ios7+ scanning QR codes and barcodes for time-consuming operation

IOS7 used to use zxing Zbar to achieve scanning QR code and bar code, from the IOS7 out, the system comes with the API is very powerful, and gradually gave up the use of zxing Zbar,

Directly on the main code:

- (void) setupcamera{Dispatch_async (Dispatch_get_global_queue (Dispatch_queue_priority_default,0), ^{[Hudutils showhudprogress:@""]; Avauthorizationstatus Authstatus=[Avcapturedevice Authorizationstatusformediatype:avmediatypevideo]; if(Authstatus = = avauthorizationstatusauthorized) {//has been authorized                }Else{//No authorizationNSString*Recommand; if(is_ios_8) {Recommand=@"Unable to open camera, go to settings and continue operation \ n Settings ---good business--camera"; }Else{Recommand=@"Unable to receive push message, please go to settings and continue operation \ n Settings ---privacy--camera--good business"; } Uialertview*alert = [[Uialertview alloc]initwithtitle:@"Tips"Message:recommandDelegate: Nil Cancelbuttontitle:@"Determine"Otherbuttontitles:nil];            [Alert show]; return; }            ///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 ()]; _output.rectofinterest=Self.scanImageView.bounds; //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]; }            //Barcode Type Avmetadataobjecttypeqrcode_output.metadataobjecttypes=@[avmetadataobjecttypeqrcode,avmetadataobjecttypeean13code,avmetadataobjecttypeean8code,        Avmetadataobjecttypeupcecode]; Dispatch_async (Dispatch_get_main_queue (),^{    //Preview[hudutils dismiss]; _preview=[Avcapturevideopreviewlayer layerWithSession:self.session]; _preview.videogravity=Avlayervideogravityresizeaspectfill; _preview.frame=Self.view.frame; [Self.view.layer insertSublayer:self.preview Atindex:0]; /*Configure color to start outside viewfinder*/        //ScancropUIView*viewtopscan =[[UIView alloc] Initwithframe:cgrectmake (0,0, ScreenWidth, Self.scanImageView.top)]; UIView*viewbottomscan =[[UIView alloc] Initwithframe:cgrectmake (0, Self.scanImageView.bottom, ScreenWidth, ScreenHeight-Self.scanImageView.bottom)]; UIView*viewleftscan =[[UIView alloc] Initwithframe:cgrectmake (0, Self.scanImageView.top, (screenwidth-self.scanimageview.width)/2, Self.scanImageView.height)]; UIView*viewrightscan =[[UIView alloc] Initwithframe:cgrectmake (Self.scanImageView.right, Self.scanImageView.top, (ScreenWidth-self.scanimageview.width)/2, Self.scanImageView.height)]; Viewtopscan.backgroundcolor= [Uicolor colorwithred:0.0Green0.0Blue0.0Alpha0.2]; Viewbottomscan.backgroundcolor= [Uicolor colorwithred:0.0Green0.0Blue0.0Alpha0.2]; Viewleftscan.backgroundcolor= [Uicolor colorwithred:0.0Green0.0Blue0.0Alpha0.2]; Viewrightscan.backgroundcolor= [Uicolor colorwithred:0.0Green0.0Blue0.0Alpha0.2];        [Self.view Addsubview:viewtopscan];        [Self.view Addsubview:viewbottomscan];        [Self.view Addsubview:viewleftscan];            [Self.view Addsubview:viewrightscan]; /*Configure viewfinder outside the color end*/Self.contentLable.layer.cornerRadius= Self.contentLable.height/2 ; Self.contentLable.layer.backgroundColor= [[Uicolor colorwithred:0.0Green0.0Blue0.0Alpha0.8] Cgcolor]; //Start[_session startrunning];    }); });}

One thing to note is that when initializing a camera, it can be time-consuming, especially apparent on the iphone 4 machine, and simple, plus an asynchronous operation to solve the problem.

ios7+ scanning QR codes and barcodes for time-consuming operation