ios - cannot invoke initializer for Unmanaged<AnyObject>? with no arguments in swift -

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what want convert rsa sec key base64 encoded string swift. initialized variable below,

var publickeybits = unmanaged<anyobject>?()

then gives

cannot invoke initializer unmanaged? no arguments in swift

i want covert publickey below

var publickeybits = unmanaged<anyobject>?() secitemcopymatching(queryattrs, &publickeybits)  let opaquebits = publickeybits?.toopaque()  let publickeydata = unmanaged<nsdata>.fromopaque(opaquebits).takeunretainedvalue()  let publickeybase64 = publickeydata.base64encodeddata(nsdatabase64encodingoptions.encoding64characterlinelength)

error. idea of this.

you need check initialization of unmanaged class, there might initialization parameters.

var publickeybits = unmanaged<anyobject>("mykey")




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