ISO7 Two dimensional code detailed introduction and use Method _ios

Use the system to generate/scan two-dimensional code with its own

IOS7 started the Apple integrated two-dimensional code of the generated scan ### to generate a two-dimensional code of the steps

Import coreimage Framework #import <CoreImage/CoreImage.h>

Generate two-dimensional code ### with filter Cifilte (traditional barcode can only put numbers)

Plain text

Card

Url

Generate a two-dimensional code

 
1. Create filter Cifilter *filter = [Cifilter filterwithname:@ "Ciqrcodegenerator"];

  2. Restore default [filter setdefaults];
  3. Add data to the filter (regular expression/account number and password) nsstring *datastring = @ "http://www.520it.com";
  NSData *data = [datastring datausingencoding:nsutf8stringencoding];

  [Filter Setvalue:data forkeypath:@ "InputMessage"];

  4. Get the output of two-dimensional code ciimage *outputimage = [Filter outputimage]; Because the generated two-dimensional code blur, so through the createnoninterpolateduiimageformciimage:outputimage to get the HD two-dimensional code picture//5. Display two-dimensional code self.imageView.image = [
 Self createnoninterpolateduiimageformciimage:outputimage withsize:300]; /** * Generates the specified size uiimage * * @param image Ciimage * Based on Ciimage * @param size picture Width * * (uiimage *) Createnoninterpolateduiimag
  Eformciimage: (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 picture cgimageref Scaledimage = Cgbitmapcontextcreateimage (bitmapref);
  Cgcontextrelease (BITMAPREF);
  Cgimagerelease (BitmapImage);
return [UIImage Imagewithcgimage:scaledimage];
 

 

 }

scans two-dimensional code

//1. Create capture session avcapturesession *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 (Sample Object--> class object--> object--> root class object) avcapturemetadataoutput *output = [[Avcapturemetadataoutput alloc]
  INIT];
  [Output Setmetadataobjectsdelegate:self queue:dispatch_get_main_queue ()];

  [Session Addoutput:output];

  3.1. Set the type of input metadata (type is two-dimensional code data) [Output SETMETADATAOBJECTTYPES:@[AVMETADATAOBJECTTYPEQRCODE]];
  4. Add Scan layer Avcapturevideopreviewlayer *layer = [Avcapturevideopreviewlayer layerwithsession:session];
  Layer.frame = Self.view.bounds;
  [Self.view.layer Addsublayer:layer];

  Self.layer = layer;
 

 

5. Start scanning [session startrunning]; 

The method that the scan will call

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, the last time the latest scan of the data
    avmetadatamachinereadablecodeobject *object = [metadataobjects lastobject];
    NSLog (@ "%@", object.stringvalue);

    Stop scanning
    [self.session stoprunning];

    Remove the preview layer
    [Self.layer removefromsuperlayer];
  } else {
    NSLog (not scanned to data);
}
 

The above is the iOS two-dimensional code data collation, follow-up continue to supplement the relevant information, thank you for your support of this site!