Question

I’m trying to load a specific UITableViewController as the Detail view of a UISplitViewController when the user selects a cell within the Master view; but having some problems. When i select the cell, it just shows a blank window with out a table view controller.

However if i change the App Delegate to just load the UITableView controller without using the UISplitViewController it works fine, so i know it’s a problem with the way i’ve coded the UISplitViewController.

The view hierachy:

UISplitViewController 
--> 
    UINavigationController 
    --> UITableViewController (DetailViewController)

    UINavigationController
    --> UIViewController (ColorViewController)

The user selects a cell in ColorViewController and that should change the DetailViewController.

In AppDelegate.m:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

self.viewController = [[ViewController alloc] init];

self.window.rootViewController = [self.viewController splitViewController];

[self.window makeKeyAndVisible];

return YES;

}

In ViewController.m:

- (UIViewController *) splitViewController {

// Create the navigation-run root view
ColorViewController *rootVC = [ColorViewController controller];

UINavigationController *rootNav = [[UINavigationController alloc] initWithRootViewController:rootVC];

// Create the navigation-run detail view
DetailViewController *detailVC = [DetailViewController controller];

UINavigationController *detailNav = [[UINavigationController alloc] initWithRootViewController:detailVC];

// Add both to the split view controller
svc = [[UISplitViewController alloc] init];

svc.viewControllers = [NSArray arrayWithObjects: rootNav, detailNav, nil];

svc.delegate = detailVC;

return svc;

}

In ColorViewController.m:

@interface ColorViewController : UITableViewController

...    

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

UIViewController *controller = (UIViewController *)self.splitViewController.delegate;

TableViewController *tvc = [[TableViewController alloc] init];

[controller.view addSubview:tvc.view];

}

What’s the best way to change the Detail view within a UISplitViewController? Should i just add the replacement view to UIViewController like above or is there a better way? Maybe that’s the cause of my problem?

Answer 1

I’m going to answer my own question..

For some reason, in the Master view (ColorViewController), the detail object TableViewController *tvc needs to be declared as an instance variable, not as a variable within a method.

After doing that, it works and displays the table properly.

I don’t really understand why though, if anyone would like to try to explain.

Cheers,