swift - Variable used before being initialised -

i've written code below , error

(1) variable self.pointonmap used before being initialised.

and

(2) variable self.pointonmap captured closure before being initialised.

i don't see why because have declared self.pointonmap = mkpointannotation() should initialise enough.

class pin: nsmanagedobject {     var mapview: mkmapview?     var pointonmap: mkpointannotation?      @nsmanaged var lat: double     @nsmanaged var lon: double     @nsmanaged var photos: photo?      override init(entity: nsentitydescription, insertintomanagedobjectcontext context: nsmanagedobjectcontext?) {         super.init(entity: entity, insertintomanagedobjectcontext: context)         self.pointonmap = mkpointannotation()     }      init(dictionary: [string : anyobject], context: nsmanagedobjectcontext) {         let entity = nsentitydescription.entityforname("pin", inmanagedobjectcontext: context)!         super.init(entity: entity, insertintomanagedobjectcontext: context)          lat = 1.0         lon = 2.0          self.pointonmap = mkpointannotation()         println(self.pointonmap) // returns error (1)         self.pointonmap!.coordinate = cllocationcoordinate2d(latitude: lat, longitude: lon) // returns error (2)     } 

i can't reproduce setup, can't test exact example, think should use convenience initializer , self.init this:

class pin: nsmanagedobject {     var mapview: mkmapview?     var pointonmap: mkpointannotation?     @nsmanaged var lat: double     @nsmanaged var lon: double     @nsmanaged var photos: photo?      override init(entity: nsentitydescription, insertintomanagedobjectcontext context: nsmanagedobjectcontext?) {         super.init(entity: entity, insertintomanagedobjectcontext: context)         self.pointonmap = mkpointannotation()     }      // replace `init` `convenience init`     convenience init(dictionary: [string : anyobject], context: nsmanagedobjectcontext) {          let entity = nsentitydescription.entityforname("pin", inmanagedobjectcontext: context)!          // call overriding init `self.init(...)` instead of `super.init(...)`         self.init(entity: entity, insertintomanagedobjectcontext: context)          // now, self.pointonmap has value declared `override init`          lat = 1.0         lon = 2.0          self.pointonmap = mkpointannotation()         println(self.pointonmap)         self.pointonmap!.coordinate = cllocationcoordinate2d(latitude: lat, longitude: lon)     } } 

have @ "designated , convenience initializers in action" in page, think covers case.