导航栏上没有后退按钮 [英] Back button not made on navigation bar

问题描述

我从一个基于导航的项目开始，然后将更多视图推送到控制器上.问题是，如果我没有给导航项目添加标题，则不会绘制后退按钮！仅当我给导航栏指定标题时，后退按钮才会出现.看来如果 NO 标题，苹果不能写"back"或"go back".我不想给导航项目添加标题(我将在视图内部使用标签).那我该如何解决呢?

I started out with a navigation based project and am pushing further views onto the controller. The problem is that if I do not give a title to the navigation item then the back button is not drawn! Only if I give the navigation bar a title, will the back button come. It seems apple could'nt write "back" or "go back" in case of NO title. I do not want to give the navigation item a title(I'll use a label inside my view). So how do I fix this?

- (void)viewDidLoad {
[super viewDidLoad];
self.navigationItem.title = @"Home"; /// <- without setting the title, the back button won't show !
}

在didLoad视图中，如果我删除标题，则后退按钮将不会显示

In the view didLoad method, if I remove the title, the back button won't show

推荐答案

只需自己创建后退按钮即可:

Just create the back button yourself:

- (void)viewDidLoad
{
    [super viewDidLoad];

    UIBarButtonItem *back = [[UIBarButtonItem alloc] initWithTitle:@"Back"
                                                             style:UIBarButtonItemStylePlain
                                                            target:nil
                                                            action:nil];
    [[self navigationItem] setBackBarButtonItem:back];
    [back release];
}

(如果您更喜欢点符号，请按self.navigationItem.backBarButtonItem = back;)

(If you prefer dot notation, self.navigationItem.backBarButtonItem = back;)

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