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];
}
}];
}
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