Cannot convert value of type 'String?.Type' to expected argument type 'String?'

Question

I'm getting the error stated in the title where var updater is declared.

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let destination = segue.destination as? ProductViewController,
            let index = tableViewProducts.indexPathForSelectedRow?.row {

            // Check whether postData array count is greater than index
            let updaterId = postData.count > index ? postData[index] : ""

            // Initialize "productsList" instance and assign the id value and sent this object to next view controller
            var updater = productsList(id: String?, p_name: String?, image: String?, audio: String?)
            updater.id = updaterId
            destination.updater = updater

here is my productsList VC:

import Foundation

class productsList {

    let id: String?
    let p_name: String?
    let image: String?
    let audio: String?

    init(id: String?, p_name: String?, image: String?, audio: String?) {
        self.id = id
        self.p_name = p_name
        self.image = image
        self.audio = audio
    }

}

Exactly at what line you are getting Issue.?

Abhirajsinh Thakore
– Abhirajsinh Thakore

2018-04-02 05:45:15 +00:00
Commented Apr 2, 2018 at 5:45 — Abhirajsinh Thakore
– Abhirajsinh Thakore, Commented Apr 2, 2018 at 5:45

Manish Mahajan · Accepted Answer · 2018-04-02 05:59:00Z

1

Use This

var updater = productsList(id: updaterId, p_name: nil, image: nil, audio: nil)

Instead of

var updater = productsList(id: String?, p_name: String?, image: String?, audio: String?)

answered Apr 2, 2018 at 5:59

Manish Mahajan

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Comments

vadian · Accepted Answer · 2018-04-02 05:45:38Z

1

You have to pass string values (or nil) as the parameters not the type String?, that's what the error says.

Replace

var updater = productsList(id: String?, p_name: String?, image: String?, audio: String?)
updater.id = updaterId

with

let updater = productsList(id: updaterId, p_name: nil, image: nil, audio: nil)

and please conform to the naming convention that class names start with a capital letter.

answered Apr 2, 2018 at 5:45

vadian

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1 Comment

Nadia Solovyeva Over a year ago

Thank you so much. I have been staring at this issue for an hour or so, and only your answer helped me to realize what exactly I was doing!

Devang Tandel · Accepted Answer · 2018-04-02 05:48:02Z

0

This line is causing the issue

var updater = productsList(id: String?, p_name: String?, image: String?, audio: String?)

When you init your Object ie "ProductList" you must pass an actual value of your fileds "id", "p_name", "image" and "audio".

As now you are sending "String?", this is type of argument where your function is expecting a value for it.

So change it like

var updater = productsList(id: ID_OF_PRODUCT, p_name: NAMEOFPRODUCT, image: URLTOIMAGE/IMAGE, audio: AUDIOURL)

answered Apr 2, 2018 at 5:48

Devang Tandel

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