Sorry if this is a stupid question.

I need to create a Dictionary class or extension that returns a dictionary of type [String, AnyObject]

I did this

extension Dictionary {

  static func createDict(screenOn: Bool,
                               delay: String,
                               duration: Float) -> Dictionary<String,AnyObject> {

    return ["screenOn": screenOn,
       "delay": delay,
       "duration": duration]
  } 
}

I have these errors:

Cannot convert value of type 'Bool' to expected dictionary value type 'AnyObject'

Cannot convert value of type 'String' to expected dictionary value type 'AnyObject'

Cannot convert value of type 'Float' to expected dictionary value type 'AnyObject'

how do I solve that?

AnyObject refers to classes; Bool, String and Float are not classes in Swift.

You need to use Any if you are putting Bool, String and Float values in your Dictionary.

Paul has an article about the difference: What’s the difference between Any and AnyObject?