数组值的快速json字符串转换为[UInt8]

Question

I have a json string:

let msg={\"type\":\"PONG\",\"content\":[52,55,49,56,51,54,56,56,55,46,57,52,54,55,57,50]}

and I use following code to parse:

let receiveMsg = try NSJSONSerialization.JSONObjectWithData(NSString(string: msg!).dataUsingEncoding(NSUTF8StringEncoding)!, options: NSJSONReadingOptions.MutableContainers) as! NSMutableDictionary

then I could get the type by:

let type = receiveMsg["type"]?.stringValue

I want to try the same way to get the array value by:

let content=receiveMsg["content"] as? [UInt8]

but unfortunately it fails.

Answer 1

The value of the key content is an array of Int .

You can convert it to [UInt8] with the map function

let content = receiveMsg["content"] as! [Int]
let contentUInt8 = content.map{UInt8($0)}