单击TabBarItem重新加载ViewController

Question

I'm kinda desperate right now :/ I have a Tab Bar Controller with 4 Items. In the 4. Tab I included a webView which shows a list of pdf's. If I open a PDF in the webView there is no way to go back to the main webView with the links. Is there a way by re-clicking the 4. TabBar to reload the View? If I change from the 3. to the 4. tabbar it works (viewWillAppear).

Someone told me, that the following method should work:

- (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController{
if ([viewController isKindOfClass:[UIColor class]]) {
    //Try this if you're pushing the webView in another ViewController
    [viewController.navigationController popToRootViewControllerAnimated:YES];
    //or access to your webView and call goBack();
}

}

but actually I have no idea in which file I should insert that method. (See print Screen)

Thanks a LOT in advance for your help guys!

Answer 1

1. Subclass UITabBarController

1.1. Cmd+N and create a new instance of NSObject class, and name it TabBarController

1.2. in TabBarController.h replace NSObject so that it reads @interface TabBarController : UITabBarController <UITabBarControllerDelegate>

1.3. in TabBarController.m add this:

- (id) init
{
  self = [super init];
  if (self) 
  {
    self.delegate = self;
  }
  return self;
}

1.4. and this

- (void)tabBarController:(UITabBarController *)tabBarController 
    didSelectViewController:(UIViewController *)viewController
{
  // Is this the view controller type you are interested in?
  if ([viewController isKindOfClass:[MehrViewController class]])
  {
    // call appropriate method on the class, e.g. updateView or reloadView
    [(MehrViewController *) viewController updateView];
  }
}

1.5. In IB, Inspection, change the class of Tab Bar Controller to your TabBarController (instead of UITabBarController )

1.6. You also need to include MehrViewController.h in TabBarController.m

---

Edit

in MehrViewController.m (as you posted in your question, assuming it has a webView)

 // An example of implementing reloadView - (void)reloadView { [self.webView reload]; }