ios - How to save the Swift Enum that contains Associated Values to the NSUserDefault? -

what's issue

i trying save instance of customized swift enum contains associated values each enum cases nsuserdefault. reason s because associated values referencing objects need reused when app relaunched, means objects referenced custom objects need aware of app when got launched.

example

class abcmodecontroller {  static var sharedinstance = abcmodecontroller()  enum abcmode {      case on([abcmachine], int?, uicolor?)     case off([abcmachine])     case toggle([abcmachine], int?, uicolor?)  }  var custommode1:abcmode? var custommode2:abcmode? var custommode3:abcmode? 

}

what's expected behavior

from above example, swift enum gets wrapped in a singleton class expected each instance of abcmode, custommode1, custommode2, custommode3, can saved userdefault when gets "didset" value. , when app gets relaunched, userdefault restore each instance of abcmode in singleton class.

what's tried & potential solutions

• the swift enum can set rawvalue itself, while found setting rawvalue int , string did not solve problem yet, , wonder if can set object rawvalue of enum? if can solution, how make rawvalue contained associated value of each enum cases?
• i wonder if swift enum can converted nsdata saving userdefault?
• is utilizing nscoding better solution it?

what ask for

• how save swift enum contains associated values nsuserdefault?
• is there better solution addressing same issue described above?

what system & tool in-use

• xcode 8.3
• swift 3
• ios 9.0 & above

thank much.