Question

I am trying to create an iOS app which involves one main if statement to check if a text box contains certain text. I would like to check for multiple instances of a certain word but I don’t want to do multiple if statements as this will dramatically slow down the performance of the app.

How can I check if a word matches that of a word in an NSArray, and if it does, return a NSString associated with that word in another text box?

Answer 1

You can create an NSDictionary of the words you are checking against mapped against the NSString you want returned when that word is entered:

NSDictionary *words = [[NSDictionary alloc] initWithObjectsAndKeys:
    @"word1", @"result1",
    @"word2", @"result2",
    /*etc*/
    nil];

NSString *wordFromTextBox = ...;
NSString *result = [words objectForKey:keyword];
if (result != nil)
{
    // use result
}
else
{
    // word wasn't something we expected
}

// Some time later
[words release];

EDIT: To iterate over the list so you can test if the keywords are contained in the textbox, you can do the following (assume words and wordFromTextBox are set-up as before):

NSEnumerator *enumerator = [words keyEnumerator];
while ((NSString *keyword = [enumerator nextObject]) != nil)
{
    if ([wordFromTextBox rangeOfString:keyword].location != NSNotFound)
    {
        NSLog(@"The text box contains keyword '%@'", keyword);
        NSString *result = [words objectForKey:wordFromTextBox];
        // Use the result somehow
        break;
    }
}