iOS - ช่วยด้วยครับ มีปัญหาการอ่านข้อมูล JSON จากเว็บมาแสดงใน Table View

#import "Timeline.h"
#import "CustomCell.h"
#import "DetailTimeline.h"

@interface Timeline ()
{
    NSMutableArray *myObject;
    
    // A dictionary object
    NSDictionary *dict;
    
    // Define keys
    NSString *idpost;
    NSString *detail;
    NSString *parameter;
    NSString *result;
    NSString *imgpost;
    NSString *timestamp;
    
    UIAlertView *loading;
}

@end

@implementation Timeline
@synthesize receivedData,myTableView;

- (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.
    
    self.myTableView.dataSource = self;
    self.myTableView.delegate = self;
    
    // Define keys
    idpost = @"IDpost";
    detail = @"Detail";
    parameter = @"Parameter";
    result = @"Result";
    imgpost = @"Imgpost";
    timestamp = @"Timestamp";
    
    // Create array to hold dictionaries
    myObject = [[NSMutableArray alloc] init];
    
    NSURLRequest *theRequest =
    [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://waterservice.net78.net/Timelineuser.php"]
                     cachePolicy:NSURLRequestReloadIgnoringLocalCacheData
                 timeoutInterval:10.0];
    
    NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    
    
    // Loading...
    [UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
    
    loading = [[UIAlertView alloc] initWithTitle:@"" message:@"กรุณารอ" delegate:nil cancelButtonTitle:nil otherButtonTitles:nil];
    UIActivityIndicatorView *progress= [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(125, 50, 30, 30)];
    progress.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge;
    [loading addSubview:progress];
    [progress startAnimating];
    [progress release];
    [loading show];
    
    if (theConnection) {
        self.receivedData = [[NSMutableData data] retain];
    } else {
        UIAlertView *connectFailMessage = [[UIAlertView alloc] initWithTitle:@"NSURLConnection " message:@"Failed in viewDidLoad"  delegate: self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
        [connectFailMessage show];
        [connectFailMessage release];
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    [receivedData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    sleep(4);
    [receivedData appendData:data];
}

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

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    
    [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
    [loading dismissWithClickedButtonIndex:0 animated:YES];
    
    if(receivedData)
    {
        id jsonObjects = [NSJSONSerialization JSONObjectWithData:receivedData options:NSJSONReadingMutableContainers error:nil];
        
        // values in foreach loop
        for (NSDictionary *dataDict in jsonObjects) {
            NSString *strIDpost = [dataDict objectForKey:@"IDpost"];
            NSString *strDetail = [dataDict objectForKey:@"Detail"];
            NSString *strParameter = [dataDict objectForKey:@"Parameter"];
            NSString *strResult = [dataDict objectForKey:@"Result"];
            NSString *strImgpost = [dataDict objectForKey:@"Imgpost"];
            NSString *strTimestamp = [dataDict objectForKey:@"Timestamp"];
            NSLog(@"%@", strIDpost);
            NSLog(@"%@", strDetail);
            NSLog(@"%@", strParameter);
            
            dict = [NSDictionary dictionaryWithObjectsAndKeys:
                    strIDpost, idpost,
                    strDetail, detail,
                    strParameter, parameter,
                    strResult, result,
                    strImgpost, imgpost,
                    strTimestamp, timestamp,
                    nil];
            [myObject addObject:dict];
        }
        [myTableView reloadData];
    }
    
    // release the connection, and the data object
    [connection release];
    [receivedData release];
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (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";
    
    CustomCell *Cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (!Cell) {
        // Use the default cell style.
        Cell = [[CustomCell alloc] initWithStyle : UITableViewCellStyleDefault
                                       reuseIdentifier : CellIdentifier];
    }

    int nbCount = [myObject count];
    if (nbCount ==0)
        Cell.lblResult.text = @"กำลังโหลด.......................";
    else
    {
        NSDictionary *tmpDict = [myObject objectAtIndex:indexPath.row];
        
        NSURL *url = [NSURL URLWithString:[tmpDict objectForKey:imgpost]];
        NSData *data = [NSData dataWithContentsOfURL:url];
        UIImage *img = [[UIImage alloc] initWithData:data];
        
        Cell.imgTimeline.image = img;

        Cell.lblDetail.text =  [NSString stringWithFormat:@"%@",[tmpDict objectForKey:detail]];
        Cell.lblParameter.text = [NSString stringWithFormat:@"%@",[tmpDict objectForKey:parameter]];
        Cell.lblResult.text =  [NSString stringWithFormat:@"%@",[tmpDict objectForKey:result]];
        Cell.lblTimestamp.text = [NSString stringWithFormat:@"%@",[tmpDict objectForKey:timestamp]];

    }
    return Cell;
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    
    if ([[segue identifier] isEqualToString:@"showDetail"]) {
        
        NSIndexPath *indexPath = [self.myTableView indexPathForSelectedRow];
        
        NSDictionary *tmpDict = [myObject objectAtIndex:indexPath.row];
        
        [[segue destinationViewController] setImgItem:[tmpDict objectForKey:imgpost]];
        [[segue destinationViewController] setNameItem:[tmpDict objectForKey:detail]];
        [[segue destinationViewController] setResultItem:[tmpDict objectForKey:result]];
        [[segue destinationViewController] setMeterItem:[tmpDict objectForKey:parameter]];
        [[segue destinationViewController] setTimeItem:[tmpDict objectForKey:timestamp]];
    }
    
}

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

- (void)dealloc {
    [myTableView release];
    [super dealloc];
}
@end