想要在用户点击完成后调用showsViewController中的方法 [英] want to call a method in the presentingViewController after user has clicked done

问题描述

Noobie iOS开发人员在这里采用了iOS应用程序。

Noobie iOS developer with an adopted iOS app here.

我有一个iOS应用程序的设置部分，当用户点击完成时，我想要模态视图控制器（它目前正在做）我想在presentViewController中调用一个名为updateMainUI的函数。

I have a settings piece of an iOS app and when the user clicks done, I want the modal view controller (which it currently does) and I want to call a function called updateMainUI in the presentingViewController.

这是我打电话的方法：

- (void)done:(id)sender
{
  [[self presentingViewController] dismissViewControllerAnimated:YES completion:nil]; // works 
  [[self presentingViewController updateMainUI]; //doesn't work

但我收到以下错误：

No visible @interface for 'UIViewController' declares the selector 'updateMainUI'

但我已在演示控制器中声明了这一点

But I have declared this in the presenting controller

@interface LocationsViewController : UITableViewController <CLLocationManagerDelegate, UISearchBarDelegate, UISearchDisplayDelegate>
-(void)updateMainUI;

但是当呈现控制器是UITableViewController时，错误应该是关于UIViewController的奇怪。

But it's odd that the error should be about UIViewController when the presenting controller is a UITableViewController.

有关如何使updateMainUI正常工作的任何想法？我做错了什么？

Any ideas on how to get the updateMainUI working? And what I'm doing wrong?

thx

编辑＃1
这就是我创建这个的方法 - 任何想法如何引用* nearbyViewController？

edit #1 This is how I'm creating this - any idea how to get a refernce to the *nearbyViewController?

UIViewController *nearbyViewController = [[LocationsViewController alloc] initWithNearbyLocations];
UINavigationController *nearbyNavigationController = [[UINavigationController alloc] initWithRootViewController:nearbyViewController];
...
self.tabBarController = [[UITabBarController alloc] init];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:nearbyNavigationController, browseNavigationController, eventsNavigationController, nil];

推荐答案

解雇后 self ，你应该期望 self.presentingViewController 成为 nil 。在解雇之前尝试调用 updateMainUI 。

After dismissing ones self, you should expect self.presentingViewController to become nil. Try calling updateMainUI just before dismissing.

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