UIViewController not passing data between views - ios

Question

I'm trying to pass some data between UIViewControllers in a storyboard. I have some code below to pass the data. Whne I log the string that i'm saving on the original screen it's fine, but when I go to the UIDetailViewController the go is returning (null). What's my issue??
Original View Controller:
-(void)tableView:(UITableView *) tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (tableView==_countryTableView) {
if (indexPath.section==0) {
AthleteDataTransfer *dataTransfer = [[AthleteDataTransfer alloc] init];
dataTransfer.name=#"Yo";
dataTransfer.dob=#"01/01/2000";
dataTransfer.description=#"I am awesome";
dataTransfer.hometown=#"Launy";
NSLog(#"%#", dataTransfer.name);
[self performSegueWithIdentifier:#"showDetail" sender:self];
}
}
}
Detail View Controller:
AthleteDataTransfer *dataTransfer = [[AthleteDataTransfer alloc] init];
_name.text=dataTransfer.name;
dataTransfer.dob=_dob.text;
dataTransfer.description=_description.text;
dataTransfer.hometown=_hometown.text;
NSLog(#"%#", dataTransfer.name);

Answer 1

Insted of passing data in tableViews didSelectRowAtIndexPath, pass the data in prepareForSegue method.
Like this:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"showDetail"]) {
AthleteDataTransfer *dataTransfer = (AthleteDataTransfer *)[segue destinationViewController];
dataTransfer.name=#"Yo";
dataTransfer.dob=#"01/01/2000";
dataTransfer.description=#"I am awesome";
dataTransfer.hometown=#"Launy";
}
}

Answer 2

You should use prepareForSegue method to accomplish this.
and if you have more than one segues from this ViewController you can use segue.Identifier to distinguish
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if(segue.identifier==#"yoursegueidentitifer")
{
DetailedViewController *detailController = [segue destinationViewController];
detailController.nameoftextview.text =self.textViewName.text;
}
}

Answer 3

As suggested in other answers out here you should pass data in the prepareForSegue method. I'am not going to repeat the same code here. I wanted point out one thing that you dont want to create the DetailViewController again in the detailViewController like below
AthleteDataTransfer *dataTransfer = [[AthleteDataTransfer alloc] init]; // This is wrong and not required at all
NSLog(#"%#", dataTransfer.name);
Instead you should use self to refer the current controller
NSLog(#"%#", self.name); // This would be enough

Answer 4

For posting the text data to your destination View Controller, you can use the prepareForSegue method like this.
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
DestinationViewController *destController = [segue destinationViewController];
destController._yourTextView.text == _yourText.text;
}
}
Here, DesctinationViewController is the controller to which you want to pass the values and in the next step, you assign the values by using its object and the properties declared on that controller.
Since you are using performSegueWithIdentifier, this will automatically call prepareForSegue after performSegueWithIdentifier is executed which will show up your destination View Controller.