CODEWITHSUNDEEP
iosswiftswift2
cristan lika
cristan lika

Reputation: 425

cell variable is nil where value was set collectionview index path

i spend lot of time .. but i can't figure out why it is not working .. cell for index path called and set value properly but cell class i found nil value .. if your need any information then let me know .

in my collectionview index path

enter image description here

in collectionview cell

enter image description here

here is my code :

for collectionview :

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: menuBarItemDetailId, for: indexPath) as! MenuBarItemDetail
        cell.shopCategory = "600"
        print(cell.shopCategory)
        return cell
    }

for cell :

class MenuBarItemDetail: UICollectionViewCell , UITableViewDataSource , UITableViewDelegate {
    var shopCategory : String?

    override init(frame: CGRect) {
        super.init(frame: frame)

         print("shopCategory :-> ...i am calling from cell :\(shopCategory)")
}

Upvotes: 3

Views: 931

Answers (2)

dahiya_boy
dahiya_boy

Reputation: 9503

Because your awakeFromNib method called first and then cellForRow .You are assigning the value of variable in cellForRow so when first project executes its value is nil.

Solution

  1. your variable in your custom cellclass

    var myVar : String?

  2. Create a method in your custom cellclass

    func myMethod(str : String){
    myVar = str
    print("var : \(myVar)")        
}

  3. in cellForItem, call your function like this

    cell.myMethod(str: "343")

Output

enter image description here

Upvotes: 5

Abhishek Sharma
Abhishek Sharma

Reputation: 475

When you are writing 

let cell = collectionView.dequeueReusableCell(withReuseId`entifier: "MenuBarItemDetail", for: indexPath) as! MenuBarItemDetail`

At that time "override init(frame: CGRect)" is called. and no value is assigned to shopCategory at the time of init that's the reason you are getting nil.

Add a function "getShopCategory" into MenuBarItemDetail and when every you want to access the value of shopCategory you can get that using getShopCategory function.

import Foundation
import UIKit

    class MenuBarItemDetail: UICollectionViewCell  {
        var shopCategory : String?

        func  getShopCategory()  {
         print("shopCategory :-> ...i am calling from cell :\(shopCategory)")
        }


    }

Controller Class 

 func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "MenuBarItemDetail", for: indexPath) as! MenuBarItemDetail
        cell.shopCategory = "600"
        print(cell.shopCategory)
        cell.getShopCategory()
        return cell
    }

cell is the current instance of MenuBarItemDetail so it will return assigned value of shopCategory

Please let me know if it's working for you. Thank you

Upvotes: 3

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