cannot follow that tutorial - objective-c

Question

i tried to follow this tutorial:
http://www.youtube.com/watch?v=L-FK1TrpUng&feature=related
around 00:39:00.
Theres a counter which recognizes every switch to the second view controller and counts it.
The number of view switches should be shown on the second view controller.
But it doesn't work, thats the code:
Test2ViewController.h
#interface Test2ViewController : UIViewController <UITextFieldDelegate> {
UINavigationController *navController;
Test21ViewController *test21View;
NSString *text;
IBOutlet UITextField *textField1;
}
#property(nonatomic, retain) UITextField *textField1;
#property (nonatomic, retain) UINavigationController *navController;
#property (copy) NSString *text;
-(IBAction)pushViewController:(id)sender;
#end
Test2ViewController.m:
#import "Test2ViewController.h"
#import "Test21ViewController.h"
#implementation Test2ViewController
#synthesize textField1, navController, text;
-(IBAction)pushViewController:(id)sender {
static int count = 1;
Test21ViewController *test21ViewController = [[Test21ViewController alloc] init];
[self.navigationController pushViewController:test21ViewController animated:YES];
test21ViewController.label = [NSString stringWithFormat:#"Pushed %d", count];
count++;
}
Test21ViewController.h:
#interface Test21ViewController : UIViewController {
UINavigationController *navController;
NSString *label;
IBOutlet UILabel *textLabel;
UITextField *tF1;
}
#property (copy) NSString *label;
#property (nonatomic, retain) UINavigationController *navController;
#property(nonatomic,retain)UITextField *tF1;
-(IBAction)feldeingabe:(id)Sender;
#end
Test21ViewController.m:
#implementation Test21ViewController
#synthesize label;
- (void)viewDidLoad {
textLabel.text = label;
}
Any ideas why it doesn't work?
Thanks in advance
Code for the second question:
static int count = 1;
Test2ViewController *test2ViewController;
test2ViewController.label = [NSString stringWithFormat:#"Pushed %d !!!!!", count];
[[self navigationController] popViewControllerAnimated:NO];
count++;
CURRENT CODE:
#import "Test21ViewController.h"
#implementation Test21ViewController
#synthesize navController, text, parentView;
-(IBAction)pushViewController2:(id)sender {
Test2ViewController *test2ViewController;
static int count = 1;
test2ViewController.parentView = self;
test2ViewController.label = [NSString stringWithFormat:#"Pushed %d !!!!!", count];
[self.navigationController pushViewController:test2ViewController animated:YES]; count++;
}

Answer 1

For the second problem (passing a string from child to parent);
Test2ViewController.h
#interface Test2ViewController : UIViewController <UITextFieldDelegate> {
NSString *receiverPropertyFromChild;
}
#property(nonatomic, retain) NSString *receiverPropertyFromChild;
Test2ViewController.m:
-(IBAction)pushViewController:(id)sender {
static int count = 1;
Test21ViewController *test21ViewController = [[Test21ViewController alloc] init];
test21ViewController.label = [NSString stringWithFormat:#"Pushed %d", count];
test21ViewController.parentView = self;
[self.navigationController pushViewController:test21ViewController animated:YES];
count++;
}
Test21ViewController.h:
#class Test2ViewController;
#interface Test21ViewController : UIViewController {
Test2ViewController *parentView;
}
#property (nonatomic, assign) Test2ViewController *parentView;
Test21ViewController.m
-(IBAction)goToTest2ViewController:(id)sender {
parentView.receiverPropertyFromChild = #"the text you want to pass";
[self.navigationController popViewControllerAnimated:YES];
count++;
}

Answer 2

can you try:
Test21ViewController *test21ViewController = [[Test21ViewController alloc] init];
test21ViewController.label = [NSString stringWithFormat:#"Pushed %d", count];
[self.navigationController pushViewController:test21ViewController animated:YES];
I swapped the last two lines. It could be that you are setting the label after viewDidLoad has already been called, thus not setting the value in the label.
That said, it is better to pass the string as an init parameter, not as a property and then set in viewDidLoad.
edit:
To set it as init parameter, you need to create a new init method to accept that parameter.
- (id) initWithString:(NSString *)labelParam {
self = [super init];
if (self) {
this.label = labelParam;
}
return self;
}