iOS实现二维码的扫描功能-华尔子博-奥夏网

// ViewController.m

// QRCode

//

// Created by chenchen on 15/7/30.

//

#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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