iOS 原生态API实现二维码的扫描功能

wyfem

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 addOutpututput];
    [session startRunning];

[Objective-C]代码

1. //
   
2. //  ViewController.m
   
3. //  QRCode
   
4. //
   
5. //  Created by chenchen on 15/7/30.
   
6. //  Copyright (c) 2015年 BSY. All rights reserved.
   
7. //
   
8. #import <AVFoundation/AVFoundation.h>
   
9. #import "ViewController.h"
   
10. @interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>
    
11. 
    
12. @end
    
13. 
    
14. @implementation ViewController
    
15. 
    
16. - (void)viewDidLoad {
    
17.     [super viewDidLoad];
    
18.    
    
19.      
    
20.      
    
21.     AVCaptureSession *session = [[AVCaptureSession alloc] init];
    
22.     AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
23.     NSError *error = nil;
    
24.      
    
25.     AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device
    
26.                                                                         error:&error];
    
27.     if (input) {
    
28.         [session addInput:input];
    
29.     } else {
    
30.         NSLog(@"Error: %@", error);
    
31.     }
    
32.     AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
    
33.     //设置扫码支持的编码格式(如下设置条形码和二维码兼容)
    
34.     [output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]];
    
35.     [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
36.     [session addOutput:output];
    
37.     [session startRunning];
    
38. }
    
39. 
    
40. #pragma mark - AVCaptureMetadataOutputObjectsDelegate
    
41. - (void)captureOutput:(AVCaptureOutput *)captureOutput
    
42. didOutputMetadataObjects:(NSArray *)metadataObjects
    
43.        fromConnection:(AVCaptureConnection *)connection
    
44. {
    
45.     NSString *QRCode = nil;
    
46.     for (AVMetadataObject *metadata in metadataObjects) {
    
47.         if ([metadata.type isEqualToString:AVMetadataObjectTypeQRCode]) {
    
48.             // This will never happen; nobody has ever scanned a QR code... ever
    
49.             QRCode = [(AVMetadataMachineReadableCodeObject *)metadata stringValue];
    
50.             break;
    
51.         }
    
52.     }
    
53.      
    
54.     NSLog(@"QR Code: %@", QRCode);
    
55. }
    
56. - (void)didReceiveMemoryWarning {
    
57.     [super didReceiveMemoryWarning];
    
58.     // Dispose of any resources that can be recreated.
    
59. }
    
60. 
    
61. @end

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renxiao2003

我做Android的二维码扫描难死了。