CODEWITHSUNDEEP
arraysswiftuitableview
Osama Hajjar
Osama Hajjar

Reputation: 47

Using two arrays in UITableview swift

I have Two labels in one cell and two arrays in one table view , I want to link Each array with label

list [ ] with la_view and list_2 [ ] with la_view2 , also la_view and la_view2 in one cell in table view

When running the program shows Error As shown .

var list = [String]()
var list_2 = [String]()

func tableView (_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

      return list.count + list_2.count

}

func tableView (_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let cell = tableView.dequeueReusableCell(withIdentifier: "cell_1") as! TableView_Cell
        print("\(list.count)")
        cell.la_view.text = list[indexPath.row]
        cell.la_view2.text = list_2[indexPath.row] // eroor here
        cell.backgroundColor = UIColor(named: "Defeult")
        return cell
}

// This append in arrays
func append(add:Int) {
    list.append("\(add)")
    list_2.append("\(add)")
    let indexPath = IndexPath(row: list.count - 1, section: 0)
    let indexPath2 = IndexPath(row: list_2.count - 1, section: 0)
    table_View.beginUpdates()
    table_View.insertRows(at: [indexPath], with: .automatic)
    table_View.insertRows(at: [indexPath2], with: .automatic)
    table_View.endUpdates()
}

Upvotes: 0

Views: 1307

Answers (1)

vadian
vadian

Reputation: 285280

Don't do that. Don't use multiple arrays as data source

return list.count + list_2.count

causes the error because actually you have only list.count number of items where list.count must be equal to list_2.count. The addition raises an out-of-range exception at row list.count + 1

Use a custom struct

struct Item {
    let foo : String
    let bar : String
}

Then map the two arrays

var items = [Item]()

items = zip(list, list_2).map{ Item(foo:$0.0, bar:$0.1) }

In numberOfRowsInSection return items.count

In cellForRowAt get the value from the Item instance

let item = items[indexPath.row]
cell.la_view.text = item.foo
cell.la_view2.text = item.bar

To append an item use

func append(add:Int) {
    let lastIndex = items.count
    items.append( Item(foo:"\(add)", bar:"\(add)") )
    let indexPath = IndexPath(row: lastIndex, section: 0)
    table_View.insertRows(at: [indexPath], with: .automatic)
}

And please according to the naming convention use lowerCamelCased rather than snake_cased variable names.

Upvotes: 3

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