NavigationController 上面添加按钮两种方法

1：

self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] 

  initWithBarButtonSystemItem:UIBarButtonSystemItemAction

  target:self action:@selector(ids:)] autorelease];

2：

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"反馈" style:UIBarButtonItemStylePlain target:nil action:nil];

self.navigationItem.leftBarButtonItem = backButton;

[backButton release];