一、生成二维码（使用coreImage.framework）
- (CIImage *)createQRForString:(NSString *)qrString {
// Need to convert the string to a UTF-8 encoded NSData object NSData *stringData = [qrString dataUsingEncoding:NSUTF8StringEncoding]; // Create the filter CIFilter *qrFilter = [CIFilter filterWithName:@"CIQRCodeGenerator"]; // Set the message content and error-correction level [qrFilter setValue:stringData forKey:@"inputMessage"]; [qrFilter setValue:@"M" forKey:@"inputCorrectionLevel"]; // Send the image back return qrFilter.outputImage; }- (UIImage *)createNonInterpolatedUIImageFormCIImage:(CIImage *)image withSize:(CGFloat) size {
CGRect extent = CGRectIntegral(image.extent); CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent)); // create a bitmap image that we'll draw into a bitmap context at the desired size; size_t width = CGRectGetWidth(extent) * scale; size_t height = CGRectGetHeight(extent) * scale; CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray(); CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone); CIContext *context = [CIContext contextWithOptions:nil]; CGImageRef bitmapImage = [context createCGImage:image fromRect:extent]; CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone); CGContextScaleCTM(bitmapRef, scale, scale); CGContextDrawImage(bitmapRef, extent, bitmapImage); // Create an image with the contents of our bitmap CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef); // Cleanup CGContextRelease(bitmapRef); CGImageRelease(bitmapImage); return [self imageBlackToTransparent:[UIImage imageWithCGImage:scaledImage] withRed:20.0f andGreen:70.0f andBlue:60.0f]; } void ProviderReleaseData (void *info, const void *data, size_t size){ free((void*)data); }然后用一句话调用
[self.imageview setImage:[self createNonInterpolatedUIImageFormCIImage:[self createQRForString:@"今天"] withSize:size]];
就可生成二维码。
二、扫描二维码、条形码（使用AVFoundation.framework）
1.导入#import <AVFoundation/AVFoundation.h>，遵循AVCaptureMetadataOutputObjectsDelegate协议
，并实现- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection这个方法。2.声明
@property (strong,nonatomic)AVCaptureDevice * device; //设备
@property (strong,nonatomic)AVCaptureDeviceInput * input; //输入流 @property (strong,nonatomic)AVCaptureMetadataOutput * output; //输出流 @property (strong,nonatomic)AVCaptureSession * session;//捕捉会话 @property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview; //预览图层在viewDidLoad中实现
_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
_input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
_output = [[AVCaptureMetadataOutput alloc]init];
[_output setRectOfInterest:CGRectMake((Height/3.0-10)/Height,0,(Height/3.0+20)/Height,1)];
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
self.session = [[AVCaptureSession alloc]init];
if ([_session canSetSessionPreset:AVCaptureSessionPreset1920x1080]) { [_session setSessionPreset:AVCaptureSessionPreset1920x1080]; } else if ([_session canSetSessionPreset:AVCaptureSessionPreset1280x720]) { [_session setSessionPreset:AVCaptureSessionPreset1280x720]; } else { [_session setSessionPreset:AVCaptureSessionPresetPhoto]; }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 =@[AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code];_output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];
_preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session]; _preview.videoGravity = AVLayerVideoGravityResizeAspectFill; _preview.frame =CGRectMake(0,0,Width,Height); [self.view.layer insertSublayer:self.preview atIndex:0]; // 开启 [_session startRunning];在代理方法中实现下面代码
if ([metadataObjects count] >0)
{／／结束
[_session stopRunning]; //扫描到以后 AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0]; NSLog(@"%@",metadataObject.stringValue); [self playBeep];／／添加声音 self.textlabel.text=[NSString stringWithFormat:@"扫描信息：%@",metadataObject.stringValue]; }使用此方法可以添加扫描到信息成功的声音
- (void)playBeep{
SystemSoundID soundID; NSString *path = [NSString stringWithFormat:@"/System/Library/Audio/UISounds/%@.%@",@"lock",@"caf"]; AudioServicesCreateSystemSoundID((__bridge CFURLRef)[NSURL fileURLWithPath:path], &soundID); AudioServicesPlaySystemSound(soundID); AudioServicesPlaySystemSound(kSystemSoundID_Vibrate); }
三、识别相册中的二维码（使用coreImage.framework）
1.不用导入文件，遵循UIImagePickerControllerDelegate,UINavigationControllerDelegate两个协议
2.打开相册
UIImagePickerController *imagePicker = [[UIImagePickerController alloc]init];
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; imagePicker.delegate = self; [self presentViewController:imagePicker animated:YES completion:nil];3.
//选中图片的回调
-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { NSString *content = @"" ; //取出选中的图片 UIImage *pickImage = info[UIImagePickerControllerOriginalImage]; NSData *imageData = UIImagePNGRepresentation(pickImage); CIImage *ciImage = [CIImage imageWithData:imageData]; //创建探测器 CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{CIDetectorAccuracy: CIDetectorAccuracyLow}]; NSArray *feature = [detector featuresInImage:ciImage]; //取出探测到的数据 for (CIQRCodeFeature *result in feature) { content = result.messageString; } NSLog(@"%@",content); [picker dismissViewControllerAnimated:YES completion:nil]; //进行处理(音效、网址分析、页面跳转等) }