Swift CoreData -- Cannot assign value of type 'Int' to type 'Int16'

Question

I declared a CoreData entity Address with a 'zip' attribute of type Int16.

Problem is, when I assign an integer to that attribute:

address?.zip = Int(zipField.text!)

I get an error saying Cannot assign value of type Int to type Int16. Makes sense (I guess).

Problem is, when I try casting that int to an Int16, XCode still blows up on me:

let zip:Int? = Int(zipField.text!)
if zip != nil {
    let zip16 = Int16(zip!)
}

It's that line where I convert the integer that causes XCode to crash. I am not really seeing any information in the error message, so I'm not sure what to try.

In general, should I be using Int64 because of the operating system of these phones?

Answer 1

You should banish all !s from your code. That just tells the compiler "crash here if I do something wrong":

if let str = zipField.text,
    let zip = Int16(str) {
    address?.zip = zip
}

Also, you should read about Swift's guard statement because there's no point in running any of that code if you don't have an address. Something like:

guard let addr = address else { return }
addr.zip = 90210

Answer 2

You can use:

address?.zip = Int16(zipField.text!)

And in document of structure Int16, about init?(String, radix: Int),there is the following discussion:

If text does not match the regular expression “[+-]?[0-9a-zA-Z]+”, or the value it denotes in the given radix is not representable, the result is nil.

So you should make sure the text is valid in order to convert.