Parameterized Initializer Reflection in Swift - swift

Question

I am trying to apply reflection on a swift class (someClass) to invoke an init method that takes one argument (someArg), I managed to get the init selector and IMP that has 1 argument, but when I invoke the IMP it ends up calling the init with no arguments. In the Playground below I always get "called the wrong init" printed.
If I remove the override init I get the following error:
fatal error: use of unimplemented initializer 'init()' for class '__lldb_expr_15.someClass'
What am I missing?
import UIKit
public class someClass:NSObject{
init( num:someArg){
print("called the right init")
}
override init(){
print("called the wrong init")
}
}
public class someArg:NSObject{
override init(){
}
}
public class Test{
func reflect(){
let classType: NSObject.Type = someClass.self as NSObject.Type
let (initializerWithOneArgImp,selector) = getInitializerWithArguments(classType, argumentsCount: 1)
typealias initializerWithOneArgImpType = #convention(c) (AnyObject, Selector, AnyObject) -> (AnyObject)
let callback = unsafeBitCast(initializerWithOneArgImp , initializerWithOneArgImpType.self)
callback(classType,selector,someArg())
}
func getInitializerWithArguments(classType:AnyClass, argumentsCount:Int)->(IMP,Selector){
var methodCount:CUnsignedInt = 0
let methodList = class_copyMethodList(classType.self, &methodCount)
let n : Int = Int(methodCount)
for var i: Int = 0; i < n; i++ {
let methodSelector = method_getName(methodList[i])
let methodName:String = String(_sel:methodSelector)
if(methodName == "init")
{
let methodArgumentsCount = method_getNumberOfArguments(methodList[i])
if(methodArgumentsCount == UInt32(argumentsCount) + 1)
{
return (method_getImplementation(methodList[i]),methodSelector)
}
}
}
return (nil,nil)
}
}
var test = Test()
test.reflect()

Answer 1

Turns out, the non parametrized init has two arguments by default, and the parameterized init would have "initWithNum" as methodName.
if(methodName.hasPrefix("init"))
{
let methodArgumentsCount = method_getNumberOfArguments(methodList[i])
if(methodArgumentsCount == UInt32(argumentsCount) + 2)
{
return (method_getImplementation(methodList[i]),methodSelector)
}
}