iOS二维码扫描

浏览数：37 / 时间：2015年06月11日

测试环境：iPhone 5s iOS7.1

首先添加框架AVFoundation.framework，然后导入自定义类CMCaptureViewController.h、CMCaptureViewController.m，以及用到的图片资源：[email protected]、[email protected]。

用的时候只需要切换到二维码视图控制器CMCaptureViewController即可，会跳到二维码扫描界面

如：

1 [self presentViewController:captureViewController animated:YES completion:nil];

要获得扫描的二维码内容，只需要成为其委托，实现委托方法

1 - (void)captureController:(CMCaptureViewController *)controller data:(id)metadata;

参数metadata中包含扫描到的字符串。

CMCaptureViewController.h、CMCaptureViewController.m的源代码如下：

 1 //  CMCaptureViewController.h
 2 //  二维码扫描
 3 
 4 #import <UIKit/UIKit.h>
 5 #import <AVFoundation/AVFoundation.h>
 6 
 7 @class CMCaptureViewController;
 8 @protocol CMCaptureViewDelegate <NSObject>
 9 
10 - (void)captureController:(CMCaptureViewController *)controller data:(id)metadata;
11 
12 @end
13 
14 @interface CMCaptureViewController : UIViewController<AVCaptureMetadataOutputObjectsDelegate>
15 {
16     int num;
17     BOOL upOrdown;
18     NSTimer * timer;
19 }
20 @property (strong,nonatomic)AVCaptureDevice * device;
21 @property (strong,nonatomic)AVCaptureDeviceInput * input;
22 @property (strong,nonatomic)AVCaptureMetadataOutput * output;
23 @property (strong,nonatomic)AVCaptureSession * session;
24 @property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview;
25 @property (nonatomic, retain) UIImageView * line;
26 @property (nonatomic, weak) id <CMCaptureViewDelegate> delegate;
27 
28 @end

  1 //  CMCaptureViewController.m
  2 //  二维码扫描
  3 
  4 
  5 #import "CMCaptureViewController.h"
  6 
  7 @interface CMCaptureViewController ()
  8 
  9 @end
 10 
 11 @implementation CMCaptureViewController
 12 
 13 - (void)loadView
 14 {
 15     [super loadView];
 16     self.view.backgroundColor = [UIColor redColor];
 17     UIButton * scanButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
 18     [scanButton setTitle:@"取消" forState:UIControlStateNormal];
 19     scanButton.frame = CGRectMake(100, 420, 120, 40);
 20     [scanButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];
 21     [self.view addSubview:scanButton];
 22     
 23     UILabel * labIntroudction= [[UILabel alloc] initWithFrame:CGRectMake(15, 40, 290, 50)];
 24     labIntroudction.backgroundColor = [UIColor clearColor];
 25     labIntroudction.numberOfLines=2;
 26     labIntroudction.textColor=[UIColor whiteColor];
 27     labIntroudction.text=@"将二维码图像置于矩形方框内，离手机摄像头10CM左右，系统会自动识别。";
 28     [self.view addSubview:labIntroudction];
 29     
 30     
 31     UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 100, 300, 300)];
 32     imageView.image = [UIImage imageNamed:@"pick_bg"];
 33     [self.view addSubview:imageView];
 34     
 35     upOrdown = NO;
 36     num =0;
 37     _line = [[UIImageView alloc] initWithFrame:CGRectMake(50, 110, 220, 2)];
 38     _line.image = [UIImage imageNamed:@"line.png"];
 39     [self.view addSubview:_line];
 40     
 41     timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation1) userInfo:nil repeats:YES];
 42 
 43 }
 44 
 45 
 46 -(void)animation1
 47 {
 48     if (upOrdown == NO) {
 49         num ++;
 50         _line.frame = CGRectMake(50, 110+2*num, 220, 2);
 51         if (2*num == 280) {
 52             upOrdown = YES;
 53         }
 54     }
 55     else {
 56         num --;
 57         _line.frame = CGRectMake(50, 110+2*num, 220, 2);
 58         if (num == 0) {
 59             upOrdown = NO;
 60         }
 61     }
 62 
 63 }
 64 
 65 -(void)backAction
 66 {
 67     
 68     [self dismissViewControllerAnimated:YES completion:^{
 69         [timer invalidate];
 70     }];
 71 }
 72 
 73 
 74 
 75 -(void)viewWillAppear:(BOOL)animated
 76 {
 77     [self setupCamera];
 78 }
 79 - (void)setupCamera
 80 {
 81     // Device
 82     _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
 83 
 84     // Input
 85     _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
 86     
 87     // Output
 88     _output = [[AVCaptureMetadataOutput alloc]init];
 89     [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
 90     
 91     // Session
 92     _session = [[AVCaptureSession alloc]init];
 93     [_session setSessionPreset:AVCaptureSessionPresetHigh];
 94     if ([_session canAddInput:self.input])
 95     {
 96         [_session addInput:self.input];
 97     }
 98     
 99     if ([_session canAddOutput:self.output])
100     {
101         [_session addOutput:self.output];
102     }
103     
104     // 条码类型 AVMetadataObjectTypeQRCode
105     _output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];
106     
107     // Preview
108     _preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session];
109     _preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
110     _preview.frame =CGRectMake(20,110,280,280);
111     [self.view.layer insertSublayer:self.preview atIndex:0];
112     
113     // Start
114     [_session startRunning];
115 }
116 #pragma mark AVCaptureMetadataOutputObjectsDelegate
117 - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
118 {
119    
120     NSString *stringValue;
121     
122     if ([metadataObjects count] >0)
123     {
124         AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
125         stringValue = metadataObject.stringValue;
126         NSLog(@"[%@]", stringValue);
127     }
128     
129     [_session stopRunning];
130 
131     [self dismissViewControllerAnimated:YES completion:^
132     {
133         [timer invalidate];
134         
135         dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
136             if ([self.delegate respondsToSelector:@selector(captureController:data:)])
137             {
138                 [self.delegate captureController:self data:stringValue];
139             }
140         });
141 
142     }];
143 }
144 
145 - (void)didReceiveMemoryWarning
146 {
147     [super didReceiveMemoryWarning];
148     // Dispose of any resources that can be recreated.
149 }
150 
151 
152 
153 @end