MActivityIndicator.h

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>

/*@protocol MActivityIndicatorProtocol

- (void)handleTask:(SEL)task;
- (void)hideIndicator;

@end*/


@interface MActivityIndicator : UIView {
	BOOL shown;
	UIWindow *_window;
	UILabel *textLabel;
	UIActivityIndicatorView *indicatorView;
}

@property (nonatomic, retain) UILabel *textLabel;
@property (nonatomic, retain) UIActivityIndicatorView *indicatorView;

- (id)initWithWindow:(UIWindow *)aWindow;
- (void)loadTextLabel;
- (void)loadIndicatorView;

- (void)showIndicator;
- (void)hideIndicator;

@end

MActivityIndicator.m

#import "MActivityIndicator.h"
#import <QuartzCore/QuartzCore.h>

#define WIDTH	80
#define HEIGHT  80

@implementation MActivityIndicator

@synthesize textLabel,indicatorView;


- (id)initWithWindow:(UIWindow *)aWindow
{
	self = [super initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT)];
	
	if (self)
	{		
		shown = NO;
		
		_window = aWindow;
		
		self.center = CGPointMake(_window.bounds.size.width / 2, _window.bounds.size.height / 2);
		self.clipsToBounds = YES;
		self.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.9];
		self.alpha = 0.7;
		self.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin |
		UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleBottomMargin;
		
		if ([self.layer respondsToSelector:@selector(setCornerRadius:)]) {
			[(id) self.layer setCornerRadius:10];
		}
		
		[self loadTextLabel];		
		[self loadIndicatorView];
		
		[self showIndicator];
	}
	
	return self;
}


- (void)loadTextLabel
{
	textLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, WIDTH, HEIGHT/2)];
	textLabel.textColor = [UIColor whiteColor];
	textLabel.textAlignment = UITextAlignmentCenter;
	textLabel.backgroundColor = [UIColor clearColor];
	textLabel.font = [UIFont boldSystemFontOfSize:[UIFont smallSystemFontSize]];
	[self addSubview: textLabel];	
}


- (void)loadIndicatorView
{
	indicatorView = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 32, 32)];
	indicatorView.center = CGPointMake(self.bounds.size.width/2, self.bounds.size.height/2);	
	[indicatorView setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhiteLarge];
	[indicatorView startAnimating];
	[self addSubview:indicatorView];	
}

-(void) showIndicator
{
	if (!shown) 
	{
		shown = YES;
		[_window addSubview:self];
	}
}

-(void) hideIndicator
{
	if (shown) 
	{
		shown = NO;
		[self removeFromSuperview];
	}
}



/*
 -(void)touchesBegan: (NSSet *)touches withEvent:(UIEvent *)event
 {
    [self hide];
 }
*/

- (void)dealloc
{
	[_window release];
	[indicatorView release];
	[textLabel release];
	[super dealloc];
}

@end