使用UISegmentedControl切换viewController

Question

I'm trying to implement the code described in this tutorial to switch UIViewController s using an UISegmentedControl . The tutorial uses didFinishLaunchingWithOptions: to set everything up and show the first view:

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

    NSArray * viewControllers = [self segmentViewControllers];

    UINavigationController * navigationController = [[UINavigationController alloc] init];
    self.segmentsController = [[SegmentsController alloc] initWithNavigationController:navigationController viewControllers:viewControllers];

    self.segmentedControl = [[UISegmentedControl alloc] initWithItems:[viewControllers arrayByPerformingSelector:@selector(title)]];

    [self.segmentedControl addTarget:self.segmentsController
                          action:@selector(indexDidChangeForSegmentedControl:)
                forControlEvents:UIControlEventValueChanged];

    [self firstUserExperience];

    [window addSubview:navigationController.view];
    [window makeKeyAndVisible];

    return YES;
}

However, in my app, I'd like to call this from didSelectRowAtIndexPath: inside a UITableViewController , but I'm not sure how to do that. So the user selects a row, and a new view appears where I can switch between views using a UISegmentedControl at the top.

I guess the line that needs to change is [window addSubview:navigationController.view]; , all the rest can be the same.

What would be the equivalent if I call that code from my UITableViewController instead of from the AppDelegate as in the tutorial ?

(This is not a duplicate of Switching ViewControllers with UISegmentedControl in iOS5 , since I'd like to use the example from the tutorial and that question deals with how to set it up using storyboards.)

Answer 1

While I don't think this is a nice solution (I would prefer creating a separate view controller, with the segmented control, and implement the switching logic there), the answer is yes : you can call this piece of code from your table view controller, adding the navigation controller's view as its subview, like so:

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

    NSArray * viewControllers = [self segmentViewControllers];

    UINavigationController * navigationController = [[UINavigationController alloc] init];
    self.segmentsController = [[SegmentsController alloc] initWithNavigationController:navigationController viewControllers:viewControllers];

    self.segmentedControl = [[UISegmentedControl alloc] initWithItems:[viewControllers arrayByPerformingSelector:@selector(title)]];
    self.segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;

    [self.segmentedControl addTarget:self.segmentsController
                              action:@selector(indexDidChangeForSegmentedControl:)
                    forControlEvents:UIControlEventValueChanged];
    [self firstUserExperience];
    [self.view addSubview:navigationController.view];

}

I have downloaded the example you referred to (quite outdated by the way), and included it in a sample project. so you can check it out. All you need to do is add a new item, then select a row to invoke the relevant code piece.

Check the code here

UPDATE:

I have added a second example which uses a separate view controller, check it out if you want: Link

Answer 2

Use the container view controller. The tutorial you're referring to was a hack used prior to container view controllers. The author should really pull that thing down.