????PS:???д?????е????????????????????????Щ???????????????????????????
????IOS ????????????????????(8GB)????????????????????????????????ο??????????????С????????????顣
???????????????????????????????????????С??
?????????????xCode 5.0/IOS 5
???????????????????????? 2.6MB???????????????? 0.03%

????1????????????? Push??popup???????
????[self.navigationController pushViewController:m_navanimated:YES];
????[self.navigationController popViewControllerAnimated:YES];
????????
????pushViewController ?????????ViewController????????ü?????+1
????popViewControllerAnimated   ???????ViewController????????ü?????-1
????????????????????????????????
????-(void)dealloc
????{
????//Objects release here
????[super deallco];
????}
?????????????ü????????==0????????????????????μ???
????????к???[self.navigationController popViewControllerAnimated:YES];??????????????ViewController????????ü??????0???????????dealloc ??????
?????????????
????[self.navigationController pushViewController:m_navanimated:YES];
????[self.navigationController popViewControllerAnimated:YES];
???????????????????????棬?????????????
????Nav_1 *m_nav = [[[Nav_1  alloc] initWithNibName:nil bundle:nil] autorelease];
????[self.navigationController  pushViewController:m_nav  animated:YES];
????????????????????????????