**Background**

I am trying to encode a String-style enum using the NSCoding protocol, but I am running into errors converting to and back from String.

I get the following errors while decoding and encoding:

*String is not convertible to Stage*

*Extra argument ForKey: in call*


**Code**

        enum Stage : String
        {
            case DisplayAll    = &quot;Display All&quot;
            case HideQuarter   = &quot;Hide Quarter&quot;
            case HideHalf      = &quot;Hide Half&quot;
            case HideTwoThirds = &quot;Hide Two Thirds&quot;
            case HideAll       = &quot;Hide All&quot;
        }
        
        class AppState : NSCoding, NSObject
        {
            var idx   = 0
            var stage = Stage.DisplayAll
        
            override init() {}
        
            required init(coder aDecoder: NSCoder) {
                self.idx   = aDecoder.decodeIntegerForKey( &quot;idx&quot;   )
                self.stage = aDecoder.decodeObjectForKey(  &quot;stage&quot; ) as String    // ERROR
            }
            
            func encodeWithCoder(aCoder: NSCoder) {
                aCoder.encodeInteger( self.idx,             forKey:&quot;idx&quot;   )
                aCoder.encodeObject(  self.stage as String, forKey:&quot;stage&quot; )  // ERROR
            }
    
        // ...
    
        }

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How do I encode enum using NSCoder in swift?