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Editorial Team
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Asked: 2026-06-13T20:42:55+00:00

I have following code for the UIAlertView Loading indicator which is not working and

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I have following code for the UIAlertView Loading indicator which is not working and giving me 

- (void) launchActivity
{
 //some logic...
[NSThread detachNewThreadSelector:@selector(updateFilterProgress) toTarget:self withObject:nil];
}
- (void) updateFilterProgress {
 if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN))
{
    UIAlertView *myAlert = [[[UIAlertView alloc] initWithTitle:@"No Internet Connectivity" message:@"This app require an internet connection via WiFi or cellular network to work." delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil] autorelease];
    [myAlert show];
}
else{
    UIAlertView *alertMe = [[[UIAlertView alloc] initWithTitle:@"Loading..." message:nil delegate:nil cancelButtonTitle:nil otherButtonTitles: nil] autorelease] ;


  //tried this way by placing below line....no result   
  [alertMe performSelectorOnMainThread:@selector(show) withObject:nil waitUntilDone:YES];
    //[alertMe show];

 //some logic...
}

Updated:
On main thread I am calling web-service and loading data. hence I have given another thread for Loading UIAlertView and it was working with iOS 4,5. but its crashing in iOS 6. If I am placing AlerView on main thread then while loading nothing shows but after getting data loaded AlertView shows Loading Indicator for few seconds. Any suggestion…

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1 Answer

  1. Editorial Team

    You are showing the alert from the detached thread while you must do it from the main thread, either use GCD or performSelectorOnMainThread.

    On the main thread you usually want to perform only the UI update, all the complex calculations and data loading are to be executed in the detached threads. If you try to load the data in the main thread, the UI will no be responding during the loading. So that is a good practice to load the data in the detached thread, on the main thread you show the alert as you need on the loading start and dismiss it on the loading (and parsing) finished, calling the content UI update as well:

    Load/Refresh datasource flow

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