iOS源生二维码扫描，你想象不到的强大

还在用ZBar、ZXing等第三方库来实现二维码扫描吗？那就OUT了。来看下iOS源生的二维码扫描，【测试需真机】

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>//需要添加AVFoundation系统库

@interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>//遵守相应代理

@property (strong,nonatomic) AVCaptureDevice * device;//采集的设备

@property (strong,nonatomic) AVCaptureDeviceInput * input;//设备的输入

@property (strong,nonatomic) AVCaptureMetadataOutput * output;//输出

@property (strong,nonatomic) AVCaptureSession * session;//采集流

@property (strong,nonatomic) AVCaptureVideoPreviewLayer * preview;//窗口

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    UIButton * button = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    [button setTitle:@"iOS原生扫描二维码" forState:UIControlStateNormal];

    button.frame = CGRectMake(50, 100, self.view.bounds.size.width - 100, 50);

    [button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];

    // Do any additional setup after loading the view, typically from a nib.

}

- (void)buttonClick{

    // Device 实例化设备

    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    

    // Input 设备输入

    _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];

    

    // Output 设备的输出

    _output = [[AVCaptureMetadataOutput alloc]init];

    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

    

    // Session

    _session = [[AVCaptureSession alloc]init];

    [_session setSessionPreset:AVCaptureSessionPresetHigh];

    if ([_session canAddInput:self.input])

    {

        [_session addInput:self.input];

    }

    

    if ([_session canAddOutput:self.output])

    {

        [_session addOutput:self.output];

    }

    

    // 条码类型 AVMetadataObjectTypeQRCode

    _output.metadataObjectTypes =@[AVMetadataObjectTypeCode128Code,AVMetadataObjectTypeUPCECode,AVMetadataObjectTypeCode39Code,AVMetadataObjectTypeCode39Mod43Code,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeCode93Code,AVMetadataObjectTypePDF417Code,AVMetadataObjectTypeQRCode,AVMetadataObjectTypeAztecCode,AVMetadataObjectTypeInterleaved2of5Code,AVMetadataObjectTypeITF14Code,AVMetadataObjectTypeDataMatrixCode];

    

    // Preview 扫描窗口设置

    _preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session];

    _preview.videoGravity = AVLayerVideoGravityResizeAspectFill;

    _preview.frame = CGRectMake(20,150,self.view.bounds.size.width - 40,300);

    [self.view.layer insertSublayer:self.preview atIndex:0];

    

    // Start 开始扫描

    [_session startRunning];

}

//解析结果的代理方法

#pragma mark AVCaptureMetadataOutputObjectsDelegate

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection

{

    //得到解析到的结果

    NSString *stringValue;

    

    if ([metadataObjects count] > 0)

    {

        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];

        stringValue = metadataObject.stringValue;

    }

    

    [_session stopRunning];//停止扫描

    

    UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"提示" message:[NSString stringWithFormat:@"结果：%@",stringValue] delegate:self cancelButtonTitle:nil otherButtonTitles:@"知道了",@"重新扫描",  nil];

    [alert show];

}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex

{

    if(buttonIndex == 0)

    {

        [self dismissViewControllerAnimated:YES completion:^

         {

            //

         }];

    }

    else

    {

        //重新扫描

        [_session startRunning];

    }

}

@end