ios - 删除可选的 Alamofire(以及任何地方)

Question

我正在尝试在 Swift 中实现新的 REST 服务，但我迷失了。我需要删除服务收据中的“可选”字符串:

func callServiceReceives(){

    var jsonReceived: JSON = []

    Alamofire.request(.GET, "http://localhost:8080/userServicesProvider")
        .responseJSON { (_, _, pruebaJSON, _) in

            jsonReceived = JSON(pruebaJSON!)
            println(jsonReceived["recibos"].array?.count) // "Optional(4)"
    }

}

//  If i try if let temp:String! = String(stringInterpolationSegment: jsonReceived["recibos"].array?.count) {
//  println(temp) -> "Optional(4)"
//  } -> say me "Bound value in a conditional binding must be of Optional type"

//If i try ->     let temp:String! = String(stringInterpolationSegment: jsonReceived["recibos"].array?.count)
//
//                if let temp2 = temp!{
//                    println(temp2) -> "Optional(4)"
//} -> i had the same problem: "Bound value in a conditional binding must be of Optional type"

你能帮帮我吗？

非常感谢

Answer 1

您将 ! 放在了错误的位置。它应该在这里:

println(jsonReceived["recibos"].array?.count!)

不过，为了安全起见，您最好:

println(jsonReceived["recibos"].array?.count.map{String($0)} ?? "Error")

如果你的数组为 nil，这将打印“错误”，或者:

jsonReceived["recibos"].array?.count.map(println)

如果您的数组为零，则不会打印任何内容。