Fetching data in background, but table view not updating - iphone

Question

I want to switch to next view immediately using push view controller, so using below method to fetch data from web services. But this is not updating UITableView.
// vewDidLoad
[NSThread detachNewThreadSelector:#selector(setImage) toTarget:self withObject:nil];
-(void)setImage
{
if([type isEqualToString:#"Organisation"])
{
self.mGetDataDict = [MyEventApi members:self.mUserIdDict];
self.mRecievedDataDict = [self.mGetDataDict valueForKey:#"members"];
}
if([type isEqualToString:#"Individual"]){
self.mGetDataDict = [MyEventApi friends:self.mUserIdDict];
self.mRecievedDataDict = [self.mGetDataDict valueForKey:#"friends"];
}
if([self.mGetDataDict valueForKey:#"friends"] == [NSNull null])
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:#"alert" message:#"You have not added any friend yet." delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
}
else
{
self.mFrndNameArr = [[NSMutableArray alloc]init];
self.mFrndImgArr = [[NSMutableArray alloc]init];
self.mFirstNameArr = [[NSMutableArray alloc]init];
self.mLastNameArr = [[NSMutableArray alloc]init];
self.mFrndIdArr = [[NSMutableArray alloc]init];
self.mFrndMSinceArr = [[NSMutableArray alloc]init];
self.mFrndDescArr = [[NSMutableArray alloc]init];
self.mFrndNameArr = [self.mRecievedDataDict valueForKey:#"username"];
self.mFrndImgArr = [self.mRecievedDataDict valueForKey:#"image"];
self.mFirstNameArr = [self.mRecievedDataDict valueForKey:#"firstName"];
self.mLastNameArr = [self.mRecievedDataDict valueForKey:#"lastName"];
self.mFrndIdArr = [self.mRecievedDataDict valueForKey:#"id"];
self.mFrndMSinceArr = [self.mRecievedDataDict valueForKey:#"memberSince"];
self.mFrndDescArr = [self.mRecievedDataDict valueForKey:#"description"];
[self.mFriendsTable reloadData];
}
}
Below is cellForRowAtIndexPath method.
-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell;
cell = [self.mFriendsTable dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
else{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
NSString *imageUrlString = [NSString stringWithFormat:#"http://www.myevent.co/%#", [self.mFrndImgArr objectAtIndex:indexPath.row]];
[imageUrlString stringByReplacingOccurrencesOfString:#"/" withString:#""];
UILabel *lblEventName = [[UILabel alloc]initWithFrame:CGRectMake(92, 5, 200, 25)];
lblEventName.font = [UIFont fontWithName:#"Helvetica-Bold" size:14];
lblEventName.backgroundColor = [UIColor clearColor];
[cell.contentView addSubview:lblEventName];
if([copyArr count] >0)
{
lblEventName.text = [copyArr objectAtIndex:indexPath.row];
}
else{
lblEventName.text = [self.mFrndNameArr objectAtIndex:indexPath.row];
}
asyncImageView = [[AsyncImageView alloc]initWithFrame:CGRectMake(1, 3, 85, 54)];
[asyncImageView loadImageFromURL:[NSURL URLWithString:imageUrlString]];
[cell.contentView addSubview:asyncImageView];
cell.textLabel.backgroundColor = [UIColor colorWithRed:240.0/255.0 green:240.0/255.0 blue:240.0/255.0 alpha:1.0];
cell.contentView.backgroundColor = [UIColor colorWithRed:240.0/255.0 green:240.0/255.0 blue:240.0/255.0 alpha:1.0];
return cell;
}
The text data is fetched but images are not fetched until table scrolled. But if i use this way it shows the images also but switches to next view after all dat is fetched.
// vewDidLoad
[self setImage];
Please guide for above, is the way iam using threads wrong or any other way or method needs to be used here.

Answer 1

Since you are updating data in seperate thread ,You have to execute the reload on the main thread itself
instead of this
[self.mFriendsTable reloadData];
use this
[self.mFriendsTable performSelectorOnMainThread:#selector(reloadData) withObject:nil waitUntilDone:YES];