Question

我需要将一些参数传递给Web服务，但也可以随附

BindingSource

petDict

的控制台

if let birthYear = objPet?.birthYear {
        petDict = ["name": (objPet!.name!),
                   "birth_year": birthYear,
                   "gender": 1,
                   "breed": "test"]
    }

我想＆＃34; birth_year＆＃34; =＆＃34; 2000＆＃34; 。我怎么能这样做。

类

{
    "birth_year" = "Optional(\"2000\")";
    breed = test;
    gender = 1;
    name = 2323;
}

Answer 1

将其更改为：

if let pet = objPet {
   if let birthYear = pet.birthYear {
        petDict = ["name": (pet.name!),
                   "birth_year": birthYear,
                   "gender": 1,
                   "breed": "test"]
    }
}

应该帮助

编辑：你应该安全地解开pet.name

Answer 2

您的问题不在于如何解开birthYear。您的问题是String属性的Pet对象中存储的birthYear字面上是"Optional(2000)"。

您正在寻找问题根源的错误位置。您需要首先查看创建Pet对象的代码。

我在Playground中重新创建了您的问题：

class Pet: NSObject {
    var name : String?
    var birthYear : String?
    var birthMonth : String?
    var gender : String?
    var breed : String?
}

let objPet: Pet? = Pet()

objPet?.name = "Fido"

let year: Int? = 2000
objPet?.birthYear = "\(year)"   // you have something like this somewhere

if let birthYear = objPet?.birthYear {
    let petDict = ["name": (objPet!.name!),
               "birth_year": birthYear,
               "gender": 1,
               "breed": "test"]
    print(petDict)
}

输出：

{
    "birth_year" = "Optional(2000)";
    breed = test;
    gender = 1;
    name = Fido;
}

如果您将objPet?.birthYear = "\(year)"更改为objPet?.birthYear = "\(year!)"，则"Optional"会消失。这表明问题在于String存储在对象中，而不是在您创建String时展开petDict的方式。

删除可选字符串形式字典

2 个答案: