Passing data between two viewcontrollers in xcode using storyboard - objective-c

Question

I am super new to programming in general. I am trying to make a very simple app.
I am trying to pass data from one viewcontroller to another using a storyboard. On my first screen I have a text field and a button then after you press the button i want the second screen's label to be updated with whatever text you put in the text field.
Here is some of my code:
#import "FirstViewController.h"
#import "SecondViewController.h"
#interface FirstViewController ()
#end
#implementation FirstViewController
#synthesize secondviewData;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (IBAction)passData:(UIButton *)sender {
// SecondViewController *second = [[SecondViewController alloc] initWithNibName:nil bundle:nil];
self.secondviewData = secondviewData;
secondviewData.passedValue = input.text;
// [self presentViewController:second animated:YES completion:nil];
homeLabel.text = input.text;
}
#end
#import "SecondViewController.h"
#import "FirstViewController.h"
#interface SecondViewController ()
#end
#implementation SecondViewController
#synthesize passedValue;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
label.text = passedValue;
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
Here's a link to my code: http://oberober.com/passingData/
So far the label on the second screen keeps going blank no matter what I enter on the first screen's text field.
I feel like I am missing an important concept? Any tips or tutorials I can look at?
Thanks ahead of time,
Casper

Answer 1

You pass the data by using the prepareForSegue method of the first controller. Here's an example from one of my apps that shows a vehicle object being passed to the second controller.
CHRBodyViewController is the class of the second controller.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
CHRBodyViewController *body = [segue destinationViewController];
body.vehicle = _vehicle;
body.updated = YES;
}