直接上代码，就不多废话了
（本文来源于图老师网站，更多请访问https://m.tulaoshi.com/bianchengyuyan/）//// ViewController.m// QRCode//// Created by chenchen on 15/7/30.// Copyright (c) 2015年 BSY. All rights reserved.//#import AVFoundation/AVFoundation.h#import "ViewController.h"@interface ViewController ()AVCaptureMetadataOutputObjectsDelegate @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; AVCaptureSession *session = [[AVCaptureSession alloc] init]; AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; NSError *error = nil; AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error]; if (input) {[session addInput:input]; } else {NSLog(@"Error: %@", error); } AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init]; //设置扫码支持的编码格式(如下设置条形码和二维码兼容) [output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]]; [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; [session addOutput:output]; [session startRunning];} #pragma mark - AVCaptureMetadataOutputObjectsDelegate- (void)captureOutput:(AVCaptureOutput *)captureOutputdidOutputMetadataObjects:(NSArray *)metadataObjectsfromConnection:(AVCaptureConnection *)connection{ NSString *QRCode = nil; for (AVMetadataObject *metadata in metadataObjects) {if ([metadata.type isEqualToString:AVMetadataObjectTypeQRCode]) { // This will never happen; nobody has ever scanned a QR code... ever QRCode = [(AVMetadataMachineReadableCodeObject *)metadata stringValue]; break;} } NSLog(@"QR Code: %@", QRCode);}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.} @end 
