xml parsing consumes time need efficent way on iphone - iphone

Question

How to call main thread ??? i can parse but i cant display data
- (void)viewDidLoad {
//self.navigationItem.rightBarButtonItem = self.editButtonItem;
self.parentViewController.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"10.png"]];
[super viewDidLoad];
[NSThread detachNewThreadSelector:#selector(startTheBackgroundJob) toTarget:self withObject:nil];
}
- (void)startTheBackgroundJob {
NSUserDefaults *getida = [NSUserDefaults standardUserDefaults];
myIDa = [getida stringForKey:#"AppID"];
NSLog(#"#BOOK MARK ");
NSString *ubook = [[NSString alloc] initWithFormat:#"http://www.wapp=%#&action=show",myIDa];
NSLog(#" bookmark %#",ubook);
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
//NSString *outputString = [[NSString stringWithString:usearch] stringByAppendingString: UserText];
ubook = [ubook stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSLog(#"My string is now = %#", ubook);
NSURL *url = [[[NSURL alloc] initWithString:ubook]autorelease];
//NSURL *url= [NSURL URLWithString:outputString];
NSLog(#" bookmark URL IS %#",url);
NSXMLParser *xmlParser = [[[NSXMLParser alloc] initWithContentsOfURL:url] autorelease];
//Initialize the delegate.
XMLParserbookm *parser = [[[XMLParserbookm alloc] initXMLParser]autorelease];
//Set delegate
[xmlParser setDelegate:parser];
//Start parsing the XML file.
BOOL success = [xmlParser parse];
if(success)
{
NSLog(#" xml parsed suucess");
//[super viewDidLoad];
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
//[self searchTableView];
//mytimer4=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(wipe) userInfo:nil repeats:NO];
}
else{
NSLog(#"eeror");
}
[NSThread sleepForTimeInterval:3];
[self performSelectorOnMainThread:#selector(makeMyProgressBarMoving) withObject:nil waitUntilDone:NO]; // HOW TO CALL MAIN THREAD
[pool release]
}

Answer 1

You can try with
viewDidAppear:, this method is called after you go to a new view. Then at least, you can switch to new view, you should make sure that there is something on the screen in waiting for the xml parsing
Using Thread: You put parsing into another thread and then callback your main thread after you finish, then there will be no block at all