Import Swift class created dynamically - ios

Question

I am experimenting with a piece of code and I need some assistance. I am creating a file that is a swift file that contains a class and a variable. I am able to successfully create and read the file. Now, is it possible for my to use this swift file and access its variable (v, in this case)?
func writeF() {
let file = "Sample.swift"
let text = "import Foundation \n" +
"public class Sample { \n" +
" let v: Int = 0 \n" +
"}"
if let dir = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true).first {
let path = NSURL(fileURLWithPath: dir).URLByAppendingPathComponent(file)
//writing
do {
try text.writeToURL(path, atomically: false, encoding: NSUTF8StringEncoding)
}
catch {print("error writing file")}
//reading
do {
let text2 = try NSString(contentsOfURL: path, encoding: NSUTF8StringEncoding)
print(text2)
}
catch {
print("error reading file")
}
}
}

Answer 1

You can't add code on runtime. When your code is compiled, there are no *.swift files left, that can be read by humans. After compiling, your code is basically 0 and 1 only.

Answer 2

As FelixSFD said in their answer, you cannot dynamically build a Swift file and compile it at runtime on the device, at least not in the normal Sandboxed environment. If you have a Jailbroken device, you can build and install the Swift open source runtime and compile programs on-the-fly that way.
As an alternative, you could look into the JavaScriptCore framework to build and run dynamic JavaScript code, and bridge it into your app.
Here's a quick example of passing an object to JavaScript and returning the same object with a class mapping:
import JavaScriptCore
let js = "function test(input) { return input }"
class TestClass: NSObject {
var name: String
init(name: String) {
self.name = name
}
}
let context = JSContext()
context.evaluateScript(js)
let testFunc = context.objectForKeyedSubscript("test")
let result = testFunc.callWithArguments([TestClass(name: "test")])
result.toDictionary()
let testObj = result.toObjectOfClass(TestClass.self) as? TestClass
testObj?.name // "test"