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POWhats inner functinality of nsdata detector In iphone sdk
 

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  1. POWhats inner functinality of nsdata detector In iphone sdk
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    <p>I got strange results using NSDataDetector and I am looking for insight in how it works.</p> <p>Is it matching against an internal database or is it using any separation algorithm to detect the separate fields in string?</p> <p>Currently, I am using the following code to detect the fields of an address:</p> <pre><code>NSDataDetector *address = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeAddress error:nil]; NSArray* matcheslinkaa = [address matchesInString:inputString options:0 range:NSMakeRange(0, [inputString length])]; if ([matcheslinkaa count]&gt;0) { for (NSTextCheckingResult *match in matcheslinkaa) { if ([match resultType] == NSTextCheckingTypeAddress) { NSDictionary *phoneNumber = [match addressComponents]; NSLog(@"addressComponents %@",phoneNumber); } } } </code></pre> <p>Following is a sample set of input strings and their respective outputs, using the above code:</p> <pre><code>inputString = @"100 Main Street\n" "Anytown, NY 12345\n" "USA"; // prints: // addressComponents { // City = Anytown; // Country = USA; // State = NY; // Street = "100 Main Street"; // ZIP = 12345; // } inputString = @"A-205 Natasha Golf View\n" "2 Inner Ring Road\n" "Bangalore\n" "560071\n" "Karnataka"; // prints: // addressComponents { // City = Bangalore; // Street = "2 Inner Ring Road"; // ZIP = 560071; // } inputString = @"A-205 Natasha Golf View\n" "2 Inner Ring Road\n" "Domlur\n" "Bangalore\n" "560071\n" "India"; // prints: // addressComponents { // City = Bangalore; // Street = "2 Inner Ring Road"; // ZIP = 560071; // } inputString = @"Dak Bhavan\n" "Parliament Street\n" "NEW DELHI 110001\n" "INDIA"; // =&gt; `addressComponents` is empty! </code></pre> <p>As you can see, NSDataDetector has no problem to extract US-addresses. Why is it faring so much worse with Indian addresses that it doesn't even find the country name?</p>
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