ios - reduce left space and right space from navigation bar left and right bar button item -

i adding 2 custom buttons on navigation bar. 1 @ left , other @ right. done it,

but failed reduce space between starting point , frame of buttons.

i tried lot, gave negative value of x, still didn't helped. here code buttons

-(void)addleftbutton {     uibutton *abutton = [uibutton buttonwithtype:uibuttontypecustom];     abutton.backgroundcolor = [uicolor redcolor];     [abutton settitle:@"h" forstate:uicontrolstatenormal];     abutton.frame = cgrectmake(0.0, 0.0, 40, 40);     [abutton settitlecolor:[uicolor blackcolor] forstate:uicontrolstatenormal];     uibarbuttonitem *abarbuttonitem = [[uibarbuttonitem alloc] initwithcustomview:abutton];     [abutton addtarget:self action:@selector(backbtnclicked:) forcontrolevents:uicontroleventtouchupinside];     [self.navigationitem setleftbarbuttonitem:abarbuttonitem]; }  -(void)addrightbutton {     uibutton *abutton = [uibutton buttonwithtype:uibuttontypecustom];     abutton.backgroundcolor = [uicolor greencolor];     [abutton settitle:@"b" forstate:uicontrolstatenormal];     abutton.frame = cgrectmake(0.0, 0.0, 40, 40);     [abutton settitlecolor:[uicolor blackcolor] forstate:uicontrolstatenormal];     uibarbuttonitem *abarbuttonitem = [[uibarbuttonitem alloc] initwithcustomview:abutton];     [abutton addtarget:self action:@selector(backbtnclicked:) forcontrolevents:uicontroleventtouchupinside];     [self.navigationitem setrightbarbuttonitem:abarbuttonitem]; } 

also tried using

abarbuttonitem.width = -16; 

but didn't helped.

how achieve this...? in advance...

these links preferred didn't helped how edit empty spaces of left, right uibarbuttonitem in uinavigationbar [ios 7]

how edit empty spaces of left, right uibarbuttonitem in uinavigationbar [ios 7]

uibarbuttonitem *negativespacer = [[uibarbuttonitem alloc]                                                            initwithbarbuttonsystemitem:uibarbuttonsystemitemfixedspace                                                            target:nil action:nil];     negativespacer.width = -16;     [self.navigationitem setleftbarbuttonitems:[nsarray arraywithobjects:negativespacer,yourbutton, nil] animated:yes]; 

use that.