Question

First i will obtain the database in an NSArray so it is not sqlite issue.

My question is about detecting the word, simply i need to auto-complete word from an NSArray during the typing.

I found some tutorials which talking about

[UITextFieldTextDidChangeNotification - addObserver .. etc]

but not describing it clearly.

Answer 1

You have to implement UITextfield action method Editing Changed in your .m file and then implement following code for search and filter array according you typp in it.

 NSString *match = textField.text; 
 NSMutableArray *listFiles = [[NSMutableArray alloc] init];
 NSPredicate *sPredicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[cd] %@", match];
 listFiles = [NSArray arrayWithArray:[YOURARRAYNAME filteredArrayUsingPredicate:sPredicate]];
 NSLog(@"%@",listFiles);

 // following array gives you sorted array
    NSMutableArray *sortedArray = [[NSMutableArray alloc]initWithArray: [listFiles sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)]];

    NSLog(@"%@",sortedArray);