Displaying array of a class in tableView cell - ios

Question

I declared a class with all the variables in it.
class Xyz
{
var a: String?
var b: String?
}
In other viewController, I am declaring an array of that class.
var arr = [Xyz]()
var arr2 = ["title1","title2"]
After Json Parsing, I am appending the values in this array.
var temp = Xyz()
var dict = item as! NSDictionary
temp.a = (dict.value(forKey: "a") as? String) ?? ""
temp.b = (dict.value(forKey: "b") as? String) ?? ""
self.arr.append(temp)
How should I display this array in a cell?
cell.textLabel?.text = arr2[indexPath.row]
//The above array shows the title of the row
cell.detailTextLabel?.text = String(describing: arr[indexPath.row])
//indexPath doesn't work here (error: indexPath out of range)
//The reason is the 'arr' array has class in it
The above statement gives error as the array has class in it and not the values.
cell.detailTextLabel?.text = String(describing: arr[0].a)
cell.detailTextLabel?.text = String(describing: arr[0].b)
is the only way I can access my values.
Due to which I am unable to display this array in my tableView.
How to display the content of the array on a tableView cell(each on separate cell)?

Answer 1

There are many mistakes / bad programming habits in the code.
First of all name the class starting with a capital letter and declare the properties non-optional because they are going to contain non-optional values. (Declaring optionals as an alibi not to write an initializer is one of the bad habits.)
Include the title of the row from arr2 as title property in the class, that avoids any out of range exception.
class Xyz
{
var a : String
var b : String
var title : String
init(a: String, b: String, title: String) {
self.a = a
self.b = b
self.title = title
}
}
Declare the data source array
var arr = [Xyz]() // `var arr: [xyz]()` does not compile
Populate the data source array
let dict = item as! [String:Any] // Swift Dictionary !!
let temp = Xyz(a: dict["a"] as? String) ?? "", b: dict["b"] as? String) ?? "", title: "title1")
self.arr.append(temp) // `self.arr.append(value)` does not compile
In cellForRow get the Xyz instance from the array and use the properties
let item = arr[indexPath.row]
cell.textLabel?.text = item.title
cell.detailTextLabel?.text = item.a + " " + item.b
Since all properties are strings anyway, all String(describing initializers (create String from String) are nonsensical.

Answer 2

It seems like you want to display your class properties
Replace the line
cell.detailTextLabel?.text = String(describing: arr[indexPath.row])
With
cell.detailTextLabel?.text = "\(arr[indexPath.row].a) \(arr[indexPath.row].b)"

Answer 3

I went through all the below answers. But none of them produced the solution. The problem in all solution is the array is printed on same cell, leaving the other cell empty(including the answer provided by Vadian - it will give error because it is printing all the value in same row.). While printing an array on a cell, you have to go in a loop, But none of the answers provides that. This will give error back Index out of range .The best solution I came across is to use switch or enum. Due to switch or enum you can put a condition for every row and according to that you can print the item from the array. Here I put the simple array item "title" as case and according to that printed the array of class.
Solution:- The following code helped me to achieve what I asked.
Note:- enum is more preferred than switch. I used switch because easy to understand and got my work done.
let a = arr2[indexPath.row]
let item = arr[0]
switch a
{
case "title1":
cell.detailTextLabel?.text = item.a
return cell
case "title2" :
cell.detailTextLabel?.text = item.b
return cell
default:
break
}