iphone - How to add a UIview above the current view controllers view? -

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i have ipad application in trying barcode reading processes.when pressing button in home page presenting barcode reading viewcontrollers view this` 

    zbarreaderviewcontroller *reader = [zbarreaderviewcontroller new];     reader.readerdelegate = self;      reader.supportedorientationsmask = zbarorientationmaskall;      reader.sourcetype=uiimagepickercontrollersourcetypecamera;     //reader.cameradevice = uiimagepickercontrollercameradevicefront;      reader.cameraoverlayview=cameraoverlay;      if( [uiimagepickercontroller iscameradeviceavailable:                         uiimagepickercontrollercameradevicefront ])     {            reader.cameradevice = uiimagepickercontrollercameradevicefront;     }     zbarimagescanner *scanner = reader.scanner;      reader.wantsfullscreenlayout = yes;     // todo: (optional) additional reader configuration here      // example: disable used i2/5 improve performance      [scanner setsymbology: zbar_i25                    config: zbar_cfg_enable                        to: 0];      reader.showszbarcontrols = no;      // present , release controller    [self presentmodalviewcontroller:reader animated:yes];     //[appdel.navigationcontroller pushviewcontroller:reader animated:yes];      //[reader.view addsubview:collect];     [reader.view addsubview:back];       [back addtarget:self action:@selector(backpressed:) forcontrolevents:uicontroleventtouchupinside];     [reader.view addsubview:scan];     [scan addtarget:self action:@selector(getpressed:) forcontrolevents:uicontroleventtouchupinside];      [reader release];

and when pressing scan button added reader view need add view.for doing -(ibaction)getpressed:(id)sender{[self.view addsubview:newview] }.but not added view.can me achieve this? `

you need overlay zbar view , add button overlay view:

//set frame according requirement  aoverlay = [[uiview alloc] initwithframe:cgrectmake(0.0,0.0,320.0,480.0)];  aoverlay.backgroundcolor = [uicolor clearcolor]; uibutton *abtnscan  = [uibutton buttonwithtype:uibuttontyperoundedrect]; [abtnscan setframe:cgrectmake(115, 435, 80, 45)];  [abtnscan addtarget:self action:@selector(getpressed:)forcontrolevents:uicontroleventtouchupinside]; [aoverlay addsubview:abtnscan]; reader.cameraoverlayview = aoverlay;  // code

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