Hoi!
I got a NSString which looks something like this: "$1.00". Always a currency symbol with a value.
I format this string to remove the symbol and any non-decimal characters with str = [str stringByTrimmingCharactersInSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]]. This leaves me with "1.00".
Now I'm checking with [str rangeOfCharacterFromSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]].location == NSNotFound if there are any non-decimal characters in there. Since I removed all of them before this should return YES. But I am getting NO with the location pointing to the decimal separator.
Does anyone have an idea what is going wrong here? Maybe it's a stupid mistake but I can't find it...
Additional info
I just found a similar issue: I got a string "$20,000.00" and use execute this code:
NSCharacterSet *nonNumbersSet = [[NSCharacterSet characterSetWithCharactersInString:[NSString stringWithFormat:@"0123456789."]] invertedSet];
NSString* numberString = [_value stringByTrimmingCharactersInSet:nonNumbersSet];
The result is "20,000.00". Those methods seem to have a problem with those characters in general. If anyone has a solution to this please tell me.
Okay, I just found the solution. I just had a wrong understanding of stringByTrimmingCharactersInSet:. It doesn't remove all characters, only the ones on both ends.