iOS 原生扫描二维码

//
//  ViewController.m
//  原生二维码扫描
//
//  Created by kesun-macbook-2 on 16/2/18.
//  Copyright © 2016 年 pilgrim. All rights reserved.
//

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "DetailViewController.h"

@interface ViewController ()< AVCaptureMetadataOutputObjectsDelegate >

@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 )viewDidLoad {
    [ super viewDidLoad ];
   
    // 设备
    self . device = [ AVCaptureDevice defaultDeviceWithMediaType : AVMediaTypeVideo ];
   
    // 输入流
    NSError * error = nil ;
    self . input = [ AVCaptureDeviceInput deviceInputWithDevice : self . device error :&error];
    if (error) {
        NSLog ( @" 输入流创建报错 " );
        return ;
    }
   
    // 输出流
    self . output = [[ AVCaptureMetadataOutput alloc ] init ];
    [ self . output setMetadataObjectsDelegate : self queue : dispatch_get_main_queue ()];
   
    //session
    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 ] ;
   
    //preview
    self . preview = [ AVCaptureVideoPreviewLayer layerWithSession : self . session ];
    self . preview . videoGravity = AVLayerVideoGravityResizeAspectFill ;
    self . preview . frame = CGRectMake ( 0 , 64 , [ UIScreen mainScreen ]. bounds . size . width , [ UIScreen mainScreen ]. bounds . size . height - 64 );
    [ self . view . layer insertSublayer : self . preview atIndex : 0 ];
   
    //start
    [ self . session startRunning ];
}

- ( void )viewDidAppear:( BOOL )animated
{
    if ( self . session != nil ) {
        if ( self . session . isRunning == NO ) {
            [ self . session startRunning ];
        }
    }
    [ super viewDidAppear :animated];
}

#pragma mark AVCaptureMetadataOutputObjectsDelegate

- ( void )captureOutput:( AVCaptureOutput *)captureOutput didOutputMetadataObjects:( NSArray *)metadataObjects fromConnection:( AVCaptureConnection *)connection
{
    NSString *stringValue;
    if ([metadataObjects count ] > 0 )
    {
        // 停止扫描
        [ _session stopRunning ];
       
        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex : 0 ];
        stringValue = metadataObject. stringValue ;
        NSLog ( @"stringValue:%@" , stringValue);
       
        DetailViewController * detailVC = [[ DetailViewController alloc ] initWithNibName : @"DetailViewController" bundle : nil ];
        detailVC. detailURLStr = stringValue;
        [ self . navigationController pushViewController :detailVC animated : YES ];
    }
}

- ( void )didReceiveMemoryWarning {
    [ super didReceiveMemoryWarning ];
    // Dispose of any resources that can be recreated.
}

@end

参考地址： http://blog.csdn.net/lc_obj/article/details/41549469?utm_source=tuicool&utm_medium=referral