1: navigationController 的返回按钮自定义
SecondViewController *secondVC = [SecondViewController new];
//更改UINavigationController的返回按钮
UIBarButtonItem *backButton = [[UIBarButtonItem alloc]init];
backButton.title = @"返回";
[self.navigationItem setBackBarButtonItem:backButton];
[self.navigationController pushViewController:secondVC animated:YES];
原文:http://www.cnblogs.com/code-Officer/p/6255034.html