NSTimer problem

[Mixsiah]

simulated in iOS4.1

My app takes RSS data and loads in a table.

If it loads once it's fine....BUT the problem starts when I use the NSTimer to autorefresh every 10 seconds, it closes the app and goes back to homescreen.

Any suggestions?

- (void)viewDidAppearBOOL)animated {
[super viewDidAppear:animated] ;

if([blogEntries count] == 0) {
[self refreshData] ;
}

reloadTimer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector (refreshData ) userinfo:nil repeats:YES] ;

}

- (void)refreshData{
NSString *blogAddress = @"http://twitter.com";
[self grabRSSFeed:blogAddress];
[blogTable reloadData];
}

- (void)viewWillDisappearBOOL)animated {
[reloadTimer invalidate] , reloadTimer = nil;
}

[lukeinjax]

If you comment out:

[blogTable reloadData];

does it still crash?

Your problem might be in your reloadData function, not the timer.

Also, I don't think this is valid syntax:

- (void)viewWillDisappearBOOL)animated {
[reloadTimer invalidate] , reloadTimer = nil;
}

Maybe a cut and paste error?

[Mixsiah]

hi

the refreshdata method is valid because I call that from an if statement and it works...


basically what i am trying to do is for the NSTimer to call the refreshdata method every 10 seconds....im a newbie so i might've made a syntax error somewhere....I studied and copied a lot of codes and still can't get it to work.

Maybe a cut and paste error?[/quote]...not sure about this either.


Please feel free to correct the code.

[lukeinjax]

Originally Posted by Mixsiah

hi

the refreshdata method is valid because I call that from an if statement and it works...


basically what i am trying to do is for the NSTimer to call the refreshdata method every 10 seconds....im a newbie so i might've made a syntax error somewhere....I studied and copied a lot of codes and still can't get it to work.

Maybe a cut and paste error?

...not sure about this either.


Please feel free to correct the code.[/quote]

This should read:

- (void)viewWillDisappearBOOL)animated {
    [reloadTimer invalidate];
    reloadTimer = nil;
}

There might also be an issue with calling the refreshData method a second time - once in your if statement and again in the timer code. If that method is releasing something that's trying to be accessed the second time, that might be your issue.

Are there any messages in the console when your app crashes?

[Mixsiah]

Originally Posted by lukeinjax

...not sure about this either.


Please feel free to correct the code.

This should read:

- (void)viewWillDisappearBOOL)animated {
    [reloadTimer invalidate];
    reloadTimer = nil;
}

----DONE

There might also be an issue with calling the refreshData method a second time - once in your if statement and again in the timer code. If that method is releasing something that's trying to be accessed the second time, that might be your issue.


Are there any messages in the console when your app crashes?[/quote]

---I commented the if statement so it calls only the NSTimer in the viewDidLoad but it still displays this message:

NSTimer may not respond to '+scheduleTimerWithTimeInterval:target:selector:us erinfo:repeats


I watched all of the tutorials in youtube and its pretty simple. I copied it exactly.

[lukeinjax]

I think I see your error.

reloadTimer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector (refreshData ) userinfo:nil repeats:YES] ;

should be:

reloadTimer = [NSTimer scheduledTimerWithTimeInterval:10 target:self selector:@selector (refreshData ) userInfo:nil repeats:YES] ;

Note the userInfo param. Case matters.

Also, see the "Timers" section of this page for an example:

iPhone SDK Examples

[BrianSlick]

Originally Posted by Mixsiah

---I commented the if statement so it calls only the NSTimer in the viewDidLoad but it still displays this message:

NSTimer may not respond to '+scheduleTimerWithTimeInterval:target:selector:us erinfo:repeats

Try copy-pasting the method name out of the documentation. You have at least a couple of typos.

[Mixsiah]

By the way,

I started a new simple NSTimer project in a view based App

YouTube - Using a Timer in iPhone SDK

copied exactly the tutorial and it worked. All the code seem to be the same...



You think this has something to do that my app is reloading a table?

[Mixsiah]

SHARP EYES!!! ---userInfo corrected....IT WORKED!!

Thank you so much!