Passing data from model to controller












2















I am wondering what would be the best practice when I want to pass data from model to controller.



What I want to do

I would like to update a label when the time changes.



CurrentTime.swift (Model)



var timer: Timer?
var currentTime: String?

init() {
if timer == nil{
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateCurrentTime), userInfo: nil, repeats: true)
}
}

@objc private func updateCurrentTime(){
let df = DateFormatter()
df.dateFormat = "HH:mm"
df.timeZone = TimeZone.current
let timezoneDate = df.string(from: Date())
currentTime = timezoneDate
}


ViewController.swift



class ViewController: UIViewController {

@IBOutlet var timeLabel: UILabel!
var currentTime = CurrentTime()

override func viewDidLoad() {
}

@IBAction func closeBtnWasPressed(_ sender: UIButton) {
dismiss(animated: true, completion: nil)
}
}









share|improve this question























  • You can post a Notification or provide a way to register observer closures with your model. You should set up the date formatter as a lazy private property rather than creating it each time the timer fires. Dateformatters are relatively expensive to create.

    – Paulw11
    Nov 24 '18 at 12:59
















2















I am wondering what would be the best practice when I want to pass data from model to controller.



What I want to do

I would like to update a label when the time changes.



CurrentTime.swift (Model)



var timer: Timer?
var currentTime: String?

init() {
if timer == nil{
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateCurrentTime), userInfo: nil, repeats: true)
}
}

@objc private func updateCurrentTime(){
let df = DateFormatter()
df.dateFormat = "HH:mm"
df.timeZone = TimeZone.current
let timezoneDate = df.string(from: Date())
currentTime = timezoneDate
}


ViewController.swift



class ViewController: UIViewController {

@IBOutlet var timeLabel: UILabel!
var currentTime = CurrentTime()

override func viewDidLoad() {
}

@IBAction func closeBtnWasPressed(_ sender: UIButton) {
dismiss(animated: true, completion: nil)
}
}









share|improve this question























  • You can post a Notification or provide a way to register observer closures with your model. You should set up the date formatter as a lazy private property rather than creating it each time the timer fires. Dateformatters are relatively expensive to create.

    – Paulw11
    Nov 24 '18 at 12:59














2












2








2








I am wondering what would be the best practice when I want to pass data from model to controller.



What I want to do

I would like to update a label when the time changes.



CurrentTime.swift (Model)



var timer: Timer?
var currentTime: String?

init() {
if timer == nil{
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateCurrentTime), userInfo: nil, repeats: true)
}
}

@objc private func updateCurrentTime(){
let df = DateFormatter()
df.dateFormat = "HH:mm"
df.timeZone = TimeZone.current
let timezoneDate = df.string(from: Date())
currentTime = timezoneDate
}


ViewController.swift



class ViewController: UIViewController {

@IBOutlet var timeLabel: UILabel!
var currentTime = CurrentTime()

override func viewDidLoad() {
}

@IBAction func closeBtnWasPressed(_ sender: UIButton) {
dismiss(animated: true, completion: nil)
}
}









share|improve this question














I am wondering what would be the best practice when I want to pass data from model to controller.



What I want to do

I would like to update a label when the time changes.



CurrentTime.swift (Model)



var timer: Timer?
var currentTime: String?

init() {
if timer == nil{
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateCurrentTime), userInfo: nil, repeats: true)
}
}

@objc private func updateCurrentTime(){
let df = DateFormatter()
df.dateFormat = "HH:mm"
df.timeZone = TimeZone.current
let timezoneDate = df.string(from: Date())
currentTime = timezoneDate
}


ViewController.swift



class ViewController: UIViewController {

@IBOutlet var timeLabel: UILabel!
var currentTime = CurrentTime()

override func viewDidLoad() {
}

@IBAction func closeBtnWasPressed(_ sender: UIButton) {
dismiss(animated: true, completion: nil)
}
}






ios swift model-view-controller






share|improve this question













share|improve this question











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asked Nov 24 '18 at 12:43









Tech IRISTech IRIS

237




237













  • You can post a Notification or provide a way to register observer closures with your model. You should set up the date formatter as a lazy private property rather than creating it each time the timer fires. Dateformatters are relatively expensive to create.

    – Paulw11
    Nov 24 '18 at 12:59



















  • You can post a Notification or provide a way to register observer closures with your model. You should set up the date formatter as a lazy private property rather than creating it each time the timer fires. Dateformatters are relatively expensive to create.

    – Paulw11
    Nov 24 '18 at 12:59

















You can post a Notification or provide a way to register observer closures with your model. You should set up the date formatter as a lazy private property rather than creating it each time the timer fires. Dateformatters are relatively expensive to create.

– Paulw11
Nov 24 '18 at 12:59





You can post a Notification or provide a way to register observer closures with your model. You should set up the date formatter as a lazy private property rather than creating it each time the timer fires. Dateformatters are relatively expensive to create.

– Paulw11
Nov 24 '18 at 12:59












2 Answers
2






active

oldest

votes


















1














Option 1



1- Add this var



weak var delegate: ViewController?


2- in viewDidLoad of the vc



currentTime.delegate = self


3-



let timezoneDate = df.string(from: Date())
currentTime = timezoneDate
delegate?.update(currentTime)


4- inside the vc



func update(_ data:String) {
lbl.text = data
}


off course you can do



delegate?.lbl.text = currentTime


but above is MVC



Option 2



var ob:NSKeyValueObservation!


and in viewDidLoad



ob =  currentTime.observe(CurrentTime.currentTime, options: .new) { cur, tex in
timeLabel.text = tex
}





share|improve this answer

































    1














    You should define a Dynamic class like this:



    class Dynamic<T> {

    var bind: (T) -> Void = { _ in }

    var value: T? {
    didSet {
    bind(value!)
    }
    }

    init(_ v: T) {
    value = v
    }
    }


    In your model change definition of the currentTime property like this:



    var currentTime: Dynamic<String>


    In your controller in viewDidLoad method add these codes:



    yourModel.currentTime.bind = { [weak self] time in
    self?.timeLabel.text = time
    }





    share|improve this answer























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      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      1














      Option 1



      1- Add this var



      weak var delegate: ViewController?


      2- in viewDidLoad of the vc



      currentTime.delegate = self


      3-



      let timezoneDate = df.string(from: Date())
      currentTime = timezoneDate
      delegate?.update(currentTime)


      4- inside the vc



      func update(_ data:String) {
      lbl.text = data
      }


      off course you can do



      delegate?.lbl.text = currentTime


      but above is MVC



      Option 2



      var ob:NSKeyValueObservation!


      and in viewDidLoad



      ob =  currentTime.observe(CurrentTime.currentTime, options: .new) { cur, tex in
      timeLabel.text = tex
      }





      share|improve this answer






























        1














        Option 1



        1- Add this var



        weak var delegate: ViewController?


        2- in viewDidLoad of the vc



        currentTime.delegate = self


        3-



        let timezoneDate = df.string(from: Date())
        currentTime = timezoneDate
        delegate?.update(currentTime)


        4- inside the vc



        func update(_ data:String) {
        lbl.text = data
        }


        off course you can do



        delegate?.lbl.text = currentTime


        but above is MVC



        Option 2



        var ob:NSKeyValueObservation!


        and in viewDidLoad



        ob =  currentTime.observe(CurrentTime.currentTime, options: .new) { cur, tex in
        timeLabel.text = tex
        }





        share|improve this answer




























          1












          1








          1







          Option 1



          1- Add this var



          weak var delegate: ViewController?


          2- in viewDidLoad of the vc



          currentTime.delegate = self


          3-



          let timezoneDate = df.string(from: Date())
          currentTime = timezoneDate
          delegate?.update(currentTime)


          4- inside the vc



          func update(_ data:String) {
          lbl.text = data
          }


          off course you can do



          delegate?.lbl.text = currentTime


          but above is MVC



          Option 2



          var ob:NSKeyValueObservation!


          and in viewDidLoad



          ob =  currentTime.observe(CurrentTime.currentTime, options: .new) { cur, tex in
          timeLabel.text = tex
          }





          share|improve this answer















          Option 1



          1- Add this var



          weak var delegate: ViewController?


          2- in viewDidLoad of the vc



          currentTime.delegate = self


          3-



          let timezoneDate = df.string(from: Date())
          currentTime = timezoneDate
          delegate?.update(currentTime)


          4- inside the vc



          func update(_ data:String) {
          lbl.text = data
          }


          off course you can do



          delegate?.lbl.text = currentTime


          but above is MVC



          Option 2



          var ob:NSKeyValueObservation!


          and in viewDidLoad



          ob =  currentTime.observe(CurrentTime.currentTime, options: .new) { cur, tex in
          timeLabel.text = tex
          }






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 24 '18 at 13:06

























          answered Nov 24 '18 at 12:57









          Sh_KhanSh_Khan

          40.8k51125




          40.8k51125

























              1














              You should define a Dynamic class like this:



              class Dynamic<T> {

              var bind: (T) -> Void = { _ in }

              var value: T? {
              didSet {
              bind(value!)
              }
              }

              init(_ v: T) {
              value = v
              }
              }


              In your model change definition of the currentTime property like this:



              var currentTime: Dynamic<String>


              In your controller in viewDidLoad method add these codes:



              yourModel.currentTime.bind = { [weak self] time in
              self?.timeLabel.text = time
              }





              share|improve this answer




























                1














                You should define a Dynamic class like this:



                class Dynamic<T> {

                var bind: (T) -> Void = { _ in }

                var value: T? {
                didSet {
                bind(value!)
                }
                }

                init(_ v: T) {
                value = v
                }
                }


                In your model change definition of the currentTime property like this:



                var currentTime: Dynamic<String>


                In your controller in viewDidLoad method add these codes:



                yourModel.currentTime.bind = { [weak self] time in
                self?.timeLabel.text = time
                }





                share|improve this answer


























                  1












                  1








                  1







                  You should define a Dynamic class like this:



                  class Dynamic<T> {

                  var bind: (T) -> Void = { _ in }

                  var value: T? {
                  didSet {
                  bind(value!)
                  }
                  }

                  init(_ v: T) {
                  value = v
                  }
                  }


                  In your model change definition of the currentTime property like this:



                  var currentTime: Dynamic<String>


                  In your controller in viewDidLoad method add these codes:



                  yourModel.currentTime.bind = { [weak self] time in
                  self?.timeLabel.text = time
                  }





                  share|improve this answer













                  You should define a Dynamic class like this:



                  class Dynamic<T> {

                  var bind: (T) -> Void = { _ in }

                  var value: T? {
                  didSet {
                  bind(value!)
                  }
                  }

                  init(_ v: T) {
                  value = v
                  }
                  }


                  In your model change definition of the currentTime property like this:



                  var currentTime: Dynamic<String>


                  In your controller in viewDidLoad method add these codes:



                  yourModel.currentTime.bind = { [weak self] time in
                  self?.timeLabel.text = time
                  }






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 24 '18 at 13:01









                  Hasti RanjkeshHasti Ranjkesh

                  219112




                  219112






























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