How to show alertview indicator before pulling json data( iOS6 ) - ios

Question

Could any one please help me with this code i'm trying to call alertview indicator before pulling json data in my iOS app but i don't know how to check if the data already loaded and then disappear the alertview indicator, For now it always appears even all data aleady loaded. here is my code:
//
// Firstcine.m
//
//
//
//
#import "Firstcine.h"
#interface Firstcine (){
UIAlertView *loading;
}
#end
#implementation Firstcine
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Loading Show Alert View...
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];
// dis play all data after first loaded
NSURL *url = [NSURL URLWithString:#"http://localhost/App/first.php"];
NSData *jsonData = [NSData dataWithContentsOfURL:url];
NSArray *json = [NSJSONSerialization JSONObjectWithData:
jsonData options:NSJSONReadingAllowFragments error:nil];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:#"bg_tile.png"]];
NSDictionary *dict = [json objectAtIndex:0];
name.text = [dict valueForKey:#"name"];
time.text = [dict valueForKey:#"time"];
date.text = [dict valueForKey:#"date"];
price.text = [dict valueForKey:#"price"];
// then display photo
UIImageView *image = [[UIImageView alloc]initWithFrame:CGRectMake(75, 87, 150,200)];
image.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:
[NSURL URLWithString:[dict valueForKey:#"photo" ]]]];
[self.view addSubview:image];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end

Answer 1

Have you tried something like this
UIAlertView *alertView = [[UIAlertView alloc]
initWithTitle:#"Configuring Preferences\nPlease Wait..."
message:nil
delegate:nil
cancelButtonTitle:nil
otherButtonTitles:nil];
[alertView show];
UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
indicator.center = CGPointMake(alertView.bounds.size.width / 2, alertView.bounds.size.height - 50);
[indicator startAnimating];
[alertView addSubview:indicator];
dispatch_queue_t downloadQueue = dispatch_queue_create("saver", NULL);
dispatch_async(downloadQueue, ^{
// do some heavy lifting ? like a fetch
dispatch_async(dispatch_get_main_queue(), ^{
// hide the view
[alertView dismissWithClickedButtonIndex:0 animated:YES];
});
});