Question

我收到如下服务响应

[["realms": ({
        authorizationType = External;
        contentPageId = "<null>";
        description = "Demo accounts";
        externalRegistrationUrl = "<null>";
        id = 1;
        identifier = Demo;
        showDuringSignup = 1;
    }), "identifier": MENIISRE, "name": MegaTest, "imageData": < null > , "iconFilename": < null > , "imageDataId": 0, "id": 1, "orderIndex": 0, "altName": < null > ],
    ["realms": ({
        authorizationType = Internal;
        contentPageId = "<null>";
        description = Test Desc;
        externalRegistrationUrl = "<null>";
        id = 2;
        identifier = TestFB;
        showDuringSignup = 0;
    }), "identifier": 0012321, "name": TestAccount, "imageData": < null > , "iconFilename": a385bdff - 323 d - 4 a4b - 8019 - 233115 b43b38.png, "imageDataId": 1000019, "id": 2, "orderIndex": 0, "altName": < null > ]]

从上述回复中，我只需要显示“ showDuringSignup ”为1的那些记录。

一个选项是我可以在数组上运行循环并获得所需的结果，但这是一种旧方法，并且我想使用高阶函数（例如Filter，Map，flapMap等）

因此我尝试使用以下代码

let arrayOfAvailableBanks = arrayOfDictOfBankAccounts.map{$0["realms"].map{($0["showDuringSignup"] as? Int) == 1}}

但我无法获得所需的输入。

请提出我在这里做错了什么以及如何仅获取'showDuringSignup'为1的那些对象。

Answer 1

您应该改用filter，请在下面找到代码，

let arrayOfAvailableBanks = realms.filter { (dict) -> Bool in
    return dict.contains(where: { (arg) -> Bool in
        if arg.key == "realms", let value = arg.value as? [String: Any] {
            if let internalValue = value["showDuringSignup"] as? Int, internalValue == 1 {
                return true
            }
            return false
        }
        return false
    })
}

所以整个代码就是这样

let realms = [["realms": [
    "authorizationType": "External",
    "contentPageId": nil,
    "description": "Demo accounts",
    "externalRegistrationUrl": "<null>",
    "id": 1,
    "identifier": "Demo",
    "showDuringSignup": 1],
                      "identifier": "MENIISRE", "name": "MegaTest", "imageData": nil , "iconFilename": nil , "imageDataId": 0, "id": 1, "orderIndex": 0, "altName": nil ],
                     ["realms": [
                        "authorizationType": "Internal",
                        "contentPageId": nil,
                        "description": "Test Desc",
                        "externalRegistrationUrl": nil,
                        "id": 2,
                        "identifier": "TestFB",
                        "showDuringSignup": 0],
                      "identifier": 0012321, "name": "TestAccount", "imageData": nil , "iconFilename": "a385bdff - 323 d - 4 a4b - 8019 - 233115 b43b38.png", "imageDataId": 1000019, "id": 2, "orderIndex": 0, "altName": nil ]]

let arrayOfAvailableBanks = realms.filter { (dict) -> Bool in
    return dict.contains(where: { (arg) -> Bool in
        if arg.key == "realms", let value = arg.value as? [String: Any] {
            if let internalValue = value["showDuringSignup"] as? Int, internalValue == 1 {
                return true
            }
            return false
        }
        return false
    })
}

print(arrayOfAvailableBanks)

Answer 2

好吧，我想我可能已经解码了您提供的回复。

您这里需要的是filter。

您可以尝试以下方法：

let array = // Your response here
let filtered = array.filter {
    if let realms = $0["realms"] as? [String : Any], 
    let showDuringSignUp = realms["showDuringSignup"] as? Int { // Change Int if necessary
        return showDuringSignUp == 1 // Change compared value as necessary
    }
    return false
}

在Swift中从数组的字典中过滤项目

2 个答案: