Question

我有三个View控制器 A，B，C 。我将导航控制器连接到 A 视图控制器。在 A 我有一些按钮，我已将按钮segue连接到 B 视图控制器。单击按钮，我将转到 B 视图控制器。在 B 视图控制器上我点击表视图项时有 UITableView 我正在启动 C 视图controller.below是该代码

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if(indexPath.row==0)
    {
        NSLog(@"first cell");
        UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
        UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:@"BusinessCard"];
        [self presentViewController:vc animated:YES completion:nil];

    }
    else if(indexPath.row==1)
    {
         NSLog(@"second cell");


    }
    else if(indexPath.row==2)
    {
         NSLog(@"third cell");

    }

}

但是在 C 视图控制器上，导航栏没有出现。我认为C视图控制器没有链接到导航控制器。

Answer 1

使用navigationController推送方法在C viewController中显示导航栏

试试这段代码：

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
        UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:@"BusinessCard"];
        [self.navigationController pushViewController:vc animated:YES];

Answer 2

使用以下代码

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:@"BusinessCard"];
UINavigationController *nav=[[UINavigationController alloc] initWithRootViewController:vc];
[self presentViewController:nav animated:YES completion:nil];

您需要使用UINavigationController作为模式来呈现它。

希望它有所帮助。

Answer 3

使用它：

 [self.navigationController pushViewController:vc animated:YES];

Answer 4

您可以使用“推送”segue并将ViewController嵌入导航控制器，然后使用其导航控制器的功能，如pushViewController和popViewControllerAnimated

Answer 5

答案都是正确的，但我只是想解释一下......

//This line gets the storyboard with the name "Main" which contains all
//the setup you made for UI (User interface)
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];

//While this like gets the view inside your storyboard with
//storyboard ID/indentifier `BusinessCard `
UIViewController * vc = [storyboard instantiateViewControllerWithIdentifier:@"BusinessCard"];

//Lastly, this line is correct presenting the viewcontroller BUT this doesn't add your
//viewcontroller to the array of viewControllers inside navigationController
//
//Also, this line makes you present the viewController above the 
//rootViewController of window which is in your case the navigationController
//
This is you Error
[self presentViewController:vc animated:YES completion:nil];

//This is what you are looking for, and the correct one for your implementation
//
//This will let you add the `vc`(viewController) to the array of viewController 
//in navigationController, to confirm that you can check the `self.navigationController.viewControllers`
//which will return the array of viewController inside your navigationController
This is the Answer
[self.navigationController pushViewController:vc animated:YES];

希望这会对你有所帮助，我的解释是可以理解的..干杯

如何在视图控制器上获取导航栏？

5 个答案: