Convert array to string? in Swift

Question

I am working with the ActionSheetPicker 3.0 (https://github.com/skywinder/ActionSheetPicker-3.0) picker and am having a newbie problem of working with the return values from the ActionSheetMultipleStringPicker. I've got the control running and can return values from it, but I want to be able to put the return values from the picker into separate variables or into something that I can join together. I've found numerous examples, but can't figure out how to get them to work.

What I think I've found through debugging is that ActionSheetMultipleStringPicker returns an array of Any?.

Debugging shows the following:

values Any? some payload_data_0 Builtin.RawPointer 0x60800044fdb0 0x000060800044fdb0 -> 0x000000010dacddd8 (void *)0x000000010dacdf18: __NSArrayI payload_data_1 Builtin.RawPointer 0x335392d30 0x0000000335392d30 payload_data_2 Builtin.RawPointer 0x10d28d798 0x000000010d28d798 libobjc.A.dylib`objc_retainAutoreleasedReturnValue + 35 instance_type Builtin.RawPointer 0x60800005d5c8 0x000060800005d5c8

values is the return value from the picker.

A couple things that I've tried are:

let stringText: String? = String(describing: values)
print(stringText)

This prints:

Optional("Optional(<__NSArrayI 0x60800044be20>(\nOne,\nMany,\naaa\n)\n)")

I've also tried:

print("\(values as! NSArray)")

This is the closest I've gotten to the results I'm looking for which is:

( One, Many, aaa )

Can anyone provide some assistance getting the value of 'values' into something that I can separate into three different string variables?

My code for the picker is:

    let a = ActionSheetMultipleStringPicker.init(title: "Fertilizer Setup", rows: [

        // TODO: Read values from database
        ["One", "Two", "A lot"],
        ["Many", "Many more", "Infinite"],
        ["aaa","sss","ccc","xxxx"]
        ], initialSelection: [0, 0, 0],
           doneBlock: {
               picker, indexes, values in

               let stringText: String? = String(describing: values)

               print(stringText)

               print("\(values as! NSArray)")
    },
           cancel: {ActionMultipleStringCancelBlock in return }, origin: sender)

    a?.setCancelButton(UIBarButtonItem(title: "My own title", style: UIBarButtonItemStyle.plain, target: self, action: nil))
    a?.show()

Option click on values, and you'll see its inferred type. What does it show? — Alexander
– Alexander, Commented Jun 13, 2017 at 16:41
@Yonlif, I did see those posts, but I wasn't able to get the examples to work with my solution. — Jason
– Jason, Commented Jun 13, 2017 at 19:34
@Alexander, Option + Click doesn't show the type. I get a popup that says No Quick Help. I am able to get this though. Printing description of values: ▿ Optional<Any> ▿ some : 3 elements ▿ 0 : One ▿ 1 : Many ▿ 2 : aaa — Jason
– Jason, Commented Jun 13, 2017 at 19:36
So it is an NSArray. Is it an NSArray containing only strings? — Alexander
– Alexander, Commented Jun 13, 2017 at 20:44

Jason · Accepted Answer · 2017-07-07 18:51:38Z

I was able to figure this out. I changed my doneBlock code to be:

doneBlock: {
            picker, indexes, values in
                 let fertilzerPicker:  NSArray = values as! NSArray               
                 self.row.value!.name = fertilzerPicker[0] as! String
                 self.row.value!.amount = fertilzerPicker[1] as! Int
                 self.row.value!.unitOfMeasurement = fertilzerPicker[2] as! String
}

The key line being:

let fertilzerPicker:  NSArray = values as! NSArray

Creating fertilzerPicker allowed me to get the individual elements of the array.

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