如何在Swift中将AnyObject类型转换为Int

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

Answer 1

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 -

Answer 2

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)
    }
}

Answer 3

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)
        }
    }