iOS Problem with NSNotification in UIAlertView delegate

[anuhoho]

Hi

I have a peculiar problem where my NSNotification seems to die in UIAlertView delegate function

I have four options present in a UIAlertView and to handle them i used its delegate class so that at each options I can do some different task. One of those task is to send some data to the server. For that I am using asynchronous request and also I have a loading view popping up whenever user select the option of uploading the data . In the loading view i have a activityindicator scroller which keeps rotating. I close the loading view as soon as I get any response from the server. This i did with NSNotification. But the following code is not working

#pragma mark -
#pragma mark UIAlertViewDelegate methods

- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

if(buttonIndex == 2)
		{
            //Save to server
            if([self checkemail])
            {
                return;
            }
            
            //get loading screen up
            NSDictionary* loadDict = [NSDictionary dictionaryWithObject:@"Loading..." forKey:@"text"];
            [[NSNotificationCenter defaultCenter] postNotificationName:NTF_LOADING_SCREEN_SHOULD_SHOW object:nil userInfo:loadDict];
            
            //request url
            [self requestForUploading];
            [userManager isLabeltobeShown:4];

		}

The problem is the loading screen stops suddenly when I choose the option above. In ideal scenario it should stop when I again call

[[NSNotificationCenter defaultCenter] postNotificationName:NTF_LOADING_SCREEN_SHOULD_HIDE object:nil userInfo:loadDict];

which I am calling once I get the response from the server. But in my case the loading screen simply dies before i get any response from the server.

Can anyone suggest some ways

 

[robbieduncan]

What is observing that notification? Can you post that method? I suspect it is blocking which could be the problem.

 

[anuhoho]

I have made a class LoadingScreenManager where I have added the observers and that class I have initiated in the application delegate class. I have done this much only.

 

[robbieduncan]

I have made a class LoadingScreenManager where I have added the observers and that class I have initiated in the application delegate class. I have done this much only.

For the second time: post that code.

 

[anuhoho]

Here is what I did

In the application delegate class I registered the loading screen manager as this:

    //loading screen manager
	LoadingScreenManager* newLoadingScreenManager = [[LoadingScreenManager alloc] initWithoutArguments];
	self.loadingScreenManager = newLoadingScreenManager;
	[newLoadingScreenManager release];

The loading screen manager class is below. Here LoadingView is a UIView class where defined a UILabel and activity indicator controller.

- (id)initWithoutArguments
{
	if(self == [super init])
	{
		//loading view
		LoadingView* newLoadingView = [[LoadingView alloc] initWithoutArguments];
		loadingView = [newLoadingView retain];
		[newLoadingView release];
		
		//register for notifications
		[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(loadingViewShouldShow:) name:NTF_LOADING_SCREEN_SHOULD_SHOW object:nil];
		[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(loadingViewShouldHide:) name:NTF_LOADING_SCREEN_SHOULD_HIDE object:nil];
        
	}
	
	return self;
}

- (void)loadingViewShouldShow:(NSNotification*)notification
{
	//check userInfo for 'text' key
	NSDictionary* infoDict = [notification userInfo];
	NSString* newText = [infoDict objectForKey:@"text"];
	if([newText length] == 0)
	{
		newText = @"Loading...";
	}
	
	//bring back to view
	[self.loadingView setText:newText];
	if([self.loadingView superview] == nil)
	{
		UIWindow* window = [[UIApplication sharedApplication] keyWindow];
		[self.loadingView setFrame:window.frame];
		[window addSubview:self.loadingView];
		[window bringSubviewToFront:self.loadingView];
		
		[self.loadingView setHidden:NO];
		[self.loadingView.spinner startAnimating];
	}
}

- (void)loadingViewShouldHide:(NSNotification*)notification
{
	if([self.loadingView superview])
	{
		[self.loadingView removeFromSuperview];
		[self.loadingView.spinner stopAnimating];
		[self.loadingView setHidden:YES];
	}
}
- (void)dealloc
{
	[loadingView release];
	
	[super dealloc];
}

In the class where I have used this notification is below

Here I have a button which pops up four options in the alert view and in one of the options I start the loading screen. But the screen dies very quickly just after I start it.

-(void)saveButton:(id)sender {
...
..
if([buttontext isEqualToString:@"Always Ask"])
    {
        
        UIAlertView *alertSave=[[UIAlertView alloc]initWithTitle:@"Select" message:@"Where do you want to save" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Local Contact",@"Server Connections",@"Both",nil];
        
        alertSave.tag = kAlertViewOne;
		[alertSave show];
	    [alertSave release];

	}
..
}

#pragma mark -
#pragma mark UIAlertViewDelegate methods

- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {

if(buttonIndex == 2)
		{
            //Save to Server
            if([self checkemail])
            {
                return;
            }
            //get loading screen up
            NSDictionary* loadDict = [NSDictionary dictionaryWithObject:@"Loading..." forKey:@"text"];
            [[NSNotificationCenter defaultCenter] postNotificationName:NTF_LOADING_SCREEN_SHOULD_SHOW object:nil userInfo:loadDict];
            
            //request url
            [self requestForUploading];

		}

Then in the http delegate class ie.,in the connectionDidFinishLoading class I hide the loading screen

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
    
    NSString *responseString = [[NSString alloc] initWithData:dataWebService encoding:NSUTF8StringEncoding];
    
    NSLog(@"Response: %@",responseString);
    
    [responseString release];
    
    [dataWebService release];
    
    //dismiss loading screen
	[[NSNotificationCenter defaultCenter] postNotificationName:NTF_LOADING_SCREEN_SHOULD_HIDE object:nil];
    

    [self.navigationController popToViewController:[self.navigationController.viewControllers objectAtIndex:1] animated:NO];
    
    
}

But before reaching it only the loading screen dies. Here is the code. Can anyone help me what may be the problem.