swift - NSTextAlignment can not be represented in Objective-C -

in swift class, exposed variable objective c defining

@objc var textalignment: nstextalignment? {     didset {         if textalignment != nil {             label.textalignment = textalignment!         }     } } 

and wrong! because compiler complains not type can represented in objective-c.

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but followings right

var textalignment: nstextalignment? {     didset {         label.textalignment = textalignment!     } } 

or

@objc var textalignment: nstextalignment {     didset {         label.textalignment = textalignment     } } 

so looks if expose method objective-c, can not optional value. if use internally, can! because scalar value in objective-c have no way represent nil?

my intention want make not compulsory.

nstextalignment enum, not class - textalignment variable can't mapped optional objective c because require pointer object type.

try:

@objc var textalignment: nstextalignment {    ... } 

or, if need optional, expose objective c nsnumber, wrapping textalignment.rawvalue or setting nil when no value needed.