objective c - NSOperationQueue: Can't add UIBarButtonItem in the Toolbar on Main Thread -

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in uiviewcontroller want add uibarbuttonitem in toolbar, new button doesn't appear. doing wrong?

- (void)dologin:(nsstring *)name password:(nsstring *)password {  // 1.: start thread:  nsinvocationoperation *invoperation = [[nsinvocationoperation alloc] initwithtarget:self selector:@selector(backgroundtasklogin:) object:request];  [self.opqueue addoperation:invoperation]; }  - (void)backgroundtasklogin:(nsstring *)request2 {  // 2.: jump in main thread in show cancel button in den toolbar:  [self performselectoronmainthread:@selector(showcancelbutton) withobject:nil waituntildone:no]; }  - (void)showcancelbutton {  // 3.: add new cancel-button in toolbar:  uibarbuttonitem *tempbuttoncancel = [[uibarbuttonitem alloc] initwithbarbuttonsystemitem:uibarbuttonsystemitemcancel target:self action:@selector(cancellogin)];  nsmutablearray *mybuttons = (nsmutablearray *)self.toolbaritems;  nslog(@"count buttons: %d", [self.toolbaritems count]); // debugger: 2   [mybuttons addobject:tempbuttoncancel];  [tempbuttoncancel release];   nslog(@"count buttons: %d", [self.toolbaritems count]); // debugger: 3   // problem: don't see new toolbar-button :-( }

you can't rely on self.toolbaritems being mutable array. may 1 in case if assigned mutable array property before can't expect view controller notice change in property if don't use documented interface.

create new array , use setter assign toolbaritems:

nsmutablearray *newtoolbaritems = [nsmutablearray arraywitharray:self.toolbaritems]; [newtoolbaritems addobject:tempbuttoncancel]; self.toolbaritems = newtoolbaritems;

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