当UITabBarController出现时,两个选项卡视图都有不正确的边界.第一个选项卡正确位于导航栏下方,但延伸到底部的选项卡栏下方.第二个选项卡是另一种方式,从导航栏下方开始,但在底部的选项卡栏之前正确停止.
我正在创建和呈现TabBarController,如下所示：
ActiveListTabBarViewController* listTabBarController = [[ActiveListTabBarViewController alloc] initWithListController:_listController];
UINavigationController* nc = [[UINavigationController alloc] initWithRootViewController:listTabBarController];
[self presentViewController:nc animated:YES completion:^(){}];
然后在TabBarController的init中,创建并添加子(tab)视图,如下所示：
_todoListViewController = [[BasicTableViewController alloc] initWithList:[_controller itemsToDo]]; _todoListViewController.delegate = self; _todoListViewController.title = @"To Do"; _completedListViewController = [[BasicTableViewController alloc] initWithList:[_controller itemsDone]]; _completedListViewController.delegate = self; _completedListViewController.title = @"Completed"; [self setViewControllers:@[_todoListViewController,_completedListViewController]];
我究竟做错了什么？
谢谢,
加文
更新：根据建议将以下方法添加到BasicTableViewController：
- (UIRectEdge)edgesForExtendedLayout
{
return UIRectEdgeNone;
}
第一个选项卡的行为已得到改进并且位置正确,但第二个选项卡保持不变.情况如下：
有什么建议？
干杯.
解决方法
ActiveListTabBarViewController* listTabBarController = [[ActiveListTabBarViewController alloc] initWithListController:_listController];
UINavigationController* nc = [[UINavigationController alloc] initWithRootViewController:listTabBarController];
[self presentViewController:nc animated:YES completion:^(){}];
回到Apple的文档,我不确定这是否是呈现UITabBarController的有效方式.也就是说,将其呈现为另一个视图控制器的子节点.
不是.以下是为我确认的一些片段;从这一点,以及由此产生的变化,我认为在我上面提供一个TabBarController是不正确的.
Before creating a tab bar interface,you need to decide how you intend
to use a tab bar interface. Because it imposes an overarching
organization on your data,you should use one only in these specific
ways:
- Install it directly as a window’s root view controller.
- Install it as one of the two view controllers in a split view interface. (iPad only)
- Present it modally from another view controller.
- Display it from a popover. (iPad only)
Unlike other view controllers,a tab bar interface should never be
installed as a child of another view controller.
并进一步澄清：
A tab bar controller is a container view controller that you use to
divide your app into two or more distinct modes of operation.A navigation controller presents data that is organized hierarchically
and is an instance of the UINavigationController class. The methods of
this class provide support for managing a stack-based collection of
content view controllers.
我将UITabBarController作为导航控制器的根视图呈现的原因是我想要导航栏…
这就是我现在在TabBarController的init中实现的目标：
- (id)initWithListController:(BasicListController *)controller
{
self = [super init];
if (self) {
_controller = controller;
_todoListViewController = [[BasicTableViewController alloc] initWithList:[_controller itemsToDo]];
_todoListViewController.delegate = self;
_todoListViewController.title = @"To Do";
_completedListViewController = [[BasicTableViewController alloc] initWithList:[_controller itemsDone]];
_completedListViewController.delegate = self;
_completedListViewController.title = @"Completed";
UINavigationController* ncTodo = [[UINavigationController alloc] initWithRootViewController:_todoListViewController];
UINavigationController* ncCompleted = [[UINavigationController alloc] initWithRootViewController:_completedListViewController];
[self setViewControllers:@[ncTodo,ncCompleted]];
UIBarButtonItem* doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Done" style:UIBarButtonItemStylePlain target:self action:@selector(doneTap:)];
_todoListViewController.navigationItem.leftBarButtonItem = doneButton;
_completedListViewController.navigationItem.leftBarButtonItem = doneButton;
}
return self;
}
注意,我没有做任何事情：
> edgesForExtendedLayout
> automaticAdjustsScrollViewInsets
> extendedLayoutIncludesOpaqueBars
