objective c - How do I show a navigation bar on top of quicklook view on ios? -

i have controller in application responsible loading quicklook view of csv file. file loads fine , i'm able render quicklook view without error. problem i'm facing giving user ability close quicklook view.

i trying render navigation bar close button part of view rendering quick look. navigation bar not show up. i'm setting elements after viewdidload. here code controller.

#import "jornadadocpreviewviewcontroller.h"  @interface jornadadocpreviewviewcontroller ()  @end  @implementation jornadadocpreviewviewcontroller  -(id)initwidtharray:(nsarray*)array; {     self = [super init];      if(self)     {         arrayofdocuments = array;      }      return self; }   - (void)viewdidload {     [super viewdidload];     // additional setup after loading view.      self.datasource = self;      // item preview     [self setcurrentpreviewitemindex:0];      self.delegate = self;     uibarbuttonitem *closebutton = [[uibarbuttonitem alloc] initwithtitle:@"close"                                                                     style:uibarbuttonitemstyleplain                                                                    target:self                                                                    action:@selector(closethis)];      nsarray *mytoolbaritems = [nsarray arraywithobjects:closebutton, nil];     self.toolbaritems = mytoolbaritems;     }  - (void)didreceivememorywarning {     [super didreceivememorywarning];     // dispose of resources can recreated.  }  - (void)viewwillappear:(bool)animated {     [super viewwillappear:animated];     self.navigationcontroller.toolbarhidden = no; }  - (void)viewwilldisappear:(bool)animated {     [super viewwilldisappear:animated];     self.navigationcontroller.toolbarhidden = yes; }  - (nsinteger) numberofpreviewitemsinpreviewcontroller: (qlpreviewcontroller *) controller {     return [arrayofdocuments count]; }  /*---------------------------------------------------------------------------  *  *--------------------------------------------------------------------------*/ - (id <qlpreviewitem>)previewcontroller: (qlpreviewcontroller *)controller previewitematindex:(nsinteger)index {     // break path components (filename , extension)     nsarray *filecomponents = [[arrayofdocuments objectatindex: index] componentsseparatedbystring:@"."];       // use filename (index 0) , extension (index 1) path     nsstring *path = [[nsbundle mainbundle] pathforresource:[filecomponents objectatindex:0] oftype:[filecomponents objectatindex:1]];      nslog(@"path %@", [filecomponents objectatindex:0]);      return [nsurl fileurlwithpath:[arrayofdocuments objectatindex: index]]; }   @end 

------ i've tried ----- doesn't seem doing trick

uiview *previewview = [[uiview alloc] initwithframe:cgrectmake(20, 20, self.view.frame.size.width - 20, self.view.frame.size.height - 20)];      //[self.view addsubview:previewview];      jornadadocpreviewviewcontroller *previewer = [[jornadadocpreviewviewcontroller alloc] initwidtharray:value];      [previewview.window setrootviewcontroller:previewer ];     //[self.view bringsubviewtofront:previewview];      [self.navigationcontroller pushviewcontroller:previewer animated:yes]; 

don't directly show preview controllers view. instead, push preview controller navigation controller stack , navigation bar automatically shown done button (which call delegate when appropriate).