Two-dimensional code

use System to generate/scan QR code

• IOS7 start Apple integrated QR code generation Scan # # # # # # # # # # # # # # # #

• Import Coreimage Frame #import <CoreImage/CoreImage.h>

• Generate two-dimensional code with filter cifilte content (traditional barcode can only put numbers)

• Plain text

• Card

• Url

generate two-dimensional code

//1. Creating FiltersCifilter *filter = [Cifilter filterwithname:@"Ciqrcodegenerator"]; //2. Restore Default[Filter setdefaults]; //3. Add data to the filter (regular expressions/accounts and Passwords)NSString *datastring =@"http://www.520it.com"; NSData*data =[datastring datausingencoding:nsutf8stringencoding]; [Filter setvalue:data Forkeypath:@"InputMessage"]; //4. Get the output of the QR codeCiimage *outputimage =[Filter outputimage]; //because the generated two-dimensional code is blurred, so through the createnoninterpolateduiimageformciimage:outputimage to obtain high-definition QR code image//5. Display two-dimensional codeSelf.imageView.image = [Self createnoninterpolateduiimageformciimage:outputimage withsize: -]; /** * ciimage generate a specified size UIImage * * @param image Ciimage * @param size picture width*/-(UIImage *) Createnoninterpolateduiimageformciimage: (Ciimage *) Image withsize: (cgfloat) size{cgrect extent=cgrectintegral (image.extent); CGFloat Scale= MIN (Size/cgrectgetwidth (extent), size/Cgrectgetheight (extent)); //1. Create bitmap;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); //2. Save Bitmap to PictureCgimageref Scaledimage =cgbitmapcontextcreateimage (BITMAPREF);    Cgcontextrelease (BITMAPREF);    Cgimagerelease (BitmapImage); return[UIImage imagewithcgimage:scaledimage];}

Scan Two-dimensional code

//1. Create a capture sessionAvcapturesession *session =[[Avcapturesession alloc] init]; Self.session=session; //2. Add input device (data from camera input)Avcapturedevice *device =[Avcapturedevice Defaultdevicewithmediatype:avmediatypevideo]; Avcapturedeviceinput*input =[Avcapturedeviceinput Deviceinputwithdevice:device Error:nil];    [Session Addinput:input]; //3. Add Output data (example Object----class object-------the meta -class object)Avcapturemetadataoutput *output =[[Avcapturemetadataoutput alloc] init];    [Output Setmetadataobjectsdelegate:self queue:dispatch_get_main_queue ()];    [Session Addoutput:output]; //3.1. Set the type of the input metadata (type is the QR code data)[Output SETMETADATAOBJECTTYPES:@[AVMETADATAOBJECTTYPEQRCODE]]; //4. Add a scan layerAvcapturevideopreviewlayer *layer =[Avcapturevideopreviewlayer layerwithsession:session]; Layer.frame=Self.view.bounds;    [Self.view.layer Addsublayer:layer]; Self.layer=layer; //5. Start scanning[Session startrunning];

Methods that are called by the scan

//This method is executed when the data is scanned- (void) Captureoutput: (Avcaptureoutput *) captureoutput didoutputmetadataobjects: (Nsarray *) metadataobjects fromConnection :(Avcaptureconnection *) connection{if(Metadataobjects.count >0) {        //get scanned data, last time the latest scanned dataAvmetadatamachinereadablecodeobject *Object=[Metadataobjects Lastobject]; NSLog (@"%@",Object. StringValue); //Stop Scanning[Self.session stoprunning]; //to remove a preview layer[Self.layer Removefromsuperlayer]; } Else{NSLog (@"no scan to data"); }}

Two-dimensional code