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];

 

2,  方法1在有的navigationBar hidden 的页面不好使，但是还有一种方法如下：

- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view.        self.view.backgroundColor = [UIColor grayColor];    //    UIBarButtonItem * backButton = [[UIBarButtonItem alloc] init];////    backButton.image = [UIImage imageNamed:@"nav_back_n"];//    backButton.title = @"hh";//    [self.navigationItem setBackBarButtonItem:backButton];    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"nav_back_n"] style:UIBarButtonItemStylePlain target:self action:@selector(backAction)];}- (void) backAction{    [self.navigationController popViewControllerAnimated:YES];}