Question

我有一个带UIToolbar的UIViewController（在底部），我想在里面添加一个带UINavigationBar的UINavigationController。但是不显示UINavigationController。

MyViewController.m：

- (void)viewDidLoad
{
    [super viewDidLoad];

    int toolBarHeight = 44;
    UIToolbar *toolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, [self.view bounds].size.height-toolBarHeight, [self.view bounds].size.width, toolBarHeight)];

    UIBarButtonItem *button = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemRefresh target:nil action:nil];
    toolBar.items = @[button];

    [self.view addSubview:toolBar];

    MyNavigationController *myNav = [[MyNavigationController alloc] init];

    [self addChildViewController:myNav];
}

Answer 1

将视图控制器添加为子视图控制器是不够的。您还需要将导航控制器的视图添加为容器视图控制器视图的子视图。

[myNav willMoveToParentViewController:self];
myNav.view.frame = navFrame;  //Set a frame or constraints
[self.view addSubview:myNav.view];
[self addChildViewController:myNav];
[myNav didMoveToParentViewController:self];

有关详细信息，请参阅the View Controller Programming Guide。

Answer 2

对于 swift 5

let childNavController = UINavigationController()
parrentVC.addChild(childNavController)
parrentVC.view.addSubview(childNavController.view)
//Add constraints or frame for childNavController here.
childNavController.didMove(toParent: parrentVC)

在UIViewController中添加UINavigationController

2 个答案: