Trim spaces from end of a NSString

Question

I need to remove spaces from the end of a string. How can I do that? Example: if string is \"Hello \" it must become \"Hello\"

Answer 1

I came up with this function, which basically behaves similarly to one in the answer by Alex:

-(NSString*)trimLastSpace:(NSString*)str{
    int i = str.length - 1;
    for (; i >= 0 && [str characterAtIndex:i] == ' '; i--);
    return [str substringToIndex:i + 1];
}

whitespaceCharacterSet besides space itself includes also tab character, which in my case could not appear. So i guess a plain comparison could suffice.