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iOS Build a Simple iPhone App with Swift 2.0 Structs as Data Models Structs or Classes

Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points
Posted by Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points

" Class ViewController has no initializers " I am getting this error in my code (the same code with video)

firstly, I am writing the same code with video and the code is giving error, I realized that it is logical because our ViewController class has no init method. But it must have.

secondly, when I write let factModel: FactModel() it is giving error, when I get rid of parenthesis . it says okay like ( let factModel: FactModel )

8 Answers

Steven Deutsch
Steven Deutsch
21,046 Points
Steven Deutsch
Steven Deutsch
21,046 Points

Hey Erman Sahin Tatar, Did you create your FactModel as a Swift File or a Cocoa Touch Class? It needs to be a Swift File. 

// To create an instance of your FactModel structure, you need to write:
let factModel = FactModel()

Could you post your code for your ViewController and your FactModel so that I can try and help you?

Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points
Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points

Yes, I created as a swift file, but interesting point is that compiler true class must have init method inside them. I cannot understand the code in the video should not work too.

Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points
Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var funFactLabel: UILabel!
let factModel: FactModel

override func viewDidLoad() {
    super.viewDidLoad()

    funFactLabel.text = factModel.facts[0]

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


@IBAction func showFunFact() {

    funFactLabel.text = factModel.facts[1]
}

}

Steven Deutsch
Steven Deutsch
21,046 Points
Steven Deutsch
Steven Deutsch
21,046 Points

Hey Erman Sahin Tatar,

@IBOutlet weak var funFactLabel: UILabel!

// Change this
let factModel: FactModel
// To this
let factModel = FactModel()

override func viewDidLoad() {
    super.viewDidLoad()

    funFactLabel.text = factModel.facts[0]

}

Then let me know what's still not working

Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points
Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points

struct FactModel {

let facts = ["Ants stretch when they wake up in the morning",
    "Ostritches can run faster than horses",
    "Olympic gold medals are actually made mostly of silver",
    "Your are born with 300 bones; by the time you are adult you will have 206",
    "Some bamboo plants can grow almost a meter in just one day",
    "The state florida is bigger than England",
    "Some penguins can leap 2-3 meters out of the water"]

}

Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points
Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points

I know normally I did like you but it gave me another error (let factModel = FactModel() giving error )

Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points
Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points

The main problem is Every class must have init method but here we haven't like in the video but how the code in video can work because there is no init method in ViewController class

Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points
Erman Sahin Tatar
Erman Sahin Tatar
3,223 Points

God! thanks it is about equal sign thank you very much!

Steven Deutsch
Steven Deutsch
21,046 Points
Steven Deutsch
Steven Deutsch
21,046 Points

No problem. I thought that's what it was!

Arman Arutyunov
Arman Arutyunov
21,900 Points
Arman Arutyunov
Arman Arutyunov
21,900 Points

I also have an error and plus my simulator doesn't show anything. Just clean white screen.

I can show the code

This is my FactsModel.swift

//
//  FactsModel.swift
//  FunFacts
//
//  Created by Arman on 14/03/16.
//  Copyright © 2016 Treehouse. All rights reserved.
//

struct FactModel {
    let facts = [
        "Ants stretch when they wake up in the morning.",
        "Ostriches can run faster than horses.",
        "Olympic gold medals are actually made mostly of silver.",
        "You are born with 300 bones; by the time you are an adult you will have 206.",
        "It takes about 8 minutes for light from the Sun to reach Earth.",
        "Some bamboo plants can grow almost a meter in just one day.",
        "The state of Florida is bigger than England.",
        "Some penguins can leap 2-3 meters out of the water.",
        "On average, it takes 66 days to form a new habit.",
        "Mammoths still walked the Earth when the Great Pyramid was being built." ]
}

And this is ViewController.swift

//
//  ViewController.swift
//  FunFacts
//
//  Created by Arman on 13/03/16.
//  Copyright © 2016 Treehouse. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var funFactLabel: UILabel!
    let factModel = factModel()

    override func viewDidLoad() {
        super.viewDidLoad()
        funFactLabel.text = factModel.facts[0]
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func showFunFact() {

        funFactLabel.text = factModel.facts[1]
    }

}

Actually I have an error in ViewController.swift on line 14

let factModel = factModel()

which says "Variable used within its own initial value"

Does anybody know what does it mean? Pasan's code is the same but he doesn't have an error and the simulator works fine

Nicholai Hansen
Nicholai Hansen
2,395 Points
Nicholai Hansen
Nicholai Hansen
2,395 Points

Arman,

Try changing --> let factModel = factModel() TO factModel = FactModel() <-- You want to make sure the struct, FactModel, is capitalized so that when you assign the constant, factModel, to the strings inside of the struct, they don't read as exactly the same value.