ios - MKAnnotation Not Conform to Protocol -

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i new ios programming , having problem extending locationa class conform mkannotation protocol.

the locationa class is:

import mapkit  class locationa {     let name: string     let identifier: string     let latitude: cllocationdegrees     let longitude: cllocationdegrees      init (name: string, identifier: string, latitude: cllocationdegrees, longitude: cllocationdegrees) {         self.name = name         self.identifier = identifier         self.latitude = latitude         self.longitude = longitude     } }

the extended version is:

import mapkit  extension locationa: mkannotation, nsobject {     var coordinate: cllocationcoordinate2d {         return cllocationcoordinate2d(latitude: latitude, longitude: longitude)     }     var title: string! {         return identifier     }     var subtitle: string! {         return name     } }

it appears have implemented attributes required protocol still getting "not conform protocol" error. advice appreciated!


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