Changing DetailViewController on btn click in Root

问题:

I am porting my App from iOS3.2 to iOS6. On iPad, I use the SplitViewController.

In the RootViewController, I have got a table view. If the user clicks on a row in the table view, I change the DetailViewController.

The code doing this is:

   - (void)setDetailViewAuthorPage { 

UISplitViewController *splitViewController = 
(UISplitViewController *)self.parentViewController.parentViewController;

UIViewController *detail = 
[splitViewController.viewControllers objectAtIndex:1];

DetailViewControllerAuthorPageiPad <SubstitutableDetailViewController> 
*detailViewController = 
[[DetailViewControllerAuthorPageiPad alloc] 
 initWithNibName:@"DetailViewControllerAuthorPageiPad" 
 bundle:nil];

NSArray *viewControllers = 
[[NSArray alloc] 
 initWithObjects:self.navigationController, 
 detailViewController, 
 nil];

splitViewController.viewControllers = viewControllers;

[detailViewController viewWillAppear:YES];

[viewControllers release];

// Dismiss the popover if it's present.
if (popoverController != nil) {
    [popoverController dismissPopoverAnimated:YES];
}

[detailViewController 
 showRootPopoverButtonItem:self.rootPopoverButtonItem
 root:self];

In the landscape orientation, this code works fine.

In the portrait orientation, the DetailViewController is not changed. The row gets selected and the code above is running but no DetailViewController change can be seen. (I am using the Xcode 4.5)

You help is much appreciated!

Thank you.

回答1:

A couple of things that I see that you might want to look at: 1) Why aren't you using didSelectRowAtIndexPath instead of this custom method? 2) It appears you are calling a release on your viewControllers... ARC eliminates the need for releasing. 3) in the first line you have "self.parentViewController.parentViewController" ??? 4) You are using an init with nib... why not use storyboard and segues? I bring some of these up because I am finishing up the same kind of project... moving an app that was originally written for iOS3 to iOS6. I have practically had to rewrite the entire app because that much has changed.