二维码扫描实现

////  ViewController.m//  二维码-全是干货////  Created by WSJ on 15/7/17.//  Copyright © 2015年 WSJ. All rights reserved.///** 二维码实现思路 1. 输入设备(用来获取外界信息)  摄像头, 麦克风, 键盘 2. 输出设备 (将收集到的信息, 做解析, 来获取收到的内容) 3. 会话session (用来连接输入和输出设备) 4. 特殊的layer (展示输入设备所采集的信息) *///主控制器代码实现#import "ViewController.h"#import <AVFoundation/AVFoundation.h>#import "HMPreView.h"@interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>//1. 输入设备(用来获取外界信息)  摄像头, 麦克风, 键盘@property (nonatomic, strong) AVCaptureDeviceInput *input;//2. 输出设备 (将收集到的信息, 做解析, 来获取收到的内容)@property (nonatomic, strong) AVCaptureMetadataOutput *output;//3. 会话session (用来连接输入和输出设备)@property (nonatomic, strong) AVCaptureSession *session;//4. 特殊的layer (展示输入设备所采集的信息)//@property (nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer;@property (nonatomic, strong) HMPreView *preview;@property (weak, nonatomic) IBOutlet UILabel *label;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}#pragma mark 点击屏幕开始扫描- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    //1.输入设备(用来获取外界信息)  摄像头, 麦克风, 键盘    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    self.input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];    //2.输出设备 (将收集到的信息, 做解析, 来获取收到的内容)    self.output = [AVCaptureMetadataOutput new];    //3.会话session (用来连接输入和输出设备)    self.session = [AVCaptureSession new];    // 会话扫描展示的大小    [self.session setSessionPreset:AVCaptureSessionPresetHigh];    // 会话跟输入和输出设备关联    if ([self.session canAddInput:self.input]) {        [self.session addInput:self.input];    }    if ([self.session canAddOutput:self.output]) {         [self.session addOutput:self.output];    }    //下面两句代码应该写在此处    //制定输出设备的代理, 用来接受返回的数据    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];    //设置元数据类型 二维码QRCode    [self.output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];    //4.特殊的layer (展示输入设备所采集的信息)    //self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];    // 大小layer的大小    //self.previewLayer.frame = self.view.bounds;    //[self.view.layer addSublayer:self.previewLayer];    self.preview = [[HMPreView alloc] initWithFrame:self.view.bounds];    self.preview.session = self.session;    [self.view addSubview:self.preview];    //5. 启动会话    [self.session startRunning];}/** captureOutput : 输出设备 metadataObjects : 元数据对象的数组 connection : 连接 */- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{    //1. 停止会话    [self.session stopRunning];    //2. 删除layer    //[self.previewLayer removeFromSuperlayer];    [self.preview removeFromSuperview];    //3. 遍历数据获取内容    for (AVMetadataMachineReadableCodeObject *obj in metadataObjects) {        //NSLog(@"obj: %@",obj.stringValue);        self.label.text = obj.stringValue;    }}@end

//layer层代码实现#import <UIKit/UIKit.h>#import <AVFoundation/AVFoundation.h>@interface HMPreView : UIView@property (nonatomic,strong)AVCaptureSession *session;@end//  HMPreView.m//  二维码扫描////  Created by WSJ on 15/7/17.//  Copyright (c) 2015年 WSJ. All rights reserved.//#import "HMPreView.h"@interface HMPreView ()@property (nonatomic,strong)UIImageView *imageView;@property (nonatomic,strong)UIImageView *lineImageView;@property (nonatomic,strong)NSTimer *timer;@end@implementation HMPreView/** *  layer的类型 * *  @return AVCaptureVideoPreviewLayer 特殊的layer 可以展示输入设备采集到得信息 */+ (Class)layerClass{    return [AVCaptureVideoPreviewLayer class];}- (void)setSession:(AVCaptureSession *)session{    _session = session;    AVCaptureVideoPreviewLayer *layer = (AVCaptureVideoPreviewLayer *)  self.layer;    layer.session = session;}- (instancetype)initWithFrame:(CGRect)frame{    if (self = [super initWithFrame:frame]) {        [self initUiConfig];    }    return self;}- (void)initUiConfig{    //设置背景图片    _imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pick_bg.png"]];    //设置位置到界面的中间    _imageView.frame = CGRectMake(self.bounds.size.width * 0.5 - 140, self.bounds.size.height * 0.5 - 140, 280, 280);    //添加到视图上    [self addSubview:_imageView];    //初始化二维码的扫描线的位置    _lineImageView = [[UIImageView alloc] initWithFrame:CGRectMake(30, 10, 220, 2)];    _lineImageView.image = [UIImage imageNamed:@"line.png"];    [_imageView addSubview:_lineImageView];    //开启定时器    _timer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(animation) userInfo:nil repeats:YES];}- (void)animation{    [UIView animateWithDuration:2.8 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{        _lineImageView.frame = CGRectMake(30, 260, 220, 2);    } completion:^(BOOL finished) {        _lineImageView.frame = CGRectMake(30, 10, 220, 2);    }];}@end

这里就能根据原生代码实现二维码扫描信息了,快来试试吧,当然网络上有很多第三方框架.