Picker format

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I'm configuring the picker with array values like this:

`row = FormRowDescriptor(tag: Static.picker, rowType: .Picker, title: "Value") row.configuration[FormRowDescriptor.Configuration.Options] = array.count row.configuration[FormRowDescriptor.Configuration.TitleFormatterClosure] = { value in

var stringArray = String for index in 0...self.array.count { // append index with cast it to string stringArray.append(String(index)) } return stringArray } as TitleFormatterClosure`

however I get an error "Cannot convert return expression of type '[String]' to return type 'String!'" Why does this happen?