Cannot assign value of type 'String.Type' to type 'String?' - Swift

Question

I am trying to populate my tableView with data from within an array, However when I try to assign the text of the Cell to the items in the array I keep getting the error:

Cannot assign value of type 'String.Type' to type 'String?

Here's my code as it stands, I've tried a few other ways but this one seems like it's the closest one.

class ContactViewController: UIViewController, UITableViewDataSource {

  var contact:[Contacts]=[]

  struct Contacts {
     let name = String.self;
  }

  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath)
        let contacts = contact[indexPath.row]
        cell.textLabel?.text = contacts.name //This is where I get the error
        return cell
   }
}

Define structure like this struct Contacts {let name: String} — Hitesh Surani
– Hitesh Surani, Commented May 14, 2019 at 5:04
Unrelated but semantically you should name the struct Contact and the variable contacts. var contact:[Contacts]=[] and let contacts = contact[indexPath.row] is pretty confusing. — vadian
– vadian, Commented May 14, 2019 at 5:06

Tobias Tikka · Accepted Answer · 2019-05-14 05:07:05Z

5

When you write "=" you're assigning a value, so when writing

let name = String.self

you're assigning the type of String to name. If you want to declare the type of a variable you should use semi-colon;

struct Contact {
  var name: String
}

If you quickly wants to populate your array with data just for testing, you can write:

struct Contact {
    var name: String
}

class ContactViewController: UIViewController, UITableViewDataSource {

  var contacts = [
      Contact(name: "First Contact"),
      Contact(name: "Second Contact"),
      Contact(name: "Third Contact")
  ]

  func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CustomCell", for: indexPath)
        let contact = contacts[indexPath.row]
        cell.textLabel?.text = contact.name //This is where I get the error
        return cell
   }
}

answered May 14, 2019 at 5:07

Tobias Tikka

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1 Comment

Tariq Khan Over a year ago

This fixed my issue! The problem was indeed in the way I was declaring my name string in the struct :)

Chris Shaw · Accepted Answer · 2019-05-14 04:57:22Z

0

You're not showing how you populate the array of Contacts, but the struct isn't declared correctly.

Presumably you want a struct that contains a name as a string. That would be declared such as:-

struct Contacts
{
  let name : String
}

Or with name declared with var instead of let if it needs to be variable.

answered May 14, 2019 at 4:57

Chris Shaw

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