IOS scans and generates QR codes, and ios scans

IOS scans and generates QR codes, and ios scans

1. QR code generation

Libqrencode: it is a library written in C language to parse two-dimensional code (QRCode). libqrencode scans two-dimensional code through the CCD camera of the mobile phone. Http://pan.baidu.com/s/1eQs1Epk

To import the libqrencode library, run the following code:

#import <Foundation/Foundation.h>@interface QRCodeGenerator : NSObject+ (UIImage *)qrImageForString:(NSString *)string imageSize:(CGFloat)size;+ (UIImage *) twoDimensionCodeImage:(UIImage *)twoDimensionCode withAvatarImage:(UIImage *)avatarImage;@end

# Import "QRCodeGenerator. h "# import" qrencode. h "enum {qr_margin = 3}; @ implementation QRCodeGenerator + (void) drawQRCode :( QRcode *) code context :( CGContextRef) ctx size :( CGFloat) size {unsigned char * data = 0; int width; data = code-> data; width = code-> width; float zoom = (double) size/(code-> width + 2.0 * qr_margin ); CGRect rectDraw = CGRectMake (0, 0, zoom, zoom); // drawCGContextSetFillColor (ctx, CGColorGe TComponents ([UIColor blackColor]. CGColor); for (int I = 0; I <width; ++ I) {for (int j = 0; j <width; ++ j) {if (* data & 1) {rectDraw. origin = CGPointMake (j + qr_margin) * zoom, (I + qr_margin) * zoom); CGContextAddRect (ctx, rectDraw) ;}+ + data ;}} CGContextFillPath (ctx);} + (UIImage *) qrImageForString :( NSString *) string imageSize :( CGFloat) size {if (! [String length]) {return nil;} QRcode * code = QRcode_encodeString ([string UTF8String], 0, QR_ECLEVEL_L, QR_MODE_8, 1); if (! Code) {return nil;} // create contextCGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB (); CGContextRef ctx = CGBitmapContextCreate (0, size, size, 8, size * 4, colorSpace, interval ); export translateTransform = transform (0,-size); CGAffineTransform scaleTransform = transform (1,-1); CGContextConcatCTM (ctx, transform (translateTransform, scaleTransform )); // draw QR on this context [QRCodeGenerator drawQRCode: code context: ctx size: size]; // get imageCGImageRef qrCGImage = ctx; UIImage * qrImage = [UIImage imageWithCGImage: qrCGImage]; // some values (ctx); CGImageRelease (qrCGImage); CGColorSpaceRelease (colorSpace); QRcode_free (code); return qrImage;} + (UIImage *) values :( UIImage *) twoDimensionCode withAvatarImage :( UIImage *) avatarImage {// two-dimension code QR code CGSize size = twoDimensionCode. size; CGSize size2 = CGSizeMake (1.0/5.5 * size. width, 1.0/5.5 * size. height); UIGraphicsBeginImageContext (size); [twoDimensionCode drawInRect: CGRectMake (0, 0, size. width, size. height)]; [[self avatarImage: avatarImage] drawInRect: CGRectMake (size. width-size2.width)/2.0, (size. height-size2.height)/2.0, size2.width, size2.height)]; UIImage * resultingImage = watermark (); UIGraphicsEndImageContext (); return resultingImage;} + (UIImage *) avatarImage :( UIImage *) avatarImage {UIImage * avatarBackgroudImage = [UIImage imageNamed: @ "icon.png"]; CGSize size = avatarBackgroudImage. size; UIGraphicsBeginImageContext (size); [avatarBackgroudImage drawInRect: CGRectMake (0, 0, size. width, size. height)]; [avatarImage drawInRect: CGRectMake (10, 10, size. width-20, size. height-20)]; UIImage * resultingImage = UIGraphicsGetImageFromCurrentImageContext (); UIGraphicsEndImageContext (); return resultingImage;} @ end

2. Scan

IOS 7 Apple launched its own scanning function. The following code is used:

-(Void) viewWillAppear :( BOOL) animated {[self setupCamera];}-(void) setupCamera {// Device _ device = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeVideo]; // Input _ input = [AVCaptureDeviceInput deviceInputWithDevice: self. device error: nil]; // Output _ 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];} // bar code AVMetadataObjectTypeQRCode _ output. metadataObjectTypes = @ [AVMetadataObjectTypeCode128Code, response, AVMetadataObjectTypeCode39Code, response, AVMetadataObjectTypeCode93Code, avmetadataobjecttype1_response code, AVMetadataObjectTypeQRCode, response, Response] // Preview _ preview = [AVCaptureVideoPreviewLayer layerWithSession: self. session]; _ preview. videoGravity = AVLayerVideoGravityResizeAspectFill; _ preview. frame = CGRectMake (20,110,280,280); [self. view. layer insertSublayer: self. preview atIndex: 0]; // Start [_ session startRunning];} # pragma mark upload-(void) captureOutput :( AVCaptureOutput *) captureOutput didOutputMetadataObjects :( NSArray *) metadataObjects fromConnection :( AVCaptureConnection *) connection {NSString * stringValue; if ([metadataObjects count]> 0) {Region * metadataObject = [metadataObjects objectAtIndex: 0]; stringValue = metadataObject. stringValue;} [_ session stopRunning]; UIAlertView * alert = [[UIAlertView alloc] initWithTitle: @ "prompt" message: [NSString stringWithFormat: @ "Result: % @", stringValue] delegate: self cancelButtonTitle: nil otherButtonTitles: @ "OK", @ "Rescan", nil]; [alert show];}-(void) alertView :( UIAlertView *) alertView clickedButtonAtIndex :( NSInteger) buttonIndex {if (buttonIndex = 0) {[self dismissViewControllerAnimated: YES completion: ^ {[timer invalidate] ;}];} else {[_ session startRunning];}