iOS实现二维码的扫描功能

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直接上代码，就不多废话了

//// 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