Can't pass data

Are you sure that is a complete working code sample?

1. Why is (IBAction)menu not in the first header?

2. You are creating an instance of your ViewController class but not presenting it.

3. You do not specify a NIB name when instantiating ViewController. It appears you have added a label in the designer so the layout must be in some NIB or storyboard.

4. If you are using a storyboard with segues you should not be instantiating ViewController yourself. You should pass the data in prepareForSegue.

5. What Xcode version are you using? I notice viewcontrollerdata is both a public interface variable and a property, and you are manually synthesizing.

You answered #1 and 5. What about #2, 3, 4?

Simple example. I encourage you to create a new test project using the Single View Application template, with only this, to understand how it works. Then apply what you have learned to your real project.

ViewController: contains a label and a button.

SecondViewController: contains a label.

Modal segue between ViewController button and SecondViewController.

When SecondViewController appears, the label text will match the label text on ViewController.

Don't forget to assign the storyboard second view controller custom class in the identity inspector, and connect the label outlets on both view controllers.

// ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@property (weak, nonatomic) IBOutletUILabel *sourceLabel;

@end

// ViewController.m

#import "ViewController.h"

#import "SecondViewController.h"

@implementation ViewController

- (void)viewDidLoad

{

[superviewDidLoad];

self.sourceLabel.text = @"Hello";

}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

{

((SecondViewController *)(segue.destinationViewController)).labelText = self.sourceLabel.text;

}

@end

// SecondViewController.h

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController

@property (weak, nonatomic) IBOutletUILabel *destinationLabel;

@property NSString *labelText;

@end

// SecondViewController.m

#import "SecondViewController.h"

@implementation SecondViewController

- (void)viewDidLoad

{

[superviewDidLoad];

self.destinationLabel.text = self.labelText;

}

@end