在Swift中过滤Array of Dictinonary of Array中的项目

我收到的服务回复如下

[["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 > ]]

从上面的回复中,我只能显示' showDuringSignup '为1的记录 .

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

因此,我尝试使用下面的代码

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

但我无法得到所需的输入 .

请在这里建议我做错了什么,以及如何只获取'showDuringSignup'为1的那些对象 .

回答(2)

2 years ago

好吧,我想我可能已经解码了你提供的回复 .

你需要的是 filter .

你可以试试这个:

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
}

2 years ago

你应该使用 filter ,请找到下面的代码,

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的

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)