切换到 UITableView 控制器并滚动到部分的开头
早上好，
我希望有人能够阐明如何从嵌套在选项卡栏控制器中的 ViewController 切换到嵌套在嵌套在选项卡栏控制器中的导航控制器中的另一个 ViewController，然后滚动表格视图在部分导航控制器中到特定部分。
我至少找到了切换选项卡栏控制器所需的内容
[self.applicationTabBarController setSelectedIndex:1];
，并且能够获得对第二个视图控制器的引用，
UINavigationController *secondTabNavController = (UINavigationController *)[[self.applicationTabBarController viewControllers] objectAtIndex:1];
MyViewController *myViewController = (MyViewController *)[[ordersNav viewControllers] objectAtIndex:0];
但我不清楚的是如何将 UITableView 滚动到特定部分。 我尝试
NSIndexPath *myPath = [NSIndexPath indexPathForRow:0 inSection:3];
[myViewController.ordersTableView scrollToRowAtIndexPath:myPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
当然，
假设第二个视图已加载，并且有第 3 部分。最后，我的第一个视图控制器调用驻留在应用程序委托中的上述代码。
谢谢。
Good Morning,
I'm hoping someone would be able to shed some light on how i can switch from a ViewController nested in a tab bar controller to another ViewController nested in a navigation controller nested in the tab bar controller, and then scroll the table view in the section navigation controller to a specific section.
I have found at least what i need to switch the tab bar controllers with
[self.applicationTabBarController setSelectedIndex:1];
and i am able to get a reference to the second view controller with
UINavigationController *secondTabNavController = (UINavigationController *)[[self.applicationTabBarController viewControllers] objectAtIndex:1];
MyViewController *myViewController = (MyViewController *)[[ordersNav viewControllers] objectAtIndex:0];
But what i am unclear about is how i can scroll the UITableView to the specific section. I tried
NSIndexPath *myPath = [NSIndexPath indexPathForRow:0 inSection:3];
[myViewController.ordersTableView scrollToRowAtIndexPath:myPath atScrollPosition:UITableViewScrollPositionTop animated:NO];
Assuming of course, that the second view has been loaded, and has a section 3.
And lastly, my first view controller calls the above code that resides in the app delegate.
Thank you.
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您需要小心放置
scrollToRowAtIndexPath调用的位置。如果你把它放在视图加载之前，它可能会在 nil 上运行该方法。我想说的是myViewController中有一个名为scrollToRowAtIndexPath:的函数，它确定视图当前是否显示，如果是，则只调用 tableView 版本。如果没有，请保存indexPath，直到调用viewWillAppear:并运行它。You need to be careful where you put that
scrollToRowAtIndexPathcall. If you put it before the view loads, it may be running that method on nil. I would say have a function inmyViewControllercalledscrollToRowAtIndexPath:which determines if the view is currently displayed, and if it is, just calls the tableView version. If not, save the indexPath untilviewWillAppear:is called and run it then.