Extract only DIGIT in Objective c [closed] - objective-c

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I have string this, Total Bill : $22.00, I just want to extract 22 from this string, i'm confused how to get that, I have tried some code but it gives me 2200 rather than 22. My code is this,
NSString * val = #"Total Bill : $22.00";
NSString *newString = [[val componentsSeparatedByCharactersInSet:
[[NSCharacterSet decimalDigitCharacterSet] invertedSet]]
componentsJoinedByString:#""];
NSLog(#"VV %#",newString);

Answer 1

The simplest is to find the location of the $ and then return the rest of the string. This will give you the 22.00.
NSString *val = #"Total Bill : $22.00";
NSRange dollar = [val rangeOfString:#"$"];
NSRange decimal = [val rangeOfString:#"."];
if (dollar.location != NSNotFound && decimal.location != NSNotFound) {
NSRange range = NSMakeRange(dollar.location + 1, decimal.location - dollar.location - 1)
NSString *amount = [val substringWithRange:range];
NSLog(#"VV %#",amount);
} else {
NSLog(#"No dollar sign or decimal found");
}

Answer 2

One option is to use a NSCharacterSet union with the characters you want to keep (currency separator -- decimal point in your case).. then invert it. Split the string and then join it using this character set. Then you can use NSNumberFormatter to get the result..
NSString *stringToParse = #"Total Blah: $22.00";
NSMutableCharacterSet *characterSet = [NSMutableCharacterSet decimalDigitCharacterSet];
[characterSet formUnionWithCharacterSet:[NSCharacterSet characterSetWithCharactersInString:#".,"]];
stringToParse = [[stringToParse componentsSeparatedByCharactersInSet:[characterSet invertedSet]] componentsJoinedByString:#""];
NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];
[formatter setNumberStyle:NSNumberFormatterDecimalStyle];
[formatter setMinimumFractionDigits:0];
[formatter setMaximumFractionDigits:0];
[formatter setPartialStringValidationEnabled:YES];
NSString *str = [formatter stringFromNumber:[formatter numberFromString:stringToParse]];
NSLog(#"%#", str);

Answer 3

You can use NSScanner to extract values like this from a string.
Depending on the type you want, you can use scanDouble:, scanInt: or something else. Here's an example:
NSString *myString = #"Total Bill : $22.00";
NSScanner *scanner = [[NSScanner alloc] initWithString:myString];
// Moves the scanner to the "$" character, then eats that character
[scanner scanUpToString:#"$" intoString:nil];
[scanner scanString:#"$" intoString:nil];
// Here you have options, can scan as a double or an integer, or convert later.
double val = 0;
[scanner scanDouble:&val];