How to convert AnyObject type to Int in Swift

Question

I am searching a key in an Array of Dictionarys and I want to convert the result value into an Int value. This is what I tried.

if let result = lasrIDArray.flatMap( {$0["\(self.selectedTitle)"]} ).first {      
    print(result)

    if let number = result as? NSNumber {
        let tag = number.integerValue
        let currentScroll = view.viewWithTag(Int(api.selectedCatID)!) as! UIScrollView
        let lastImgVw = currentScroll.viewWithTag(tag) as! UIImageView
        print(lastImgVw.frame.origin.y)
    }
}

But if let number = result as? NSNumber doesn't work as expected. What is the correct way to convert this value?

In response are you getting `String` or `Int` please check that? — Nirav D, Jul 14 '16 at 08:50
var num = Int(result) if num != nil { println("Valid Integer") } else { println("Not Valid Integer") } — Subin K Kuriakose, Jul 14 '16 at 08:50
@SubinKKuriakose cannot invoke initializer for type Int with an argument list of type (AnyObject) at var num = Int(result) — Irrd, Jul 14 '16 at 09:16

score 18 · Accepted Answer · edited Jun 20 '20 at 09:12

18

I don't know your code but this will be helpful for you.

You can get your AnyObject value in this way...

let data :AnyObject = "100"
let score = Int(data as! String)! //Force Unwrap optional value it will be dengerious for nil condition.
print(score)

Or try this way also

let hitCount = "100"
let data :AnyObject = hitCount as AnyObject //sometime Xcode will ask value type
let score = Int(data as? String ?? "") ?? 0
print(score)

Output -

Swift 3.1 & Swift 4

let hitCount = "100"
let data :Any = hitCount //Any type Value passing here 
let score = Int(data as? String ?? "") ?? 0
print(score)

Output -

edited Jun 20 '20 at 09:12

Community

1
1

answered Jul 14 '16 at 09:16

Anand Nimje

6,163
4
24
43

1

So whats the best way for get optional value to non optional. Tell me @dfri ?? – Anand Nimje Jul 14 '16 at 11:49
2

Read [this excellent canonical answer](http://stackoverflow.com/a/32170457/4573247) on the subject. Quote: _"As a general rule, **you should never explicitly force unwrap an optional** with the ! operator"_. – dfrib Jul 14 '16 at 11:59
1

@dfri In your `Or try this way also`: if the `data:Anyobject`'s value is "abc",could use your method? – aircraft Nov 10 '16 at 08:27
@aircraft I'm sorry, I don't follow. What do you mean by "in _your_ `Or try this way also`"? Note that the thread I linked to is a (great) canonical answer on optionals in general, but I'm not the one who has written it. – dfrib Nov 10 '16 at 10:43
It takes a lot of conversions to get what is asked. Why is that Swift!!.. – Dearwolves Feb 20 '17 at 09:23

score 1 · Answer 2 · answered Jul 14 '16 at 19:34

If your data is decoded from JSON string, it will be decoded as NSNumber or NSString.

You can use this function:

func intValueForKey(key: String, inDictionary dictionary: [String: AnyObject]) throws -> Int {
    if let value = dictionary[key]?.integerValue {
        return value
    } else {
        throw NSError(domain: "Invalid key", code: -1, userInfo: nil)
    }
}

score 0 · Answer 3 · answered Jul 14 '16 at 10:31

Here i have given example to convert Anyobject to Int and String

var idInt : Int = 0
if let ids: AnyObject = responseDict["id"] {
    if let idsInt = ids as? Int{
        idInt  = idsInt
        print(idInt)
    }
}


var nameString : String = ""
    if let name: AnyObject = responseDict["name"] {
        if let nameStr = name as? String{
            nameString  = nameStr
            print(nameString)
        }
    }

How to convert AnyObject type to Int in Swift

3 Answers3

Output -

Swift 3.1 & Swift 4

Output -

Linked