如何在解析json而不使用if为每个键时捕获错误？

here is How i parse json:

这是我如何解析json:

let myObject = MyObject()
let string1 = if jsonObject["string1"] as? String{
    myObject.string1 = string1
}else{
  throw InValidJson
}

let string2 = if jsonObject["string2"] as? String{
    myObject.string2 = string2
}else{
  throw InValidJson
}

let string3 = if jsonObject["string3"] as? String{
    myObject.string3 = string3
}else{
  throw InValidJson
}
let