iOS problem with variable wrong assignment

ListView.h
//Variabili
	int TAG;
	int PassTag;
	
}

- (void) listener:(id) sender;
- (int) varID;

ListView.m
- (void) listener:(id) sender
{
.....
 	TAG = [[co id] intValue];
	[self varID];
....
	[detailArg release];
}

- (int) varID
{
	// PassTag = 1;   WORK
	PassTag = TAG;  // NOT WORK
	NSLog(@"Tag = %d",PassTag);	
	return PassTag;
}

controller2.m
ListView *my_ID = [[ListView alloc] init];
variabileID = [my_ID varID];
	
NSLog(@"VariabileID da lettura database = %d",variabileID);

TAG = [[co id] intValue];
[self varID];
NSLog(@"Listener PassTag = %d",PassTag);  // HERE THE TAG IS CORRECT //

#import "ListView.h"
#import "ContenutoObject.h"
#import "DataMaterie.h"


@implementation ListView
@synthesize detailArg;

- (void)viewDidLoad
{
	[VistaScroll setScrollEnabled:YES];
	[VistaScroll setContentSize:CGSizeMake(320,600)];
	[super viewDidLoad];
	[self createButtons];
}


- (void) createButtons
{
#define TAG_INDEX 1000
#define BUTTON_HEIGHT 100.0
#define X_GAP 40.0
#define Y_GAP 30.0


	DataMaterie *data = [[DataMaterie alloc] init];
	[data path];

	
	
	int count = 0;
	double y = Y_GAP;

	for ( ContenutoObject *co in data.array_contenuti )
  {
	double x = X_GAP + ( BUTTON_HEIGHT * ( count % 2 ) );
    if ( count && ( count % 2 ) == 0 ) y += BUTTON_HEIGHT + Y_GAP;
    if ( count % 2 ) x += X_GAP;

    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake( x, y, BUTTON_HEIGHT, BUTTON_HEIGHT );
    [button setTitle:co.Materia forState:UIControlStateNormal];
    [button addTarget:self action:@selector( listener: ) forControlEvents:UIControlEventTouchUpInside];
	button.tag = TAG_INDEX + count;
    [self.view addSubview:button];
    ++count;
	  

  }

	NSLog(@"Loop bottoni Materie OK");
}



- (void) listener:(id) sender
{
  int index = [sender tag] - TAG_INDEX;

	DataMaterie *data = [[DataMaterie alloc] init];	
	[data path];
	ContenutoObject *co = [data.array_contenuti objectAtIndex:index];

	TAG = [[co id] intValue];
	[self varID];
	NSLog(@"Listener PassTag = %d",PassTag);  // HERE THE TAG IS CORRECT //




	// Push view controller as appropriate
	detailArg = [[ArgomentiController alloc] initWithNibName:@"ListaArgomento" bundle:[NSBundle mainBundle]];
	[self.navigationController pushViewController:detailArg animated:YES];

	// Set the title of the view to the argoment
	self.detailArg.title = [co Materia];


	[detailArg release];

}

- (int) varID
{
	PassTag = 1;
	NSLog(@"PassTag = %d",PassTag);
	return PassTag;

}


- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
    [super dealloc];
}

@end

#import "DataArgomenti.h"
#import "iIngAppDelegate.h"
#import "ContenutoObjectArgomento.h"
#import "ArgomentiController.h"
#import "ListView.h"

@implementation DataArgomenti
@synthesize arrayArgomenti;

-(void) path {
	
	// Override point for customization after application launch.
	// Setup some globals
	databaseName = @"ARGOMENTI.sqlite";
	
	// Get the path to the documents directory and append the databaseName
	NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	NSString *documentsDir = [documentPaths objectAtIndex:0];
	databasePath = [documentsDir stringByAppendingPathComponent:databaseName];
	
	// Execute the "checkAndCreateDatabase" function
	[self checkAndCreateDatabase];
	// Execute the "readArgFromDatabaseMaterie" function
	[self readArgFromDatabaseArgomenti];	
	
}

-(void) checkAndCreateDatabase {
	// Check if the SQL database has already been saved to the users phone, if not then copy it over
	BOOL success;
	
	// Create a FileManager object, we will use this to check the status
	// of the database and to copy it over if required
	NSFileManager *fileManager = [NSFileManager defaultManager];
	
	// Check if the database has already been created in the users filesystem
	success = [fileManager fileExistsAtPath:databasePath];
	
	// If the database already exists then return without doing anything
	if(success) return;
	
	// If not then proceed to copy the database from the application to the users filesystem
	
	// Get the path to the database in the application package
	NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];
	
	// Copy the database from the package to the users filesystem
	[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
	
	[fileManager release];
}



-(void) readArgFromDatabaseArgomenti {

	ListView *my_ID = [[ListView alloc] init];
	variabileID = [my_ID varID];
	
	NSLog(@"VariabileID da lettura database = %d",variabileID);
	
	
	// Setup the database object
	sqlite3 *database;
	// Init the argoments Array
	arrayArgomenti = [[NSMutableArray alloc] init];
	
	// Open the database from the users filessytem
	if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
		// Setup the SQL Statement and compile it for faster access
		const char *sqlStatement = [[NSString stringWithFormat:@"select * from ARGOMENTO WHERE id_materia='%d'",variabileID] UTF8String];
		// const char *sqlStatement = "select * from ARGOMENTO";
		sqlite3_stmt *compiledStatement;
		if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) {
			// Loop through the results and add them to the feeds array
			while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
				// Read the data from the result row
				NSString *aID = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)];
				NSString *aIDMateria = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)];
				NSString *aDescArgomento = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 2)];
				
				// Create a new argoments object with the data from the database
				ContenutoObjectArgomento *contenutoArgomento = [[ContenutoObjectArgomento alloc] initWithName:aID idMateria:aIDMateria descArgmento:aDescArgomento];
				[arrayArgomenti addObject:contenutoArgomento];
				
				[contenutoArgomento release];
			}
		}
		
		
		// Release the compiled statement from memory
		sqlite3_finalize(compiledStatement);
		
	}
	sqlite3_close(database);
	
}


- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    
    // Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}


- (void)dealloc {
	[arrayArgomenti release];
    [super dealloc];
}


@end

dataArg.h
ListView *ListController;
dataArg.m
variabileID = [ListController varID];
NSLog(@"VariabileID da lettura database = %d",variabileID);