iOS二维码扫描

iOS原生二维码扫描

1.导入AVFoundation

代码如下

demo地址： https://github.com/NieYinlong/ScanQRCode.git

效果如下

////  ViewController.m//  ScanQRCode////  Created by YinlongNie on 17/1/3.//  Copyright © 2017年 Jiuzhekan. All rights reserved.//#import "ViewController.h"#import <AVFoundation/AVFoundation.h>#import "UIView+WLFrame.h"#define  kScreenWidth [UIScreen mainScreen].bounds.size.width#define  kScreenHeight [UIScreen mainScreen].bounds.size.height@interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>{    UIImageView *lineImageView;    BOOL upOrDown;    int num;    NSTimer *timer;    CGFloat lineX;    CGFloat lineY;    CGFloat lineWidth;    CGFloat lineAnimationProportion;}@property (strong, nonatomic) AVCaptureDevice *device;@property (strong, nonatomic) AVCaptureDeviceInput *input;@property (strong, nonatomic) AVCaptureMetadataOutput *output;@property (strong, nonatomic) AVCaptureSession *session;@property (strong, nonatomic) AVCaptureVideoPreviewLayer *preView;@end@implementation ViewController- (void)viewWillAppear:(BOOL)animated{    [super viewWillAppear:animated];            self.navigationController.navigationBar.hidden = NO;        [self.session startRunning];    [self openCamera];}- (void)viewDidLoad {    [super viewDidLoad];      [self setNavigationBar];    [self addsubview];}- (void)viewWillDisappear:(BOOL)animated {    [super viewWillDisappear:animated];        [self.session stopRunning];    [timer invalidate];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}- (void)setNavigationBar{    self.view.backgroundColor = [UIColor blackColor];    [self.navigationController.navigationBar setBarStyle:UIBarStyleBlack];// 电池栏白色    //  // 如果设置不透明从导航条底部开始计算frame    self.navigationController.navigationBar.translucent = UIRectEdgeNone;    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"daoHangTiao"] forBarMetrics:(UIBarMetricsDefault)];    self.navigationItem.title = @"二维码扫描";    // 设置返回按钮为白色    [self.navigationController.navigationBar setTintColor:[UIColor whiteColor]];        self.tabBarController.tabBar.hidden = YES;    [self.navigationController setNavigationBarHidden:NO animated:YES];    self.navigationController.navigationBar.hidden = NO;}- (void)addsubview{    UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake((kScreenWidth - kScreenHeight/2)/2, 64+40, kScreenHeight/2, kScreenHeight/2)];    imageView.image = [UIImage imageNamed:@"scan_back_image.png"];    [self.view addSubview:imageView];        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(15, CGRectGetMaxY(imageView.frame)+15, kScreenWidth-30, 50)];;    label.backgroundColor = [UIColor clearColor];    label.numberOfLines = 0;    label.font = [UIFont systemFontOfSize:12];    label.textAlignment = NSTextAlignmentCenter;    label.textColor = [UIColor grayColor];    label.text = @"请将二维码对准扫码框！";    [self.view addSubview:label];        upOrDown = NO;    num = 0;        if (kScreenHeight == 480){        lineX = 60;        lineY = imageView.top + 15;        lineWidth = imageView.width - 50;        lineAnimationProportion = 1.5;    }else if (kScreenHeight == 568){        lineX = 40;        lineY = imageView.top + 15;        lineWidth = imageView.width - 50;        lineAnimationProportion = 1.7;    }else if (kScreenHeight == 667){        lineX = 40;        lineY = imageView.top + 15;        lineWidth = imageView.width - 50;        lineAnimationProportion = 2;    }else{        lineX = 45;        lineY = imageView.top + 15;        lineWidth = imageView.width - 50;        lineAnimationProportion = 2.2;    }        lineImageView = [[UIImageView alloc] initWithFrame:CGRectMake(lineX, lineY, lineWidth, 2)];    lineImageView.image = [UIImage imageNamed:@"scan_line_image.png"];    [self.view addSubview:lineImageView];        timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(lineAnimation) userInfo:nil repeats:YES];}#pragma mark Target Action- (void)lineAnimation{        if (upOrDown == NO){        num++;        lineImageView.frame = CGRectMake(lineX, lineY + lineAnimationProportion * num, lineWidth, 2);        if (2 * num == 260)        {            upOrDown = YES;        }    }else{        num--;        lineImageView.frame = CGRectMake(lineX, lineY + lineAnimationProportion * num, lineWidth, 2);        if (num == 0){            upOrDown = NO;        }    }}- (void)openCamera{    self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];    NSError *error = nil;    self.input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:&error];    if (error) {        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"未获得授权使用摄像头" message:@"请在iOS『设置』-『隐私』-『相机』中打开" delegate:self cancelButtonTitle:@"知道了" otherButtonTitles:nil, nil];        alert.tag = 840;        [alert show];        return;    }    self.output = [[AVCaptureMetadataOutput alloc] init];    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];    self.session = [[AVCaptureSession alloc] init];    [self.session setSessionPreset:AVCaptureSessionPresetHigh];    if ([self.session canAddInput:self.input]){        [self.session addInput:self.input];    }    if ([self.session canAddOutput:self.output]){        [self.session addOutput:self.output];    }    self.output.metadataObjectTypes =  @[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeCode128Code];    self.preView = [AVCaptureVideoPreviewLayer layerWithSession:self.session];    self.preView.videoGravity = AVLayerVideoGravityResizeAspectFill;    self.preView.frame = CGRectMake((kScreenWidth - kScreenHeight/2)/2, 64+40, kScreenHeight/2, kScreenHeight/2);    [self.view.layer insertSublayer:self.preView atIndex:0];    [self.session startRunning];}#pragma mark AVCaptureMetadataOutputObjectsDelegate- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{    if ([metadataObjects count] > 0){        AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects objectAtIndex:0];        NSString *string = metadataObject.stringValue;              NSLog(@"二维码信息：%@", string);                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"扫描出来的信息" message:string delegate:self cancelButtonTitle:@"ok" otherButtonTitles:nil, nil];        [alert show];                        // 这里可以进行跳转或者返回            }    [self.session stopRunning];                }- (UIStatusBarStyle)preferredStatusBarStyle{    return UIStatusBarStyleLightContent;}@end