Swift 4- SwiftyJson比较数组和合并找到的值

Question

我有一个JSON对象，它包含一个名称和值的列表。我想将另一个数组[String]与它进行比较，如果在一个JSON对象值中找到该值，则将该值合并为一个新对象。

我尝试过在merge(with)循环中使用for，但是，它似乎只是合并一个值。

例如：> json_cat =>>{> name："aaa"，>姓氏："aaa-1"，>年级："aaa-2“> }，>{> name："bbb"，>姓氏："bbb-1"，>年级："bbb-2”> }，>{> name："ccc"，>姓氏："ccc-1"，>等级："ccc-2“>}> // >让arraytest:String = "aaa"，"ccc"，"ddd”> // json_cat比较数组数组>结果={>名称："aaa"，>姓氏："aaa-1"，>等级："aaa-2“> }，>{> name："ccc"，>姓氏："ccc-1"，>年级："ccc-2“>}

let json_cat: JSON = "json from url" 
let arraytest:[String] = ["aaa", "ccc", "ddd"]
var json_cat_array = JSON()

    json_cat.forEach({ (index, json_p) in
                    if arraytest.contains(json_p["name"].string!) {
                        //print("\(index) - \(json_p)")
                        try! json_cat_array.merge(with: json_p)

                    }
                })

Answer 1

您可以这样实现您的循环：

json_cat.forEach({ (index, json_p) in
    if arraytest.contains(json_p["name"].string!) {
        //print("\(index) - \(json_p)")

        json_cat_array[json_p["name"].string!] = json_p

    }
})

合并函数实际上是用于合并数据的。如本例所示：

let original: JSON = [
    "first_name": "John",
    "age": 20,
    "skills": ["Coding", "Reading"],
    "address": [
        "street": "Front St",
        "zip": "12345",
    ]
]

let update: JSON = [
    "last_name": "Doe",
    "age": 21,
    "skills": ["Writing"],
    "address": [
        "zip": "12342",
        "city": "New York City"
    ]
]

let updated = original.merge(with: update)
// [
//     "first_name": "John",
//     "last_name": "Doe",
//     "age": 21,
//     "skills": ["Coding", "Reading", "Writing"],
//     "address": [
//         "street": "Front St",
//         "zip": "12342",
//         "city": "New York City"
//     ]
// ]

Answer 2

此代码使用Swift 4基金会JSON解析器。Swift 4默认拥有神奇的解析器。

import Foundation
let jsonString = """
        [{
        "surname": "Roxxy",
        "grade": "neaou"
        },
        {
        "name": "Puffi",
        "surname": "Chips",
        "grade": "meaou"
        },
        {
        "name": "Taffy",
        "surname": "Baby",
        "grade": "mew-mew"
        }]
"""
struct JsonCat: Decodable {
    let name: String?
    let surname: String
    let grade: String
}

struct Cat {
    let name: String
    let surname: String
    let grade: String
}


guard let jsonData = jsonString.data(using: .utf8), let jsonCats = try? JSONDecoder().decode([JsonCat].self, from: jsonData) else {
    fatalError()
}

var cats: [Cat] = []
jsonCats.forEach { jsonCat in
    guard let name = jsonCat.name else {
        return
    }
    let cat = Cat(name: name, surname: jsonCat.surname, grade: jsonCat.grade)
    cats.append(cat)
}

print(cats)