這裡我用了系統的東西簡單的實現了一下掃描二維碼

.h

#import <UIKit/UIKit.h>

#import <AVFoundation/AVFoundation.h>

@interface saoMiaoViewController : UIViewController

@property(nonatomic,retain) UIView * sanRectView;

//硬體裝置

@property(nonatomic,retain) AVCaptureDevice * device;

//輸入裝置

@property(nonatomic,retain) AVCaptureDeviceInput

//輸出裝置

@property(nonatomic,retain) AVCaptureMetadataOutput * outPut;

//橋樑。連結輸入和輸出裝置

@property(nonatomic,retain)AVCaptureSession * session;

@property(nonatomic,retain)AVCaptureVideoPreviewLayer * preView;

@end

接下來看.m檔案

@interfacesaoMiaoViewController ()<AVCaptureMetadataOutputObjectsDelegate

@end

@implementation saoMiaoViewController

- (void)viewDidLoad {

    [superviewDidLoad];

// Do any additional setup after loading the view.

self.title = @"進入連線";

CGSize windowSize = [UIScreenmainScreen].bounds.size;

CGSize scanSize = CGSizeMake(windowSize.width*3/5, windowSize.width * 3/5);

CGRect scanRect = CGRectMake( ((windowSize.height-scanSize.height)/2)/windowSize.height,((windowSize.width-scanSize.width)/2)/windowSize.width,  (scanSize.height+10)/windowSize.height,(scanSize.width + 10)/windowSize.width);

self.device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];

self.input = [AVCaptureDeviceInputdeviceInputWithDevice:self.deviceerror:nil];

self.outPut = [[AVCaptureMetadataOutputalloc] init];

    [self.outPutsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];

self.session = [[AVCaptureSessionalloc] init];

    [self.sessionsetSessionPreset:([UIScreenmainScreen].bounds.size.height<500)?AVCaptureSessionPreset640x480:AVCaptureSessionPresetHigh];

    [self.sessionaddInput:self.input];

    [self.sessionaddOutput:self.outPut];

self.outPut.metadataObjectTypes[email protected][AVMetadataObjectTypeQRCode];

self.preView = [AVCaptureVideoPreviewLayerlayerWithSession:self.session];

self.preView.videoGravity = AVLayerVideoGravityResizeAspectFill;

self.preView.frame = [UIScreenmainScreen].bounds;

self.preView.backgroundColor = [UIColorcolorWithRed:1 green:1 blue:1 alpha:0.7].CGColor;

    [self.view.layerinsertSublayer:self.preViewatIndex:0];

self.sanRectView = [UIViewnew];

    [self.viewaddSubview:self.sanRectView];

self.sanRectView.frame = CGRectMake(0, 0, scanSize.width, scanSize.height);

self.sanRectView.center = CGPointMake(CGRectGetMidX([UIScreenmainScreen].bounds), CGRectGetMidY([UIScreenmainScreen].bounds));

self.sanRectView.layer.borderColor = [UIColorwhiteColor].CGColor;

self.sanRectView.layer.borderWidth = 2;

self.outPut.rectOfInterest =scanRect;

//開始捕獲

    [self.sessionstartRunning];

}

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

{

if ( (metadataObjects.count==0) )

    {

return;

    }

if (metadataObjects.count>0) {

        [self.sessionstopRunning];

AVMetadataMachineReadableCodeObject *metadataObject = metadataObjects.firstObject;

SendUrlViewController * send = [[SendUrlViewControlleralloc] init];

        send.nameUrl = metadataObject.stringValue;

        [self.navigationControllerpushViewController:send animated:YES];

    }

}

此文純屬個人為了記憶而寫。當然要是能幫到別人當然也很開心了A.A