How to convert array of integer inside string to array of string?

Question

I have a dictionary of [String : Any] in which one of the value is of type array of Int. Its look something like this:

 "file_name" : "anImage.png"
 "type" : "2"
 "data_bytes" : "[-119,80,78,71,13,10,26,10,0,13,73,72,68,82,0,0,2,0,2,0,8,6,-12,120,-4]"

Now i am trying to get the value against the key data_bytes as integer array but compiler is saying that i can't cast String to Array or something other. I tried by following codes:

dictionary["data_bytes"] as? [Int]      //Failed
dictionary["data_bytes"] as? [NSNumber] //Failed
dictionary["data_bytes"] as? Array    //Failed
dictionary["data_bytes"] as? [Int8]     //Failed
dictionary["data_bytes"] as? String     //Success

I also tried looping through all characters in string:

 (dictionary["data_bytes"] as? String).flatMap( Int($0) ?? 0 ) //Failed

But its giving exception because while looping, there are characters like [ ] , that is not convertible.

How am I supposed to convert this to array of integers?

Simple JSON rule: Everything wrapped in double quotes is String, one string. Everything , there is no exception. — vadian
– vadian, Commented Apr 18, 2019 at 11:44

Shehata Gamal · Accepted Answer · 2019-04-18 11:33:36Z

5

This is a json string

if let str =  dictionary["data_bytes"] as? String {

     do { 
         let res = try JSONDecoder().decode([Int].self,from:Data(str.utf8))
         print(res)
     }
     catch {
         print(error)
     } 

}

answered Apr 18, 2019 at 11:33

Shehata Gamal

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2 Comments

Kamran Over a year ago

@Jamil Please mark the answer accepted if it worked to help others identify the correct answer.

user28434'mstep Over a year ago

@Jamil, that string was valid JSON array of numbers, so it could be trivially parsed using JSONDecoder

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