navigationController 的返回按钮自定义

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];
}