How to join the objects of NSMutableArray with a separator in Swift3

Question

I have got an NSMutableArray declared like as:

var operatingDays = NSMutableArray()

And next i am appending the objects into the array like this :

for operatingDays in forecast.operatingDays! {
              print(operatingDays.days)
              print(operatingDays.times)
              self.operatingDays.add(operatingDays.days)
            }

So the operating days array now contains arrays.

Now i want to convert each array to string separated with a space and to show it to the UITableViewCell. For this i am using the code at cellForRowAtIndexPath like this:

cell.operationalDays.text = (operatingDays[indexPath.row] as AnyObject).joined(separator: " ")

But it shows the error :

Answer 1

As I said in my first comment, casting your operatingDays[indexPath.row] to [String] it works, Try with this

if let arrayOfStrings = operatingDays[indexPath.row] as? [String]
{
  cell.operationalDays.text = arrayOfStrings.joined(separator: " ")
}

Hope this helps

Answer 2

Solution is below:

var operatingDays = [Any]()
cell.operationalDays.text = (operatingDays[indexPath.row] as? [String])?.joined(separator: " ")

or

if let data = operatingDays[indexPath.row] as? [String] {
     cell.operationalDays.text = data.joined(separator: " ")
}

Answer 3

Try to joint array as below:

let tempArr = operatingDays[indexPath.row] as! NSArray
cell.operationalDays.text = tempArr.componentsJoined(by: " ")

Answer 4

Cast AnyObject to Array to use joined function.

if let isArray = operatingDays[indexPath.row] as? [String] {
    //Now you can able to use joined function
    cell.operationalDays.text = isArray.joined(separator: " ")
}