Navigate VC's left and right item code

The code controls the left and right item:
　　 UIButton *btncancel = [UIButton buttonwithtype:uibuttontypecustom];    btncancel.frame=cgrectmake (0, 0, 60, 3 0);    btncancel.titlelabel.font=[uifont systemfontofsize:13];    Btncancel.contenthorizontalalignment = uicontrolcontenthorizontalalignmentleft;    [BtnCancel setTitle:@] Back to "forstate:uicontrolstatenormal];    [btncancel addtarget:self action: @selector (Buttoncancel:) forcontrolevents:uicontroleventtouchupinside];    self.navigationitem.leftbarbuttonitem=[[ Uibarbuttonitem Alloc] initwithcustomview:btncancel];        UIButton *btncommit = [UIButton buttonwithtype:uibuttontypecustom];    Btncommit.frame=cgrectmake (0, 0, max);    Btncommit.titlelabel.font=[uifont systemfontofsize:13];    Btncommit.contenthorizontalalignment = uicontrolcontenthorizontalalignmentright;    [Btncommit settitle:@ "submit" forstate:uicontrolstatenormal];     [Btncancel addTarget:self Action: @selector (commitaction:) forcontrolevents:uicontroleventtouchupinside];    Self.navigationitem.rightbarbuttonitem=[[uibarbuttonitem alloc] initwithcustomview:btncommit];


Other methods:

The first type: This setting out of the appearance of bad control UIImage *searchimage=[uiimage imagenamed:@ "Search.png"]; Uibarbuttonitem *barbtn=[[uibarbuttonitem alloc] Initwithimage:nil style:uibarbuttonitemstyledone target:self action        : @selector (Searchprogram)];    Barbtn.image=searchimage; self.navigationitem.rightbarbuttonitem=barbtn;//Second type: This picture will fill the button, the size controllable Uibutton*rightbutton = [[UIButton alloc]    Initwithframe:cgrectmake (0,0,30,30)];    [Rightbutton setimage:[uiimage imagenamed:@ "Back.png"]forstate:uicontrolstatenormal];    [Rightbutton addtarget:self Action: @selector (Backto) forcontrolevents:uicontroleventtouchupinside];    Uibarbuttonitem*rightitem = [[Uibarbuttonitem Alloc]initwithcustomview:rightbutton];  Self.navigationitem.leftbarbuttonitem= Rightitem; The Third Kind: uibarbuttonitem *anotherbutton = [[Uibarbuttonitem alloc] Initwithbarbuttonsystemitem: Uibarbuttonsystemitembookmarks target:self Action: @selector (Methodtocall:)]; How to make Navigationitem.rightbarbuttonitem hide away? Self.navigationitem.rightbarbuttonitem=nil; can be achieved 

　　

　　

Navigate VC's left and right item code