ios - UIScrollview not scrolling interface builder -

i adding uiscrollview interface builder xib file. scrollview child of viewcontroller's view , has other siblings on viewcontroller's view.

now setting contentsize of scrollview in viewdidload method , tried set in viewdidlayoutsubviews method scrollview doesn't scroll. sure content area of scrollview bigger frame of scollview.

every thing works fine when add scrollview in code using following line

self.scrollview = [[uiscrollview alloc] initwithframe:cgrectmake(20.0, 58.0, 282.0, 200.0)] 

but didn't scroll @ when use iboutlet in code here code viewdidload scollview interface builder.

- (void)viewdidload {     [super viewdidload];     alog();      nsuinteger = 0;     float margin = 0.0;     uiimage *previewimg = nil;     (i = 0; < [[_settingsdict objectforkey:@"fullscreenwidgetidsarray"] count]; i++) {         previewimg = [uiimage imagenamed:[nsstring stringwithformat:@"image_%@", _dict[@"images"][i]]];           if (previewimg == nil) {             [uiimage imagenamed:@"image_2.png"];         }          uiimage *backgroundimg = [uiimage imagenamed:@"image_border.png"];         uiimage *backgroundhighlightedimg = [uiimage imagenamed:@"image_selected.png"];         bool selected = [_dict[@"images"][i] unsignedintegervalue] == [_dict[@"id"] unsignedintegervalue];          uiimageview *gridelementview = [[uiimageview alloc] initwithimage:backgroundimg];         [gridelementview sethighlightedimage:backgroundhighlightedimg];         [gridelementview sethighlighted:selected];         gridelementview.userinteractionenabled = yes;         uibutton *button = [uibutton buttonwithtype:uibuttontypecustom];         button.frame = cgrectmake(6, 5, previewimg.size.width, previewimg.size.height);         [button setimage:previewimg forstate:uicontrolstatenormal];         button.contentmode = uiviewcontentmodecenter;          margin = (_scrollview.frame.size.width - kelements_per_row * (gridelementview.frame.size.width + 2*kpreview_border_size))/3;          gridelementview.frame = cgrectmake(margin + i%2*(margin + gridelementview.frame.size.width + 2*kpreview_border_size), margin + i/2*(margin + gridelementview.frame.size.height + 2*kpreview_border_size), gridelementview.frame.size.width + 2*kpreview_border_size, gridelementview.frame.size.height + 2*kpreview_border_size);           button.tag = gridelementview.tag = [_settingsdict[@"fullscreenwidgetidsarray"][i] unsignedintegervalue];         [button addtarget:self action:@selector(previewbtnpressed:) forcontrolevents:uicontroleventtouchupinside];         [_thumbnailsviewsarray addobject:gridelementview];          [gridelementview addsubview:button];         [_scrollview addsubview:gridelementview];      }      _scrollview.contentsize = cgsizemake(_scrollview.frame.size.width, margin + (i/2)*(margin + previewimg.size.height + 2*kpreview_border_size));      nslog(@"contentsize : %@",nsstringfromcgsize(_scrollview.contentsize));   } 

in code adding uibuttons inside scrollview in 2 columns. there total 6 uibuttons needs added in scrollview. these button added scrollview not scroll @ all. making scrollenabled property yes didn't work.

any great.

thanks