Question

I have NSString like this: @”text 932″.

How I can return number from this string. Number is always at the end of string, but i can’ t use stringWithRange, because number don’ t have constant length. So I’m seeking for better method.

I aslo want’ know how to return number from string like this @”text 3232 text”. I aslo don’ t know position of number.

There is any function that find number in string ?

Answer 1

Here is a solution that will work for both strings

NSString *myString = @"text 3232 text";

//Create a scanner with the string
NSScanner *scanner = [NSScanner scannerWithString:myString];

//Create a character set that includes all letters, whitespaces, and newlines
//These will be used as skip tokens
NSMutableCharacterSet *charactersToBeSkipped = [[NSMutableCharacterSet alloc]init];

[charactersToBeSkipped formUnionWithCharacterSet:[NSCharacterSet letterCharacterSet]];
[charactersToBeSkipped formUnionWithCharacterSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

[scanner setCharactersToBeSkipped:charactersToBeSkipped];
[charactersToBeSkipped release];

//Create an int to hold the number   
int i;

//Do the work
if ([scanner scanInt:&i]) {

    NSLog(@"i = %d", i);
}

The output of the NSLog is

i = 3232

EDIT

To handle decimals:

float f;

if ([scanner scanFloat:&f]) {

   NSLog(@"f = %f", f);
}