iOS - Run UITableView แล้วไม่ขึ้นข้อมูลอะไรออกมาเลย ช่วยด้วยครับ TT

//
//  ViewController.m
//  getDataFromServer
//
//  Created by Weerachai on 12/10/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import "showViewController.h"

@interface showViewController ()
{
    NSMutableArray *myObject;
    
    // A dictionary object
    NSDictionary *dict;
    
    // Define keys
    NSString *device_id;
    NSString *ip_address;
    NSString *mac_address;
    NSMutableData *receivedData;
    UIAlertView *loading;
}

@end

@implementation showViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    // Define keys
    device_id = @"device_id";
    ip_address = @"ip_address";
    mac_address = @"mac_address";
    
    // Create array to hold dictionaries
    myObject = [[NSMutableArray alloc] init];
    
    
    NSURLRequest *theRequest =
    [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://202.44.47.47/mac/show.php"]
                     cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                 timeoutInterval:10.0];
    
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    
    
    // Loading...
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    
    loading = [[UIAlertView alloc] initWithTitle:@"" message:@"Please Wait..." delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];
    UIActivityIndicatorView *progress= [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(125, 50, 30, 30)];
    progress.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
    [loading addSubview:progress];
    [progress startAnimating];
    [loading show];
    
    if (theConnection) {
        receivedData = nil;
    } else {
        UIAlertView *connectFailMessage = [[UIAlertView alloc] initWithTitle:@"NSURLConnection " message:@"Failed in viewDidLoad"  delegate: self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
        [connectFailMessage show];
        
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    receivedData = [[NSMutableData alloc] init];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    sleep(2);
    [receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    
    
    // inform the user
    UIAlertView *didFailWithErrorMessage = [[UIAlertView alloc] initWithTitle: @"NSURLConnection " message: @"didFailWithError"  delegate: self cancelButtonTitle: @"Ok" otherButtonTitles: nil];
    [didFailWithErrorMessage show];
    
    
    //inform the user
    NSLog(@"Connection failed! Error - %@", [error localizedDescription]);
    
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    [loading dismissWithClickedButtonIndex:0 animated:YES];
    
    if(receivedData)
    {
        //NSLog(@"%@",receivedData);
        //NSString *dataString = [[NSString alloc] initWithData:receivedData encoding:NSASCIIStringEncoding];
        //NSLog(@" abc = %@",dataString);
        
        id jsonObjects = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingMutableContainers error:nil];
        
        // values in foreach loop
        for (NSDictionary *dataDict in jsonObjects) {
            NSString *strdevice_id = [dataDict objectForKey:@"Device_id"];
            NSString *strip_address = [dataDict objectForKey:@"IP_Address"];
            NSString *strmac_address = [dataDict objectForKey:@"MAC_Address"];
            
            dict = [NSDictionary dictionaryWithObjectsAndKeys:
                    strdevice_id, device_id,
                    strip_address, ip_address,
                    strmac_address, mac_address,
                    nil];
            [myObject addObject:dict];
        }
        
        [myTable reloadData];
    }
    
    // release the connection, and the data object
    
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    
    int nbCount = [myObject count];
    if (nbCount == 0)
        return 1;
    else
        return [myObject count];
    
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    
    static NSString *CellIdentifier = @"Cell";
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        // Use the default cell style.
        cell = [[UITableViewCell alloc] initWithStyle : UITableViewCellStyleSubtitle
                                       reuseIdentifier : CellIdentifier];
    }
    
    int nbCount = [myObject count];
    if (nbCount ==0)
        cell.textLabel.text = @"Loading Data";
    else
    {
        NSDictionary *tmpDict = [myObject objectAtIndex:indexPath.row];
        
        // MemberID
        NSMutableString *text;
        text = [NSMutableString stringWithFormat:@"Device ID : %@",[tmpDict objectForKey:device_id]];
        
        // Name & Tel
        NSMutableString *detail;
        detail = [NSMutableString stringWithFormat:@"MAC : %@ , IP : %@"
                  ,[tmpDict objectForKey:mac_address]
                  ,[tmpDict objectForKey:ip_address]];
        
        cell.textLabel.text = text;
        cell.detailTextLabel.text= detail;
        
        //[tmpDict objectForKey:memberid]
        //[tmpDict objectForKey:name]
        //[tmpDict objectForKey:tel]
    }
    return cell;
}


- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end

//
//  showViewController.h
//  auten
//
//  Created by Peat-Mac on 11/14/2557 BE.
//  Copyright (c) 2557 Saringkhan Vungsin. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface showViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
{
    IBOutlet UITableView *myTable;
}
@end