iOS/iPhone Activity Indicator View and AlertView (UIAlertView / UIActivityIndicatorView)

    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];
    [progress release];
    [loading show];

    [loading dismissWithClickedButtonIndex:0 animated:YES];
    [loading release];

//
//  ViewController.h
//  UIAlertViewUIActivityIndicatorView
//
//  Created by Weerachai on 12/8/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController


- (IBAction)btnOpenPopup:(id)sender;

@end

//
//  ViewController.m
//  UIAlertViewUIActivityIndicatorView
//
//  Created by Weerachai on 12/8/55 BE.
//  Copyright (c) 2555 Weerachai. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()
{
    UIAlertView *loading;
}

@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (IBAction)btnOpenPopup:(id)sender {
    
    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];
    [progress release];
    [loading show];
    
    // for Hide 
    //[loading dismissWithClickedButtonIndex:0 animated:YES];
    //[loading release];
}

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


@end

    [loading dismissWithClickedButtonIndex:0 animated:YES];
    [loading release];