iOS AVFoundation 从相册中读取二维码

1、例如在我们的导航栏中设置一个按钮

-(void)setupRightMenuButton{

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"相册中选"style:UIBarButtonItemStylePlaintarget:selfaction:@selector(takeQRCodeFromPic)];

}

2、初始化相册拾取器

-(void)takeQRCodeFromPic{

if([UIImagePickerControllerisSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]){

UIImagePickerController*controller = [[UIImagePickerControlleralloc] init];

controller.delegate =self;

controller.sourceType =UIImagePickerControllerSourceTypeSavedPhotosAlbum;

controller.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;

[selfpresentViewController:controller animated:YEScompletion:NULL];

}else{

UIAlertView* alert = [[UIAlertViewalloc]initWithTitle:@"提示"message:@"设备不支持访问相册，请在设置->隐私->照片中进行设置！"delegate:nilcancelButtonTitle:@"确定"otherButtonTitles:nil,nil];

[alert show];

}

}

3、实现选中照片之后的代理事件，并将图片数据进行转码扫描

- (void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info

{

//1.获取选择的图片

UIImage*image = info[UIImagePickerControllerOriginalImage];

//2.初始化一个监测器CIDetector这个类目前只能识别二维码 不能识别条形码

CIDetector*detector = [CIDetectordetectorOfType:CIDetectorTypeQRCodecontext:niloptions:@{CIDetectorAccuracy:CIDetectorAccuracyHigh}];

[picker dismissViewControllerAnimated:YEScompletion:^{

//监测到的结果数组

NSArray*features = [detector featuresInImage:[CIImageimageWithCGImage:image.CGImage]];

if(features.count >=1) {

/**结果对象 */

CIQRCodeFeature*feature = [features objectAtIndex:0];

NSString*scannedResult = feature.messageString;

RxWebViewController* webViewController = [[RxWebViewController alloc] initWithUrl:[NSURLURLWithString:scannedResult]];

webViewController.navigationItem.hidesBackButton =YES;

[self.navigationController pushViewController:webViewController animated:YES];

}

else{

UIAlertView* alertView = [[UIAlertViewalloc]initWithTitle:@"提示"message:@"该图片没有包含一个二维码！"delegate:nilcancelButtonTitle:@"确定"otherButtonTitles:nil,nil];

[alertView show];

}

}];

}