UIUtilitiy

UIUtilitiy.h

#import <Foundation/Foundation.h>

@interface UIUtilitiy : NSObject

+ (void)showAlert: (NSString*)title text:(NSString*)text;
+ (void)showActivityIndicator:(UIViewController *)controller;
+ (void)hideActivityIndicator;
@end

UIUtilitiy.m

#import "UIUtilitiy.h"
#import "AppDelegate.h"

@implementation UIUtilitiy
static UIView *_indicatorView = nil;
+ (void)showAlert: (NSString*)title text:(NSString*)text {
    UIAlertView* alert = [[[UIAlertView alloc]
                           initWithTitle:title message:text delegate:nil
                           cancelButtonTitle:@"OK" otherButtonTitles:nil] autorelease];
    [alert show];
}

+ (void)showActivityIndicator:(UIViewController *) controller {
    if (!_indicatorView) {
        _indicatorView = [[UIView alloc]init];
        _indicatorView.backgroundColor = [UIColor colorWithHue:0 
                                                    saturation:1.0 
                                                    brightness:0.0 
                                                         alpha:0.1];
        _indicatorView.frame = CGRectMake(0, 0, 320.0, 480.0);
        UIActivityIndicatorView *activityIndicator = [[[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge]autorelease];
        activityIndicator.frame = CGRectMake(130.0, 180.0, 60.0, 60.0);
        activityIndicator.hidden = NO;
        [activityIndicator startAnimating];
        [_indicatorView addSubview:activityIndicator];
    }
    [_indicatorView removeFromSuperview];
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
    [controller.view addSubview:_indicatorView];
    [controller.view bringSubviewToFront:_indicatorView];
}

+ (void)hideActivityIndicator {
    [_indicatorView removeFromSuperview];
    [_indicatorView release], _indicatorView = nil;
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
}

@end