Question

I’m new in Objective-C and I’m start to work on app that will have a few View’s. I want to create them 100% programmatically without XIB files. I understand that I have to create my ViewControllers classes for my screens, but I want to ask you how to manage a navigation with it. Let’s say that I have one ViewController which contains a tableView. And i want to create a next screen. So I understand that row in tableViewController class calling

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

But what about next screen? I don’t have it yet. Should I create a “ready” ViewController class? How to handle a navigation in this case?

Answer 1

In your case, when a cell is selected, you would:

• Create a new instance of your next view controller,
• Push this new instance on the UINavigationController stack.

So, first, you need to ensure that your first view controller (the one with the table view) is contained in an UINavigationController.

// AppDelegate, in applicationDidFinishLanching:

UIViewController *firstViewController = [[[MyCustomTableViewController alloc]
                                          initWithNibName:nil bundle:nil]
                                         autorelease];
UINavigationController *navigationController = [[[UINavigationController alloc]
                                                 initWithRootViewController:firstViewController]
                                                autorelease];

[self.window setRootViewController:navigationController];

Then, when a cell in your table view is selected, you can write:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIViewController *nextViewController = [[[MyNextViewController alloc]
                                             initWithNibName:nil bundle:nil]
                                            autorelease];

    [self.navigationController pushViewController:nextViewController
                                         animated:YES]

}