Converting NSDecimalNumber to NSString

Question

I'm retrieving a key from an object that looks like this:

po obj
{
  TypeID = 3;
  TypeName = Asset;
}

The key value is being retrieved like this:

NSString *typeId = (NSString*)[obj objectForKey:@"TypeID"];

Rather than typeId being an NSString, it is an NSDecimalNumber. Why is that?

How do I convert it to an NSString?

Solution 1

You need to use the stringWithFormat function:

NSString *typeId = [NSString stringWithFormat:@"%@", [obj objectForKey:@"TypeID"]];

or stringValue:

NSString *typeId = [[obj objectForKey:@"TypeID"] stringValue];

Solution 2

This should work:

NSString *typeId = [[obj objectForKey:@"TypeID"] stringValue];

Solution 3

If you want to get string value, just use "description". It works fine even if returned type is NSDecimalNumber, or NSString, or whatever:

NSString *typeId = [[obj objectForKey:@"TypeID"] description];

Solution 4

Since this is the top search result and I don't see a question for NSDecimalNumber to String in Swift, here it is. This will show the localized decimal separator and all decimal places with a non-zero value.

let string = decimalNumber.description(withLocale: Locale.current)

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Comments

[axiixc]

You can't just cast an NSString to an NSDecimalNumber, they are different type's and you'll crash if you try to use NSDecimalNumber methods on that pointer.