ios - MVC model compliance -

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i have app writes lot of data coredata db interrogate , give feedback based on user queries.

for have db actions in vc , move separate file called modeldb.

// mark: outlets @iboutlet weak var coursefield: uitextfield! @iboutlet weak var par3field: uitextfield! @iboutlet weak var par4field: uitextfield! @iboutlet weak var par5field: uitextfield! @iboutlet weak var errorlabel: uilabel!  // mark: actions @ibaction func addnewcourse(sender: anyobject) {    let appdel: appdelegate = uiapplication.sharedapplication().delegate as! appdelegate    let context: nsmanagedobjectcontext = appdel.managedobjectcontext    let newcourse = nsentitydescription.insertnewobjectforentityforname("coursedb", inmanagedobjectcontext: context)    newcourse.setvalue(coursefield.text, forkey: "coursename"   newcourse.setvalue(int(par3field.text!), forkey: "totalpar3")   newcourse.setvalue(int(par4field.text!), forkey: "totalpar4")   newcourse.setvalue(int(par5field.text!), forkey: "totalpar5")    {      try context.save()     performseguewithidentifier("back", sender: self)    } catch {      errorlabel.text = "data not saved"    }  }

from above can see i'm writing data db rather want in modeldb file , pass vc.

can please give me pointers on how achieve this?

new information & needed created global array capture , pass information contained in uitextfields:

newcourselist = [coursefield.text!, par3field.text!, par4field.text!, par5field.text!] modeldb.addnewcoursetodb(newcourselist)

when running fatal error "fatal error: unexpectedly found nil while unwrapping optional value", although array has 4 values.

the func pass to, inside modeldb class, looks this:

    func addnewcoursetodb(_: [string]) {                  let appdel: appdelegate = uiapplication.sharedapplication().delegate as! appdelegate                  let context: nsmanagedobjectcontext = appdel.managedobjectcontext     // code     }

but code not reach stage because of error. how fix passing of array?

in order communicate modeldb class (assuming class), add property view controller. way establish relationship:

var modeldb: modeldb!

regarding managing communication modeldb controller, there number of ways this, described in objc.io issue:

https://www.objc.io/issues/7-foundation/communication-patterns/


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