实现二维码的扫描功能代码,ObjC代码库,德仔网

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【ObjC】实现二维码的扫描功能

作者:zengzhan / 发布于2015/8/3/ 1388


	//
	// 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 *)captureOutput
	didOutputMetadataObjects:(NSArray *)metadataObjects
	 fromConnection:(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

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