UIToolbar 오른쪽 정렬

UIBarButtonItem *flexibleSpaceLeft = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

UIBarButtonItem *flexibleSpaceRight = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

// item 가운데 정렬 항목

[_toolbar setItems:[NSArray arrayWithObjects:flexibleSpaceLeft, item, flexibleSpaceRight, nil]];

[flexibleSpaceLeft release];

[flexibleSpaceRight release];

[_toolbar setItems:[NSArray arrayWithObjects:itemLeft, flexibleSpaceCenter, itemRight, nil]];