这应该放在调用名为NewTitle的ViewController的方法中。 就在push或popViewController语句之前。

UIBarButtonItem *newBackButton = 
        [[UIBarButtonItem alloc] initWithTitle:@"NewTitle" 
                                         style:UIBarButtonItemStyleBordered 
                                        target:nil 
                                        action:nil];
[[self navigationItem] setBackBarButtonItem:newBackButton];
[newBackButton release];

使用下面的代码行:

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

self.navigationItem.leftBarButtonItems =[[NSArray alloc] initWithObjects:newBackButton, nil];

self.navigationItem.leftItemsSupplementBackButton = YES;

UIBarButtonItem *btnBack = [[UIBarButtonItem alloc]
                                   initWithTitle:@"Back" 
                                   style:UIBarButtonItemStyleBordered
                                   target:self
                                   action:@selector(OnClick_btnBack:)];
    self.navigationItem.leftBarButtonItem = btnBack;
    [btnBack release];

iOS 11+解决方案-不需要再次创建后退按钮。

将backButtonTitle设置为前一屏幕上的一个空格。

// If navigation is from A -> B, set in A's `viewDidLoad`.
navigationItem.backButtonTitle = " "

斯威夫特版本:

在你的子ViewController中:

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    self.navigationController?.navigationBar.backItem?.title = "TEXT"
}

self.navigationItem.backBarButtonItem = [[[UIBarButtonItem alloc] 
                                              initWithTitle:@"Log out" 
                                              style:UIBarButtonItemStyleDone 
                                              target:nil 
                                              action:nil] autorelease];

你可以把它放在父控制器代码中的任何你喜欢的地方，这允许你为不同的子视图有不同的后退按钮。