Process the result of server side app version check

gistfile1.m

- (void)request:(ASIHTTPRequest *)request didReceiveData:(NSData *)data {
  NSString *dataString = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];

  if ([dataString length] > 0) {
    self.manifest = [NSDictionary dictionaryWithDictionary:[dataString JSONValue]];

    if ([[_manifest objectForKey:@"needsUpdate"] boolValue] == YES && [self remindNow] == YES) {
      NSString *alertTitle = NSLocalizedString(@"Update available", nil);
      if ([[_manifest allKeys] containsObject:@"alertTitle"]) {
        alertTitle = [_manifest objectForKey:@"alertTitle"];
      }
      NSString *alertMessage = NSLocalizedString(@"v%@ update is now available on the App Store.", nil);
      alertMessage = [alertMessage stringByAppendingFormat:@"\n\n%@\n\n%@", NSLocalizedString(@"You are currently using v%@.", nil), NSLocalizedString(@"Please update to the latest version.", nil)];
      if ([[_manifest allKeys] containsObject:@"alertMessage"]) {
        alertMessage = [_manifest objectForKey:@"alertMessage"];
      }
      
      NSString *latestVersion = [_manifest objectForKey:@"latestVersion"];
      NSString *bundleVersion = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"];
      
      UIAlertView *alert = [[[UIAlertView alloc] initWithTitle:alertTitle
                                                       message:[NSString stringWithFormat:alertMessage, latestVersion, bundleVersion]
                                                      delegate:self
                                             cancelButtonTitle:NSLocalizedString(@"Remind later", nil)
                                             otherButtonTitles:NSLocalizedString(@"Get update", nil), nil] autorelease];
      [alert show];
    }
  }
  
  self.manifestRequest = nil;
}