I\'ve already found how to capitalize all words of the sentence, but not the first word only.
NSString *txt =@\"hi my friends!\"
[txt capitalizedString];
Here is another go at it:
NSString *txt = @"hi my friends!";
txt = [txt stringByReplacingCharactersInRange:NSMakeRange(0,1) withString:[[txt substringToIndex:1] uppercaseString]];
For Swift language:
txt.replaceRange(txt.startIndex...txt.startIndex, with: String(txt[txt.startIndex]).capitalizedString)