如何在 UINavigationController 的 RootViewController 上显示返回按钮?

问题描述

这是我的代码.我想在打开的 rootviewController 上放一个后退按钮.

- (void)selectSurah:(id)sender {SurahTableViewController * surahTableViewController = [[SurahTableViewController alloc] initWithNibName:@"SurahTableViewController" bundle:nil];surahTableViewController.navigationItem.title=@"Surah";surahTableViewController.navigationItem.backBarButtonItem.title=@"返回";UINavigationController *aNavigationController = [[UINavigationController alloc] initWithRootViewController:surahTableViewController];[自我presentModalViewController:aNavigationController动画:YES]；}

我不相信从导航堆栈中弹出根视图控制器是可能的，但你可以用 UIButton 伪造它添加为 UIBarButtonItem 的自定义视图:

UIButton *b = [[UIButton alloc]initWithButtonType:UIButtonTypeCustom];[b setImage:[UIImage imageNamed:@"BackImage.png"] forState:UIControlStateNormal];[b addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];self.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:b];

可以在这里找到合适的iOS UI元素PSD.p>

Here is my code. I want to put a back button on the opening rootviewController.

- (void)selectSurah:(id)sender {

    SurahTableViewController * surahTableViewController = [[SurahTableViewController alloc] initWithNibName:@"SurahTableViewController" bundle:nil];
    surahTableViewController.navigationItem.title=@"Surah";

    surahTableViewController.navigationItem.backBarButtonItem.title=@"Back";

    UINavigationController *aNavigationController = [[UINavigationController alloc] initWithRootViewController:surahTableViewController];

    [self presentModalViewController:aNavigationController animated:YES];   
}

I don't believe it's possible to pop the root view controller off the navigation stack, but you can fake it with a UIButton added as the custom view of a UIBarButtonItem:

UIButton *b = [[UIButton alloc]initWithButtonType:UIButtonTypeCustom];
[b setImage:[UIImage imageNamed:@"BackImage.png"] forState:UIControlStateNormal];
[b addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];
self.leftBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:b];

A suitable PSD of iOS UI elements can be found here.

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