iOS development----Scan QR code, barcode

1, build scan QR code interface. Storyboard can be used to build

2. Create the object's controller class to manage the scan of QR code

3. Import in this class #import <AVFoundation/AVFoundation.h> Frame

4. Call in Viewdidload

1 [self setupqrcode];

5, implement the above method

- (void) setupqrcode{//1. Get input deviceAvcapturedevice *inputdevice =[Avcapturedevice Defaultdevicewithmediatype:avmediatypevideo]; //2. Create input object based on input deviceAvcapturedeviceinput *inputobj =[[Avcapturedeviceinput alloc] Initwithdevice:inputdevice Error:nil]; //3. Create an Output objectAvcapturemetadataoutput *outputobj =[[Avcapturemetadataoutput alloc] init]; //4, the creation of the output object agent, here set the agent for self, to abide by the agent protocol, implement proxy method[Outputobj setmetadataobjectsdelegate:self queue:dispatch_get_main_queue ()]; //5. Create a sessionAvcapturesession *session =[[Avcapturesession alloc] init]; Self.session= Session;//The session is a global variable, so set to: property//6. Add input and output to session    if([session canaddinput:inputobj]) {[Session addinput:inputobj]; }    if([session canaddoutput:outputobj]) {[Session addoutput:outputobj]; }        //7, set the type of output (be sure to add the input object to the session and then set the output type, otherwise it will be an error)[Outputobj Setmetadataobjecttypes:@[avmetadataobjecttypeqrcode]];
　　
/* This is the type to be set when sweeping the face bar code

[Outputobj setmetadataobjecttypes:

@[avmetadataobjecttypeupcecode,

Avmetadataobjecttypecode39code,

Avmetadataobjecttypecode39mod43code,

Avmetadataobjecttypeean13code,

Avmetadataobjecttypeean8code,

Avmetadataobjecttypecode93code,

Avmetadataobjecttypecode128code,

Avmetadataobjecttypepdf417code,

Avmetadataobjecttypeazteccode,

Avmetadataobjecttypeinterleaved2of5code,

Avmetadataobjecttypeitf14code,

Avmetadataobjecttypedatamatrixcode]];

*/
        // 8. Setting the Preview interface    of sweep surface Avcapturevideopreviewlayer *previewlayer = [Avcapturevideopreviewlayer layerwithsession:session];     = self.view.bounds;    [Self.view.layer insertsublayer:previewlayer Atindex: 0 ];         // 9. Start collecting data (since scanning is a persistent process,)     [Session startrunning];}

6, the implementation of the 4th step of the agent method

#pragmaMark-avcapturemetadataoutputobjectsdelegate implement this proxy method, (this agent inside this one method)-(void) Captureoutput: (Avcaptureoutput *) captureoutput didoutputmetadataobjects: (Nsarray *) metadataobjects fromConnection :(Avcaptureconnection *) connection{//This method is called after the data is scanned. Because the call is very frequent, it is judged that when the data is captured, the scan stops immediately    if(Metadataobjects.count >0) {        //1. Stop Scanning[Self.session stoprunning]; //2. Remove the preview screen[Self.previewlayer Removefromsuperlayer]; //3. Take out the dataAvmetadatamachinereadablecodeobject *obj =[Metadataobjects Lastobject]; NSString*str =Obj.stringvalue; NSLog (@"%@", str);//the STR string here is the information that is swept to the surface, usually the link address. //4, stop scanning animation, display data.
According to the scanned link address, jump to the corresponding interface, display the data    }    }

iOS development----Scan QR code, barcode