ios - Generic toArray<T> function which can call an init on the Type T -

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i have struct called flowercategory shown below: 

struct flowercategory  {      var id :int?     var title :string     var imageurl :string    }  extension flowercategory {      init?(node :node) {         // here      } }

i creating extension on node class convert node typed class array. problem cannot invoke t.init initializer shown below: 

extension node {      func toarray<t>() -> [t]? {          guard let nodes = self.nodearray else {             return nil         }          return nodes.flatmap(t.init) // not work     }  }

is there anyway trying achieve?

update:

enter image description here


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