swift - 为字典中的键分配值的问题

Question

我有一个像这样的字典数组......

[
  {
    "sellingPrice" : "200",
    "transaction_id" : "COD",
    "shipping_charges" : "",
    "id" : "3",
    "payment_method" : "",
    "taxes" : "0",
    "applied_coupon_code" : "",
    "discount_price" : "",
    "quantity" : "13",
    "transaction_type" : "COD",
    "remaining_balance" : "",
    "grand_total" : ""
  },
  {
    "sellingPrice" : "200",
    "transaction_id" : "COD",
    "shipping_charges" : "",
    "id" : "22",
    "payment_method" : "",
    "taxes" : "0",
    "applied_coupon_code" : "",
    "discount_price" : "",
    "quantity" : "3",
    "transaction_type" : "COD",
    "remaining_balance" : "",
    "grand_total" : ""
  }
]

我有一个名为“部分金额”的东西，值为 50。现在，我想遍历字典数组，检查 partial amount 是否小于 sellingPrice，如果小于，则从中减去 partial amount，结果值将分配给键 remaining_balance

所以在这种情况下，将从 200 的第一个 sellingPrice 中减去 50，得到第一个字典的 remaining_balance 的值为 150。因为现在什么都没有了剩余的 partial amount 50 因为它已经完全用完，第二个 remaining_balance 的 sellingPrice 的值为 200。所以第一个 remaining_balance 将为 150，第二个 remaining_balance 将为 200。

这是我到目前为止尝试过的方法..但它似乎不起作用...

for (index, dict) in self.appDelegate.arrayOfDictionary.enumerated() {
    for element in dict {                
        if element.key == "sellingPrice" {
            let PAinTxtField =  alertController.textFields?.first?.text)!
            var thePA = (Int(PAinTxtField ) ?? 0) //This is partial amount

            let theSP = (Int("\(element.value)") ?? 0) //This is selling price
            if thePA < theSP {
                self.remainingAmt = theSP - thePA
                var dictCopy = dict
                dictCopy["remaining_balance"] = "\(self.remainingAmt)" //The mistake seems to be because of this line. But cannot figure out what exactly...:(

            }
        }
    }
}

Answer 1

试试这个:

self.appDelegate.arrayOfDictionary[index] = dictCopy //replace new copyDict with old dict