Question

Example of what I am trying to do:

String = “This is my sentence”

I am looking to get this as a result: “TIMS”

I am struggling with objective-c and strings for some reason

Answer 1

Naïve solution:

NSMutableString * firstCharacters = [NSMutableString string];
NSArray * words = [@"this is my sentence" componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
for (NSString * word in words) {
  if ([word length] > 0) {
    NSString * firstLetter = [word substringToIndex:1];
    [firstCharacters appendString:[firstLetter uppercaseString]];
  }
}

Note that this is kinda stupid about breaking up words (just going by spaces, which isn’t always the best approach), and it doesn’t handle UTF16+ characters.

If you need to handle UTF16+ characters, change the if() statement inside the loop to:

if ([word length] > 0) {
  NSString * firstLetter = [word substringWithRange:[word rangeOfComposedCharacterSequenceAtIndex:0]];
  [firstCharacters appendString:[firstLetter uppercaseString]];
}