Auto Suggestion based on user input

[ghost]

Is it possible to auto suggest item based on user input. fx. I have the following url "https://itunes.apple.com/search?term=" where users have to enter a search term?

I have tried to the following:

define baseURL @"https://itunes.apple.com/search?term="

• (void)autoCompleteTextField:(MLPAutoCompleteTextField )textField possibleCompletionsForString:(NSString )string completionHandler:(void (^)(NSArray *))handler { dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0); dispatch_async(queue, ^{ if(self.simulateLatency){ CGFloat seconds = arc4random_uniform(4)+arc4random_uniform(4); //normal distribution NSLog(@"sleeping fetch of completions for %f", seconds); sleep(seconds); }

  NSMutableArray* jsonObject = [[NSMutableArray alloc]init];
  NSMutableArray* suggestionlist = [[NSMutableArray alloc]init];
  NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@%@",baseURL,textField.text]]];
  NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
  NSError* error;
  jsonObject = [NSJSONSerialization
              JSONObjectWithData:response
              options:0
              error:&error];
  
  for (int i = 0 ; i < jsonObject.count; i++) {
    NSString* artistName = [[jsonObject objectAtIndex:i] objectForKey:@"artistId"];
    [suggestionlist addObject:artistName];
  }

  handler(suggestionlist); }); }

But I got the following error:

GAIUncaughtExceptionHandler(NSException ) (GAIUncaughtExceptionHandler.m:41): Uncaught exception: data parameter is nil 2014-05-15 11:49:54.224 MLPAutoCompleteDemo[6349:5503] GoogleAnalytics 2.0b4 void GAIUncaughtExceptionHandler(NSException ) (GAIUncaughtExceptionHandler.m:38): Bailing on multiple uncaught exceptions: data parameter is nil 2014-05-15 11:49:54.224 MLPAutoCompleteDemo[6349:5503] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'data parameter is nil'

Any suggestions why it is not working?

[damien-rivet]

Hi there,

Not the solution for the current issue, just a little cleanup :

From :

if(self.testWithAutoCompleteObjectsInsteadOfStrings && suggestionlist != nil){
    completions = suggestionlist;
} else {
    completions = suggestionlist;
}

To :

completions = suggestionlist;

[EddyBorja]

Can you check to see if the NSError is not nil after the NSJSONSerialization and NSLog it out?

[ghost]

The data are retrieved from the web service without problem but the error occurs at this line: NSString* artistName = [[jsonObject objectAtIndex:i] objectForKey:@"artistId"]; Which doesnt make any sense because I have tested the code outside MLPAutoCompleteTextField and it was working fine.

[ghost]

Fixed it. It was a problem in my code.