呈现视图中的导航控制器

Question

我是 IOS 编程新手。我想问一下如何在呈现的视图中实例化导航控制器。这就是我从以前的视图中实例化我的导航栏的方式。

SWRevealViewController *revealController = self.revealViewController;

    UINavigationController *frontNavigationController = (id) revealController.frontViewController;

    if ( ! [frontNavigationController.topViewController isKindOfClass:[CalibrateViewController class]]) {
        CalibrateViewController *promotionViewController = [[CalibrateViewController alloc] init];
        UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:promotionViewController];
        [revealController setFrontViewController:navigationController animated:YES];
    }
    else {
        [revealController revealToggle:self];
    }

但是当我想用现在的观点来做的时候，

LoginViewController *promotionViewController = [[LoginViewController alloc] init];
[self presentViewController:promotionViewController animated:YES completion:nil];

当我想使用 presentView 实例化时，我不知道该放什么。

任何帮助将不胜感激。提前致谢。

很抱歉给您带来了困惑。基本上我想做这样的事情：

1. 我有一个主视图，我们将其命名为 viewA，它会调出一个 viewB。
2. viewB 然后会变成 viewC。
3. 最后，当我关闭 viewC 时，它会返回 viewA。
4. 所有视图都将包含导航控制器。

还有，这是稍后在“viewB”、“viewC”上创建的导航按钮。

SWRevealViewController *revealController = [self revealViewController];

[revealController panGestureRecognizer];
[self.view addGestureRecognizer:self.revealViewController.panGestureRecognizer];

UIBarButtonItem *revealButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"reveal-icon.png"] style:UIBarButtonItemStyleBordered target:revealController action:@selector(revealToggle:)];


self.navigationItem.leftBarButtonItem = revealButtonItem;


//check if whether to use barTintColor instead of tintColor. (IOS difference)
if (IS_OS_7_OR_LATER) {
    // here you go with iOS 7
    self.navigationController.navigationBar.barTintColor = UIColorFromRGB(0x808080);
}
else
{
    self.navigationController.navigationBar.tintColor = UIColorFromRGB(0x808080);
}

self.navigationController.navigationBar.translucent = YES;
//=======================================================================================

它在实例化导航按钮的视图上给出错误。 错误如下所示： * 由于未捕获的异常 'NSInvalidArgumentException' 导致应用程序终止，原因：'* -[__NSArrayM insertObject:atIndex:]: object cannot be nil'

Answer 1

尝试使用以下代码代替您的代码：

UINavigationController *frontNavigationController = (id)revealController.frontViewController;

  if ( ! [frontNavigationController.topViewController isKindOfClass:[CalibrateViewController class]]) {
        CalibrateViewController *promotionViewController = [[CalibrateViewController alloc] init];
        UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:promotionViewController];
        [self.navigationController pushViewController:navigationController animated:YES];
    }
    else {
        [revealController revealToggle:self];
    }

Answer 2

这是在特定视图控制器上显示导航控制器的方式

LoginViewController *promotionViewController = [[LoginViewController alloc] init];
UINavigationController *navigationController = [[UINavigationController alloc]init];
[navigationController pushViewController:promotionViewController animated:YES];
[self presentViewController:navigationController animated:YES completion:nil];

Answer 3

基本上现在的modelviewcontroller没有导航控制器，我们需要编写代码，请按照以下代码进行

NextViewController *ivc= [[NextViewController alloc]init]; // here you are allocation your next viewController
UINavigationController *naviCtrl =[[UINavigationController alloc]initWithRootViewController: ivc]; // here you are allocation navigation controller for your next viewController
[self presentViewController:naviCtrl animated:YES completion:nil];   // here you are presenting your next view controller