1. Use NSNumberFormatter
2. Attach an NSNumberFormatter to the field
3. Sounds like a great use of regular expressions. Check out
http://regexkit.com
Cheers,
Dave
On Nov 14, 2010, at 9:12 AM, William Squires wrote:
> 1) What's the best way to get an NSUInteger from an NSString that has a
> string representation of a valid unsigned 32 bit integer (0..4,294,967,295).
> There's an [NSString integerValue] and an [NSString longLongValue] (int64
> anyone?), but not convenience methods on NSString that return an unsigned
> integer value.
>
> Here's my try: (given an NSString *s with the numerical representation)
>
> ...
> long long i = [s longLongValue];
> // Get the lower 32 bits of i into l
> NSUInteger l = (NSUInteger)(i % 4294967296);
>
> 'l' should - I hope - now have the NSUInteger value that 's' represents.
>
> 2) Also, how can I make an NSTextField only allow valid unsigned 32 bit
> integers to be typed in?
> 3) Finally, what's the simplest way to do a search and replace on an NSString
> of the form @"x####" (where "#" is replaced with valid characters in the
> range '0'..'9') so that I can, in a for-loop from 0 to 9, replace the "x"
> with a single digit? Something like:
>
> NSString *oldNumber = ...; // Code to obtain the value of oldNumber, let's
> say "x103"
> for (int i=0; i<10; ++i)
> {
> NSString *myNewNumber = [oldNumber replaceString:@"x"
> withNewString:[NSString stringWithFormat:@"%u",_
> i]];
>
> // do something with myNewNumber...
> }
>
> myNewNumber should take on the values; "0103", "1103", "2103", ... "9103".
> I'd like to make this a category on NSString for my number crunching project
> I'm working on.
>
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