized:            //do somethings            NSLog(@"用户已授权应用访问照片数据");            break;        default:            break;    }//    if(status == AVAuthorizationStatusAuthorized) {        // 有相机权限//        ////    //    } else {            //没相机权限, 提示//        //[SVProgressHUD showWithStatus:tips];//        NSLog(@"----%@", tips);//    }}//创建对象- (void)setUpAboutCapture {    /*     AVMediaTypeVideo,     AVMediaTypeAudio,      AVMediaTypeMuxed     */    self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    self.input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];    self.output = [[AVCaptureMetadataOutput alloc] init];    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];    //设置扫描范围    //[self setRectOfScan];    self.session = [[AVCaptureSession alloc] init];    /**     *  AVCaptureSessionPresetPhoto     *  AVCaptureSessionPresetHigh     *  AVCaptureSessionPresetMedium     *  AVCaptureSessionPresetLow     *  AVCaptureSessionPreset352x288     *  AVCaptureSessionPreset640x480     *  AVCaptureSessionPreset960x540     *  AVCaptureSessionPreset1280x720     *  AVCaptureSessionPreset1920x1080     *  AVCaptureSessionPreset3840x2160     *  AVCaptureSessionPresetiFrame960x540     *  AVCaptureSessionPresetiFrame1280x720     *  AVCaptureSessionPresetInputPriority     */    [self.session setSessionPreset:AVCaptureSessionPresetHigh];    if ([self.session canAddInput:self.input]) {        [self.session addInput:self.input];    }else {        NSLog(@"输入失败");    }    if ([self.session canAddOutput:self.output]) {        [self.session addOutput:self.output];    }else {        NSLog(@"输出失败");    }    //设置属性    //条码类型    /* 上面都是7.0以上     AVMetadataObjectTypeUPCECode     AVMetadataObjectTypeCode39Code     AVMetadataObjectTypeCode39Mod43Code     AVMetadataObjectTypeEAN13Code              条形码     AVMetadataObjectTypeEAN8Code     AVMetadataObjectTypeCode93Code     AVMetadataObjectTypeCode128Code     AVMetadataObjectTypePDF417Code     AVMetadataObjectTypeQRCode                 二维码     AVMetadataObjectTypeAztecCode     AVMetadataObjectTypeInterleaved2of5Code    NS_AVAILABLE(NA, 8_0);     AVMetadataObjectTypeITF14Code              NS_AVAILABLE(NA, 8_0);     AVMetadataObjectTypeDataMatrixCode         NS_AVAILABLE(NA, 8_0);     */    self.output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode, AVMetadataObjectTypeEAN13Code];    self.preView = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];    /*     AVLayerVideoGravityResize,     AVLayerVideoGravityResizeAspect, 默认     AVLayerVideoGravityResizeAspectFill     */    self.preView.videoGravity = AVLayerVideoGravityResizeAspectFill;    self.preView.frame = [UIScreen mainScreen].bounds;    [self.view.layer insertSublayer:self.preView atIndex:0];}#pragma mark - AVCaptureMetadataOutputObjectsDelegate- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {    if ([metadataObjects count] > 0) {        //停止扫描        [self.session stopRunning];        [scanView stopMove];        AVMetadataMachineReadableCodeObject *metadataObjet = metadataObjects[0];        self.stringValue = metadataObjet.stringValue;        //self.myBlock(self.stringValue);        [self dismissViewControllerAnimated:YES completion:^{            self.myBlock(self.stringValue);        }];        NSLog(@"扫描后数据---%@", self.stringValue);    }}//传递参数- (void)showBlock:(MyBlock)block {    self.myBlock = block;}@end

调用

这就很简单了, 只要把扫描器推出来就行

#import "ViewController.h"#import "ZHZCaptureViewController.h"@interface ViewController ()///显示 扫描后返回的数据@property (weak, nonatomic) IBOutlet UILabel *detailLabel;///跳转到扫描页面- (IBAction)capture:(id)sender;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];}/** *  跳转到 扫描页 */- (IBAction)capture:(id)sender {    ZHZCaptureViewController *capture = [[ZHZCaptureViewController alloc] init];     __weak typeof(self) weakSelf = self;    [capture showBlock:^(NSString *string) {        if (string) {            weakSelf.detailLabel.text = string;        }        NSLog(@"%@", string);    }];    capture.modalTransitionStyle = UIModalTransitionStylePartialCurl;    [self presentViewController:capture animated:YES completion:nil];}@end

进阶一(指定扫描区域)

  //设置扫描范围  [self setRectOfScan];

/** *  设置扫描范围 */- (void)setRectOfScan {    CGRect cropRect = CGRectMake((kScreenW - scanView.transparentArea.width) / 2,                                 (kScreenH - scanView.transparentArea.height) / 2,                                 scanView.transparentArea.width,                                 scanView.transparentArea.height);    /*注意参数, x与y, 宽和高相互对调*/    [_output setRectOfInterest:CGRectMake(cropRect.origin.y / kScreenH,                                          cropRect.origin.x / kScreenW,                                          cropRect.size.height / kScreenH,                                          cropRect.size.width / kScreenW)];}

进阶二(闪光灯)

//添加闪关灯按钮    if (![self.device hasTorch]) {        NSLog(@"没有闪光灯功能");    }else {        [self setUpWidget];    }

/** *  闪光灯控制*/- (void)setUpWidget {    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];    button.frame = CGRectMake(100, 40, 100, 40);    [button setBackgroundColor:[UIColor blueColor]];    [button setTitle:@"闪关灯" forState:UIControlStateNormal];    [button addTarget:self action:@selector(flashlight) forControlEvents:UIControlEventTouchUpInside];    [scanView addSubview:button];}/** *  打开 或者 关闭闪关灯(home自动关闭闪光灯, 所以不用再做判断) */- (void)flashlight {        //如果闪光灯正在使用 则关闭        if (self.device.torchMode == AVCaptureTorchModeOn) {            [self.device lockForConfiguration:nil];            [self.device setTorchMode:AVCaptureTorchModeOff];            [self.device unlockForConfiguration];        }else if (self.device.torchMode == AVCaptureTorchModeOff){            //锁定闪光灯            [self.device lockForConfiguration:nil];            //打开闪光灯            /**             AVCaptureTorchModeOff  = 0,             AVCaptureTorchModeOn   = 1,             AVCaptureTorchModeAuto             */            [self.device setTorchMode:AVCaptureTorchModeOn];            //解除锁定            [self.device unlockForConfiguration];        }}

进阶三(中间区域透明)

#import <UIKit/UIKit.h>@interface QRView : UIView/** *  透明的区域 size */@property (nonatomic, assign) CGSize transparentArea;//开始 移动- (void)startMove;//停止 移动- (void)stopMove;@end

#import "QRView.h"#define kQrLineanimateDuration 0.01#define kScreenW [UIScreen mainScreen].bounds.size.width#define kScreenH [UIScreen mainScreen].bounds.size.height@interface QRView (){    NSTimer *timer;}@property (nonatomic, assign) NSInteger qrLineY;@property (nonatomic, strong) UIImageView *qrLine;@end@implementation QRView- (instancetype)initWithFrame:(CGRect)frame {    self = [super initWithFrame:frame];    if (self) {    }    return self;}- (void)initQRLine {    //添加 扫描滚动的线条    self.qrLine  = [[UIImageView alloc] initWithFrame:CGRectMake(kScreenW / 2 - self.transparentArea.width / 2, kScreenH / 2 - self.transparentArea.height / 2, self.transparentArea.width, 2)];    self.qrLine.image = [UIImage imageNamed:@"qr_scan_line"];    self.qrLine.contentMode = UIViewContentModeScaleAspectFill;    [self addSubview:self.qrLine];    self.qrLineY = self.qrLine.frame.origin.y;    self.qrLine.backgroundColor = [UIColor redColor];    //显示 下方的提示    CGFloat labelX = 20;    CGFloat labelY = self.transparentArea.height / 2 + kScreenH / 2 + 20;    UILabel *showLabel = [[UILabel alloc] initWithFrame:CGRectMake(labelX, labelY, kScreenW - 20*2, 30)];    showLabel.text = @"请将条形码 或 二维码放到扫描框中";    showLabel.textColor = [UIColor blueColor];    showLabel.textAlignment = NSTextAlignmentCenter;    [self addSubview:showLabel];}//显示 扫描线 移动- (void)show {    [UIView animateWithDuration:kQrLineanimateDuration animations:^{        CGRect rect = self.qrLine.frame;        rect.origin.y = self.qrLineY;        self.qrLine.frame = rect;    } completion:^(BOOL finished) {        CGFloat maxBorder = kScreenH / 2 + self.transparentArea.height / 2 - 4;        if (self.qrLineY > maxBorder) {            self.qrLineY = kScreenH / 2 - self.transparentArea.height /2;        }        self.qrLineY++;    }];}- (void)drawRect:(CGRect)rect {    //整个二维码扫描界面的颜色    CGSize screenSize =self.bounds.size;    CGRect screenDrawRect =CGRectMake(0, 0, screenSize.width, screenSize.height);    //中间清空的矩形框    CGRect clearDrawRect = CGRectMake(screenDrawRect.size.width / 2 - self.transparentArea.width / 2,                                      screenDrawRect.size.height / 2 - self.transparentArea.height / 2,                                      self.transparentArea.width,self.transparentArea.height);    //获取图形上下文    CGContextRef ctx = UIGraphicsGetCurrentContext();    //画 屏幕矩形框    [self addScreenFillRect:ctx rect:screenDrawRect];    //画 中间透明框    [self addCenterClearRect:ctx rect:clearDrawRect];    [self addWhiteRect:ctx rect:clearDrawRect];    [self addCornerLineWithContext:ctx rect:clearDrawRect];}- (void)addScreenFillRect:(CGContextRef)ctx rect:(CGRect)rect {    CGContextSetRGBFillColor(ctx, 40 / 255.0,40 / 255.0,40 / 255.0,0.5);    CGContextFillRect(ctx, rect);   //draw the transparent layer}- (void)addCenterClearRect :(CGContextRef)ctx rect:(CGRect)rect {    CGContextClearRect(ctx, rect);  //clear the center rect  of the layer}- (void)addWhiteRect:(CGContextRef)ctx rect:(CGRect)rect {    CGContextStrokeRect(ctx, rect);    CGContextSetRGBStrokeColor(ctx, 1, 1, 1, 1);    CGContextSetLineWidth(ctx, 0.8);    CGContextAddRect(ctx, rect);    CGContextStrokePath(ctx);}- (void)addCornerLineWithContext:(CGContextRef)ctx rect:(CGRect)rect{    //画四个边角    CGContextSetLineWidth(ctx, 2);    CGContextSetRGBStrokeColor(ctx, 83 /255.0, 239/255.0, 111/255.0, 1);//绿色    //左上角    CGPoint poinsTopLeftA[] = {        CGPointMake(rect.origin.x+0.7, rect.origin.y),        CGPointMake(rect.origin.x+0.7 , rect.origin.y + 15)    };    CGPoint poinsTopLeftB[] = {CGPointMake(rect.origin.x, rect.origin.y +0.7),CGPointMake(rect.origin.x + 15, rect.origin.y+0.7)};    [self addLine:poinsTopLeftA pointB:poinsTopLeftB ctx:ctx];    //左下角    CGPoint poinsBottomLeftA[] = {CGPointMake(rect.origin.x+ 0.7, rect.origin.y + rect.size.height - 15),CGPointMake(rect.origin.x +0.7,rect.origin.y + rect.size.height)};    CGPoint poinsBottomLeftB[] = {CGPointMake(rect.origin.x , rect.origin.y + rect.size.height - 0.7) ,CGPointMake(rect.origin.x+0.7 +15, rect.origin.y + rect.size.height - 0.7)};    [self addLine:poinsBottomLeftA pointB:poinsBottomLeftB ctx:ctx];    //右上角    CGPoint poinsTopRightA[] = {CGPointMake(rect.origin.x+ rect.size.width - 15, rect.origin.y+0.7),CGPointMake(rect.origin.x + rect.size.width,rect.origin.y +0.7 )};    CGPoint poinsTopRightB[] = {CGPointMake(rect.origin.x+ rect.size.width-0.7, rect.origin.y),CGPointMake(rect.origin.x + rect.size.width-0.7,rect.origin.y + 15 +0.7 )};    [self addLine:poinsTopRightA pointB:poinsTopRightB ctx:ctx];    CGPoint poinsBottomRightA[] = {CGPointMake(rect.origin.x+ rect.size.width -0.7 , rect.origin.y+rect.size.height+ -15),CGPointMake(rect.origin.x-0.7 + rect.size.width,rect.origin.y +rect.size.height )};    CGPoint poinsBottomRightB[] = {CGPointMake(rect.origin.x+ rect.size.width - 15 , rect.origin.y + rect.size.height-0.7),CGPointMake(rect.origin.x + rect.size.width,rect.origin.y + rect.size.height - 0.7 )};    [self addLine:poinsBottomRightA pointB:poinsBottomRightB ctx:ctx];    CGContextStrokePath(ctx);}- (void)addLine:(CGPoint[])pointA pointB:(CGPoint[])pointB ctx:(CGContextRef)ctx {    CGContextAddLines(ctx, pointA, 2);    CGContextAddLines(ctx, pointB, 2);}#pragma mark -moveLine- (void)startMove {    //首先 调用这个方法时 判断扫描线是否存在, 不存在就加载    if (!self.qrLine) {        [self initQRLine];    }    //判断定时器是否存在, 不存在就创建    if (!timer) {        timer = [NSTimer scheduledTimerWithTimeInterval:kQrLineanimateDuration target:self selector:@selector(show) userInfo:nil repeats:YES];    }}- (void)stopMove {    //定时器存在是 设置其无效    if (timer) {        [timer invalidate];    }}@end

截图

注意事项

说多了都是泪, 满满的全是算计啊
话说还是吃一堑长一智的
1. 开始写习惯了, 直接解释alloc init, 运行的好几次都是黑屏, 后来检查才发现还要设置这个layer 和 session的关系
self.preView = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
2. 闪光灯打开或者关闭是都要先锁定再设置设置属性后解锁

[self.device lockForConfiguration:nil];            [self.device setTorchMode:AVCaptureTorchModeOff];            [self.device unlockForConfiguration];

不然 , 嘿嘿…..
3. AVCaptureMetadataOutput设置时也要注意, 设置metadataObjectTypes扫描类型之前一定要添加 addOutput:输出设备
if ([_session canAddOutput:output]){ [_session addOutput:output]; } // 条码类型 AVMetadataObjectTypeQRCode output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];

参考

1.原生二维码扫描: http ://blog.csdn.net/lc_obj/article/details/41549469?utm_source=tuicool&utm_medium=referral;
2.仿微信扫描: https ://github.com/lcddhr/QRWeiXinDemo

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