iphone - Disable Border Around System Image Located UINavigationBarItem -

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i want disable border around iphone sdk's add button, it's "+" button (no black bg):

enter image description here

this seems simple task when it's located in toolbar, not when it's located in uinavigationbar. anyways, if knows how, or if it's possible, please share! here's current code in rootviewcontroller.m:

self.title = @"code master"; addbutton = [[uibarbuttonitem alloc]                 initwithbarbuttonsystemitem:uibarbuttonsystemitemadd                  target:self action:@selector(addbuttonclicked:)]; self.navigationitem.rightbarbuttonitem = addbutton;

edit

@dee code works great, displays want! there problem i'll explain:

edit button: left side of uinavigationbar
done button: left side of uinavigationbar (hidden); when edit button clicked, replaces edit button "done" button
plus button: right side of uinavigationbar; hides when in "edit mode", shows when in "normal mode (when done button not visible)"

so problem whenever click edit, done, plus button doesn't return hiding. i'm using exact code , worked previous code. i'm pretty sure it's because in code, theres nothing labelling "addbutton". here's code later on in main file:

-(void)setediting:(bool)editing animated:(bool)animated {     [super setediting:editing animated:yes];     if (editing)     {         self.navigationitem.rightbarbuttonitem = nil;     }     else     {           uibutton *button = [uibutton buttonwithtype:uibuttontypecustom];           [button setimage:[uiimage imagenamed:@"plus.png"] forstate:uicontrolstatenormal];           [button addtarget:self action:@selector(addbuttonclicked:) forcontrolevents:uicontroleventtouchupinside];           [button setframe:cgrectmake(0, 0, 50, 29)];           uibarbuttonitem *barbtn = [[uibarbuttonitem alloc] initwithcustomview:button];           self.navigationitem.rightbarbuttonitem = barbtn;           [barbtn release];     }      [self.tableview reloaddata]; }

create "+" image , set button & give button uibarbuttonitem this: 

uibutton *button = [uibutton buttonwithtype:uibuttontypecustom]; [button setimage:[uiimage imagenamed:@"plus.png"] forstate:uicontrolstatenormal]; [button addtarget:self action:@selector(addbuttonclicked:) forcontrolevents:uicontroleventtouchupinside]; [button setframe:cgrectmake(0, 0, 50, 29)]; uibarbuttonitem *barbtn = [[uibarbuttonitem alloc] initwithcustomview:button]; [self.navigationitem setrightbarbuttonitem:barbtn]; [barbtn release];

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