Question

I have a UITableViewController which pushes a UIViewController and I need to pass two NSDates and a BOOL from that child view controller back to the table view controller.

How could I do this? Let me know if I am not being clear or you need more explanation.

I’d appreciate any help, thanks.

Answer 1

Using a delegate is the proper way of passing info from one controller to another.

Generally, what you want to do is to declare a protocol in your UITableViewController header, implement it, and then init the UIViewController with a delegate.

In a nutshell, your UITableViewController .h file should have something like this:

@protocol setDateDelegate <NSObject>
@required
- (void) setDateOne:(NSDate *)one dateTwo:(NSDate *)two;
@end

Then, you ought to implement the above mentioned class doing whatever you want to do with the dates in your UITableViewController .m file.

In your UIViewController, you could (alternative at the end) define a custom init method:

First, define a delegate property in your .h, and a custom init method, then implement it in your .m with something like this:

- (id)initWithDelegate:(NSObject *)myDelegate
{

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

Next, when you need to pass the dates to your UITableViewController, just use
[self.delegate setDateOne:one dateTwo:two];

There are more ways of doing this, including skipping the custom init method and just setting the delegate after you create a UIViewController:

MyUIViewController *viewController = [[[MyUIViewController alloc] init] autorelease];
viewController.delegate = self;
...

It’s more of a personal preference style.

I’ve probably messed up the code (and forgotten a few bits) because I’m writing this off the top of my head, but it should be good enough to get you started.