Checking if a value in an multidimensional array is equal to a string swift

Question

I am having trouble checking a value in a mutlidimensional array.

I am creating an array within an array with 3 arrays inside.

The array is called profilerdata, the variable "key" is a string so it should just be three stings in these arrays.

The array in my log as a SwiftDeferredNSArray which I think is the first problem as I have read this is a non mutable array.

var newKeyArray = [[key],[String](),[""]]

for thing in dataArray as! [[String: AnyObject]] {
    newKeyArray[1].append("0")
}

print(newKeyArray)
profilerData.append(newKeyArray as AnyObject)

I then try and read the value in the array like so:

var n = 1
while n <= elementArray.count {
    if profilerData[n][0] as! String == headertitle {
        print("it matches")
    } else {
        print("it does not match")
    }

    n += 1
}

The variable "headertitle" is a string too but when this runs I get an error:

Could not cast value of type 'Swift._SwiftDeferredNSArray' (0x104ce8040) to 'NSString' (0x101f97c60).

This error is occuring on this line

if profilerData[n][0] as! String == headertitle {

Any help much appreciated,

p.s. Please explain quite simply as I'm new to Swift.

Can you explain why you're casting newKeyArray to AnyObject? Also, can you quote the error message more accurately and explain what line it occurs on? — matt
– matt, Commented Aug 30, 2017 at 22:31
Ive added those details and i tried to cast it as a String but i get an error "Cannot convert value of type '[[String]]' to type 'String' in coercion" or just leave it append(newKeyArray) which gives me the error "Argument type '[[String]]' does not conform to expected type 'AnyObject'" — Ray
– Ray, Commented Aug 30, 2017 at 22:39

matt · Accepted Answer · 2017-08-30 22:41:16Z

1

Your arrays are one level deeper than you seem to think they are. To see this, try this code, which simplifies what you're doing:

let key = "key"
let newKeyArray = [[key],[String](),[""]]
var profilerData = [Any]()
profilerData.append(newKeyArray)

let oneLevel = profilerData[0] as! Array<Array<String>>
let twoLevel = oneLevel[0] // Array<String>
let threeLevel = twoLevel[0] // String

answered Aug 30, 2017 at 22:41

matt

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4 Comments

Ray Over a year ago

thank you, i was on the right track at one point but was getting a message variable has no subscript so must have been going at it wrong, thank you

matt Over a year ago

Well, that's why I said you need to think about why you're casting to AnyObject. You should not be using AnyObject or Any at all. (I used Any in my example only to show you what you were doing.) Use real types.

Ray Over a year ago

So what should i be using instead as i couldnt seem to use string as it threw an error?

matt Over a year ago

I can't tell you what you "should" do. I have no notion what you're even trying to do. Your code is completely opaque to me. You are making an Array<Array<Array<String>>>. Why anyone would do that beats me totally.

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