.m所有代码 二维码扫描

//
// twoViewController.m
// 项目组合
//

// Created by 与 on 2018/10/20.
// Copyright © 2018 嗯. All rights reserved.
//

#import “twoViewController.h”
#import <AVFoundation/AVFoundation.h>
@interface twoViewController ()
@property (weak, nonatomic) IBOutlet UIView *viewPreview;
@property (weak, nonatomic) IBOutlet UILabel *lblStatus;
@property (weak, nonatomic) IBOutlet UIButton *startBtn;

  • (IBAction)startStopReading:(id)sender;

@property (strong, nonatomic) UIView *boxView;
@property (nonatomic) BOOL isReading;
@property (strong, nonatomic) CALayer *scanLayer;

-(BOOL)startReading;
-(void)stopReading;

//捕捉会话
@property (nonatomic, strong) AVCaptureSession *captureSession;
//展示layer
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *videoPreviewLayer;

@end

@implementation twoViewController

  • (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    _captureSession = nil;
    _isReading = NO;

}

  • (BOOL)startReading {
    NSError *error;

    //1.初始化捕捉设备(AVCaptureDevice),类型为AVMediaTypeVideo
    AVCaptureDevice *captureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    //2.用captureDevice创建输入流
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:captureDevice error:&error];
    if (!input) {
    NSLog(@"%@", [error localizedDescription]);
    return NO;
    }

    //3.创建媒体数据输出流
    AVCaptureMetadataOutput *captureMetadataOutput = [[AVCaptureMetadataOutput alloc] init];

    //4.实例化捕捉会话
    _captureSession = [[AVCaptureSession alloc] init];

    //4.1.将输入流添加到会话
    [_captureSession addInput:input];

    //4.2.将媒体输出流添加到会话中
    [_captureSession addOutput:captureMetadataOutput];

    //5.创建串行队列,并加媒体输出流添加到队列当中
    dispatch_queue_t dispatchQueue;
    dispatchQueue = dispatch_queue_create(“myQueue”, NULL);
    //5.1.设置代理
    [captureMetadataOutput setMetadataObjectsDelegate:self queue:dispatchQueue];

    //5.2.设置输出媒体数据类型为QRCode
    [captureMetadataOutput setMetadataObjectTypes:[NSArray arrayWithObject:AVMetadataObjectTypeQRCode]];

    //6.实例化预览图层
    _videoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:_captureSession];

    //7.设置预览图层填充方式
    [_videoPreviewLayer setVideoGravity:AVLayerVideoGravityResizeAspectFill];

    //8.设置图层的frame
    [_videoPreviewLayer setFrame:_viewPreview.layer.bounds];

    //9.将图层添加到预览view的图层上
    [_viewPreview.layer addSublayer:_videoPreviewLayer];

    //10.设置扫描范围
    captureMetadataOutput.rectOfInterest = CGRectMake(0.2f, 0.2f, 0.8f, 0.8f);

    //10.1.扫描框
    _boxView = [[UIView alloc] initWithFrame:CGRectMake(_viewPreview.bounds.size.width * 0.2f, _viewPreview.bounds.size.height * 0.2f, _viewPreview.bounds.size.width - _viewPreview.bounds.size.width * 0.4f, _viewPreview.bounds.size.height - _viewPreview.bounds.size.height * 0.4f)];
    _boxView.layer.borderColor = [UIColor greenColor].CGColor;
    _boxView.layer.borderWidth = 1.0f;

    [_viewPreview addSubview:_boxView];

    //10.2.扫描线
    _scanLayer = [[CALayer alloc] init];
    _scanLayer.frame = CGRectMake(0, 0, _boxView.bounds.size.width, 1);
    _scanLayer.backgroundColor = [UIColor brownColor].CGColor;

    [_boxView.layer addSublayer:_scanLayer];

    NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.2f target:self selector:@selector(moveScanLayer:) userInfo:nil repeats:YES];

    [timer fire];

    //10.开始扫描
    [_captureSession startRunning];

    return YES;
    }

  • (IBAction)startStopReading:(id)sender {
    if (!_isReading) {
    if ([self startReading]) {
    [_startBtn setTitle:@“Stop” forState:UIControlStateNormal];
    [_lblStatus setText:@“Scanning for QR Code”];
    }
    }
    else{
    [self stopReading];
    [_startBtn setTitle:@“Start!” forState:UIControlStateNormal];
    }

    _isReading = !_isReading;
    }
    -(void)stopReading{
    [_captureSession stopRunning];
    _captureSession = nil;
    [_scanLayer removeFromSuperlayer];
    [_videoPreviewLayer removeFromSuperlayer];
    NSString *str = self.lblStatus.text;
    [[UIApplication sharedApplication]openURL:[NSURL URLWithString:str] options:nil completionHandler:nil];

}

#pragma mark - AVCaptureMetadataOutputObjectsDelegate

  • (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
    {
    //判断是否有数据
    if (metadataObjects != nil && [metadataObjects count] > 0) {
    AVMetadataMachineReadableCodeObject *metadataObj = [metadataObjects objectAtIndex:0];
    //判断回传的数据类型
    if ([[metadataObj type] isEqualToString:AVMetadataObjectTypeQRCode]) {
    [_lblStatus performSelectorOnMainThread:@selector(setText:) withObject:[metadataObj stringValue] waitUntilDone:NO];

          [self performSelectorOnMainThread:@selector(stopReading) withObject:nil waitUntilDone:NO];
          _isReading = NO;
      }
    

    }
    }

  • (void)moveScanLayer:(NSTimer *)timer
    {
    CGRect frame = _scanLayer.frame;
    if (_boxView.frame.size.height < _scanLayer.frame.origin.y) {
    frame.origin.y = 0;
    _scanLayer.frame = frame;
    }else{

      frame.origin.y += 5;
      
      [UIView animateWithDuration:0.1 animations:^{
          _scanLayer.frame = frame;
      }];
    

    }
    }

  • (BOOL)shouldAutorotate
    {
    return NO;
    }

@end

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转载自blog.csdn.net/weixin_43480652/article/details/83244392