iphone - 如何在导航栏上放置后退按钮

Question

我是 iPhone 新手。我有一个小疑问，我创建了一个项目，因为当我单击它时，我放置了一个按钮，它会在 UIView 中打开 UIWebView 我想要一个导航栏后退按钮怎么可能。为此，我编写了一些代码，但在这里我无法创建后退按钮。如果有人知道这一点，请帮助我......我为此编写了以下代码

BiblePlayerViewController.m

- (IBAction)aboutUsButtonClicked:(id)sender {

         UIWebView *aboutUsWebView = [[UIWebView alloc]initWithFrame:CGRectMake(0,44, 320, 460)];
        [self.view addSubview:aboutUsWebView];
        [aboutUsWebView setOpaque:NO];
        aboutUsWebView.backgroundColor = [UIColor whiteColor];
        aboutUsWebView.delegate = self;

        [aboutUsWebView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.ayansys.com/"]]];

       biblePlayerController = [[BiblePlayerViewController alloc]initWithNibName:@"BiblePlayerViewController" bundle:nil];

        navigationController = [[UINavigationController alloc]init];
        navigationController.view.frame = CGRectMake(0, 0, 320, 44);
        [self.view addSubview:navigationController.view];

         self.navigationController.navigationBar.tintColor=[UIColor orangeColor];

        UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStylePlain target:self action:@selector(GotoBiblePlayerViewController)];          

        self.navigationItem.leftBarButtonItem = backButton;   
}

Answer 1

[self.navigationController setNavigationBarHidden:NO animated:YES]; 

将其放入您的 viewDidAppear、viewDidLoad 或 viewWillAppear 中。

或者这个:

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:nil action:nil];
self.navigationItem.backBarButtonItem = backButton;