Question

In my app I download a file from amazon’s s3, which does not work unless the file name has no spaces in it. For example, one of the files is “HoleByNature”. I would like to display this to the user as “Hole By Nature”, even though the file name will still have no spaces in it.

I was thinking of writing a method to search through the string starting at the 1st character (not the 0th) and every time I find a capital letter I create a new string with a substring until that index with a space and a substring until the rest.

So I have two questions.

1. If I use NSString’s characterAtIndex, how do I know if that character is capital or not?
2. Is there a better way to do this?

Thank you!

Answer 1

Works for all unicode uppercase and titlecase letters

- (NSString*) spaceUppercase:(NSString*) text {
    NSCharacterSet *set = [NSCharacterSet uppercaseLetterCharacterSet];
    NSMutableString *result = [NSMutableString new];
    for (int i = 0; i < [text length]; i++) {
        unichar c = [text characterAtIndex:i];
        if ([set characterIsMember:c] && i!=0){
            [result appendFormat:@" %C",c];
        } else {
            [result appendFormat:@"%C",c];
        }
    }   
    return result;
}