IOS 扫描功能

前言：一个简单扫描功能集成。

大致步骤：

1、检查是否有无权限访问相机；

2、如果有，初始化相机、扫描器

2.1、获取摄像设备；

2.2、创建输入流；

2.3、创建输出流；

2.4、设置代理，在主线程刷新；

2.5、设置敏感区域；

2.6、初始化连接对象；

2.7、高质量采集率；

2.8、设置条形码类型；

2.9、更新页面

代码如下：

#import "IWScanViewController.h"#import "IWScanMaskView.h"#import <AVFoundation/AVFoundation.h>//扫描线的static const CGFloat KLineX = 20;static const CGFloat KLineY = 20;static const CGFloat KLineH = 2;@interface IWScanViewController ()<AVCaptureMetadataOutputObjectsDelegate>{    AVCaptureDevice             *_device;    AVCaptureInput              *_input;    AVCaptureMetadataOutput     *_output;    AVCaptureSession            *_session;    AVCaptureVideoPreviewLayer  *_preview;    NSTimer                     *_timer;    UIImageView                 *_line;    BOOL                        _upOrdown;    int                         _num;}@end@implementation IWScanViewController- (void)viewWillAppear:(BOOL)animated{    [super viewWillAppear:animated];    if (_session && ![_session isRunning]) {        [_session startRunning];        _timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation) userInfo:nil repeats:YES];    }}- (void)viewWillDisappear:(BOOL)animated{    [super viewWillDisappear:animated];    [_timer invalidate];    _timer = nil;}- (void)viewDidLoad {    [super viewDidLoad];        //1.设置标题    self.title = @"扫一扫";        //2.检验是否有无权限访问相机    [self checkAVAuthorizationStatus];}#pragma mark 检验是否有无权限访问相机- (void)checkAVAuthorizationStatus{    AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];    if (status == AVAuthorizationStatusAuthorized || status == AVAuthorizationStatusNotDetermined) {        [self setupCamera];    }else{        [SVProgressHUD showErrorWithStatus:@"您没有权限访问相机"];    }}#pragma mark 初始化相机，扫描器- (void)setupCamera{    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{                //获取摄像设备        _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];        //创建输入流        _input = [[AVCaptureDeviceInput alloc] initWithDevice:_device error:nil];        //创建输出流        _output = [[AVCaptureMetadataOutput alloc] init];        //设置代理，在主线程里刷新        [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];                //设置敏感区域        CGFloat outputH = KScreenHeight;        CGFloat outputW = KScreenWidth;        [_output setRectOfInterest:CGRectMake((outputH - KScanHeight)/2/outputH, KScanX/outputW, KScanHeight/outputH, (outputW - 2*KScanX)/outputW)];        //初始化连接对象        _session = [[AVCaptureSession alloc] init];        //高质量采集率        [_session setSessionPreset:AVCaptureSessionPresetHigh];                if ([_session canAddInput:_input]) {            [_session addInput:_input];        }                if ([_session canAddOutput:_output]) {            [_session addOutput:_output];        }                //条形码类型        if ([_output.availableMetadataObjectTypes containsObject:AVMetadataObjectTypeQRCode]) {            _output.metadataObjectTypes =  [NSArray arrayWithObjects:AVMetadataObjectTypeCode128Code,AVMetadataObjectTypeUPCECode,AVMetadataObjectTypeCode39Code,AVMetadataObjectTypeCode39Mod43Code,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeCode93Code,AVMetadataObjectTypePDF417Code,AVMetadataObjectTypeQRCode,AVMetadataObjectTypeAztecCode,AVMetadataObjectTypeInterleaved2of5Code,AVMetadataObjectTypeITF14Code,AVMetadataObjectTypeDataMatrixCode,nil];        }                dispatch_async(dispatch_get_main_queue(), ^{                        //更新界面            _preview = [AVCaptureVideoPreviewLayer layerWithSession:_session];            _preview.videoGravity = AVLayerVideoGravityResizeAspectFill;            _preview.frame = self.view.layer.bounds;            [self.view.layer insertSublayer:_preview atIndex:0];            [_session startRunning];            [self lineAnimation];        });            });}#pragma mark 添加条形线- (void)lineAnimation{    IWScanMaskView *scanMaskView = [[IWScanMaskView alloc] initWithFrame:_preview.frame];    [self.view addSubview:scanMaskView];        UIImageView * image = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"home_scan_frame"]];    image.frame = CGRectMake(KScanX, (KScreenHeight - KScanHeight)/2, KScreenWidth - 2*KScanX, KScanHeight);    [self.view addSubview:image];        UILabel *pointOutLable = [[UILabel alloc] init];    CGFloat pointOutLableH = 20;    CGFloat pointOutLableY = CGRectGetMaxY(image.frame) + pointOutLableH;    pointOutLable.frame = CGRectMake(0, pointOutLableY, KScreenWidth, pointOutLableH);    pointOutLable.font = [UIFont systemFontOfSize:13.0f];    pointOutLable.textAlignment = NSTextAlignmentCenter;    pointOutLable.textColor = [UIColor whiteColor];    pointOutLable.text = @"将二维码放入框内，即可自动扫描";    [self.view addSubview:pointOutLable];        CGFloat lineW = image.frame.size.width - 2*KLineX;    _line = [[UIImageView alloc] initWithFrame:CGRectMake(KLineX, KLineY, lineW, KLineH)];    _line.image = [UIImage imageNamed:@"home_scan_line"];    [image addSubview:_line];    //定时器    _timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation) userInfo:nil repeats:YES];}-(void)animation{    if (_upOrdown == NO) {        _num ++;        _line.frame = (CGRect){{KLineX, KLineY + KLineH*_num},_line.frame.size};        if (KLineH*_num == (KScanHeight - 2*KLineY)) {            _upOrdown = YES;        }    }    else {        _num --;        _line.frame = (CGRect){{KLineX, KLineY + KLineH*_num},_line.frame.size};        if (_num == 0) {            _upOrdown = NO;        }    }}#pragma mark - 扫描结果处理- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{    NSString *stringValue;    if ([metadataObjects count] > 0) {        AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects objectAtIndex:0];        if ([metadataObject isKindOfClass:[AVMetadataMachineReadableCodeObject class]]) {            stringValue = [metadataObject stringValue];        }    }        [_session stopRunning];    [_timer setFireDate:[NSDate distantFuture]];    NSLog(@"stringValue is %@",stringValue);    //打开内容需要在此处进行处理    }@end

扫描遮罩代码

#import <UIKit/UIKit.h>extern const CGFloat KScanHeight;extern const CGFloat KScanX;@interface IWScanMaskView : UIView@end

#import "IWScanMaskView.h"const CGFloat KScanHeight = 280;const CGFloat KScanX = 20;@implementation IWScanMaskView- (instancetype)initWithFrame:(CGRect)frame {    self = [super initWithFrame:frame];    if (self) {        self.backgroundColor = [UIColor clearColor];    }    return self;}- (void)drawRect:(CGRect)rect{    self.backgroundColor = [UIColor clearColor];        CGFloat width = self.bounds.size.width;    CGFloat height = self.bounds.size.height;        CGContextRef ctx = UIGraphicsGetCurrentContext();    CGRect screenDrawRect = self.bounds;    CGRect clearDrawRect = CGRectMake(KScanX, (height - KScanHeight)/2, width - 2*KScanX, KScanHeight);        CGContextSetRGBFillColor(ctx, 0 / 255.0,0 / 255.0,0 / 255.0,0.5);    CGContextFillRect(ctx, screenDrawRect);        CGContextClearRect(ctx, clearDrawRect);}@end