你可以把这个类别放在AppDelegate中。m文件。 移除UINavigation中所有默认后退按钮的文本。只有箭头“<”或设置自定义图像，如果你需要。

objective - c:

...

@end

@implementation UINavigationItem (Extension)

- (UIBarButtonItem *)backBarButtonItem {

    return [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
}

@end

只用一张图片!

OBJ - c:

- (void)viewDidLoad {
     [super viewDidLoad];
     UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"Icon-Back"]
                                                                                        style:UIBarButtonItemStylePlain
                                                                                       target:self.navigationController
                                                                                       action:@selector(popViewControllerAnimated:)];
     self.navigationItem.leftBarButtonItem = backButton;
}

斯威夫特4:

let backBTN = UIBarButtonItem(image: UIImage(named: "Back"), 
                              style: .plain, 
                              target: navigationController, 
                              action: #selector(UINavigationController.popViewController(animated:)))
navigationItem.leftBarButtonItem = backBTN
navigationController?.interactivePopGestureRecognizer?.delegate = self

Icon-Back.png

Icon-Back@2x.png

Icon-Back@3x.png

你可以在viewWillDisappear上将当前ViewController的标题改为@""，当它即将再次显示时，将标题重新设置为之前的标题。

-(void) viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    self.title = @"Previous Title";
}

-(void) viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    self.title = @"";
}

iOS7有新的界面规则，所以当你推送一个UIView时，最好至少保留后退箭头。 通过编程方式更改“返回”文本非常容易。只需要在推送视图之前添加这段代码(如果你使用的是StoryBoards，可以使用prepareForSegue):

-(void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
      self.navigationItem.backBarButtonItem=[[UIBarButtonItem alloc] initWithTitle:@"NEW TITLE" style:UIBarButtonItemStylePlain target:nil action:nil];
}

这将改变默认的“后退”文本，但将保持iOS7风格的后退箭头。 你也可以在推送视图之前改变后退箭头的颜色:

- (void)viewDidLoad{
     //NavBar background color:
     self.navigationController.navigationBar.barTintColor=[UIColor redColor];
//NavBar tint color for elements:
     self.navigationController.navigationBar.tintColor=[UIColor whiteColor];
}

希望这对你有所帮助!

你不能以你想要的方式访问导航backButtonItem，你需要创建自己的返回按钮，如下所示:

- (void)loadView
{
    [super loadView];
    UIButton *backButton = [[UIButton alloc] initWithFrame: CGRectMake(0, 0, 44.0f, 30.0f)];
    [backButton setImage:[UIImage imageNamed:@"back.png"]  forState:UIControlStateNormal];
    [backButton addTarget:self action:@selector(popVC) forControlEvents:UIControlEventTouchUpInside];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
}

当然了:

- (void) popVC{
  [self.navigationController popViewControllerAnimated:YES];
}

 // add left bar button item

try this code:

- (void)viewDidLoad
{ 
    [super viewDidLoad];

   UIImage* image_back = [UIImage imageNamed:@"your_leftarrowImage.png"];
    CGRect backframe = CGRectMake(250, 9, 15,21);
    UIButton *backbutton = [[UIButton alloc] initWithFrame:backframe];
    [backbutton setBackgroundImage:image_back forState:UIControlStateNormal];
    [backbutton addTarget:self action:@selector(Btn_back:)
         forControlEvents:UIControlEventTouchUpInside];
    [backbutton setShowsTouchWhenHighlighted:YES];
    UIBarButtonItem *backbarbutton =[[UIBarButtonItem alloc] initWithCustomView:backbutton];
    self.navigationItem.leftBarButtonItem=backbarbutton;
    [backbutton release];

}
-(IBAction)Btn_back:(id)sender
{
    [self.navigationController popViewControllerAnimated:YES];

}