Question

我是IOS编程的新手。我想问一下如何在呈现的视图中实例化导航控制器。这是我从上一个视图中实例化导航栏的方法。

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做的时候，

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

当我想使用presentView进行实例化时，我不知道该放什么。

任何帮助将不胜感激。提前谢谢。

很抱歉这个混乱。基本上我想做这样的事情：

我有一个主视图，让我们将它命名为viewA，它将调出一个viewB。
viewB然后将变为viewC。
最后，当我解除我的viewC时，它将返回viewA。
所有视图中都会有导航控制器。

你好，这是稍后在＆＃34; viewB＆＃34;，＆＃34; viewC＆＃34;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： *由于未捕获的异常终止应用＆＃39; NSInvalidArgumentException＆＃39;，原因：＆＃39; * - [__ NSArrayM insertObject：atIndex：]：对象不能为零

Answer 1

这是您在特定视图控制器上呈现navigationcontroller的方法

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

Answer 2

查看此链接可能对您有用Click Here

Answer 3

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 4

基本上，Presentmodelviewcontroller没有我们需要编码的导航控制器，请按照下面的代码

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

导航控制器在呈现视图中

4 个答案: