从当前上下文推送导航

Question

你好，我有两个 Viewcontroller A 和 B，我要介绍 B Controller from A Controller with Current Context 我在下面粘贴了我的代码。我只想从 B 控制器推送到 C 控制器，我知道当我们呈现时没有分配导航控制器，如果我用 rootviewcontroller 呈现 navigationcontroller 我无法实现透明效果。

 UIStoryboard *story = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
        ChooseAddressVc *sec=[story instantiateViewControllerWithIdentifier:@"ChooseAddressVc"];
        sec.myDelegate = self;
        sec.modalPresentationStyle = UIModalPresentationOverCurrentContext;
        sec.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
        [self presentViewController:sec animated:YES completion:^{

        }];

从 Viewcontroller B 推到 C

UIStoryboard*Story=[UIStoryboard storyboardWithName:@"Main2" bundle:nil];
    AddNewAddressVc*choose=[Story instantiateViewControllerWithIdentifier:@"AddNewAddressVc"];
    [self.navigationController pushViewController:choose animated:YES];

注意：当我呈现当前上下文时，我需要从 B 推送到 C 控制器。 为了更好地理解：我们无法将导航控制器分配为 ROOT VIEWCONTROLLER，因为我们需要获得透明效果

Answer 1

在您的情况下，B 视图控制器中的 self.navigationController 为零。您需要使用 B 视图控制器创建 UINavigationController 作为 rootViewController。 Present 从 A 创建 UINavigationController 而不是 Present B 视图控制器，之后您可以在 B 视图控制器中使用 self.navigationController。

您编辑的代码：

    UIStoryboard *story = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
    ChooseAddressVc *sec=[story instantiateViewControllerWithIdentifier:@"ChooseAddressVc"];
    sec.myDelegate = self;

    UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:sec];
    navController.modalPresentationStyle = UIModalPresentationOverCurrentContext;
    navController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

    [self presentViewController:navController animated:YES completion:^{

    }];

从当前上下文推送导航

Push navigation from current context

objective-c

uinavigationcontroller

ios

presentviewcontroller