remove non ASCII characters from NSString in objective-c

Question

I have an app that syncs data from a remote DB that users populate. Seems people copy and paste crap from a ton of different OS\'s and programs which can cause different hi

Answer 1

While I strongly believe that supporting unicode is the right way to go, here's an example of how you can limit a string to only contain certain characters (in this case ASCII):

NSString *test = @"Olé, señor!";

NSMutableString *asciiCharacters = [NSMutableString string];
for (NSInteger i = 32; i < 127; i++)  {
    [asciiCharacters appendFormat:@"%c", i];
}

NSCharacterSet *nonAsciiCharacterSet = [[NSCharacterSet characterSetWithCharactersInString:asciiCharacters] invertedSet];

test = [[test componentsSeparatedByCharactersInSet:nonAsciiCharacterSet] componentsJoinedByString:@""];

NSLog(@"%@", test); // Prints @"Ol, seor!"