将结构阵列转换为JSON Swift

Question

我有一个我需要写入服务器端代码的struct数组>

struct Photo {
    var imageName = "", thumbFileURL = "", viewCount = 0, likeCount = 0
}

然后我有几个照片对象，如...

var photo1 = Photo()
photo1.imageName = "ImPhoto1"
photo1.thumbFileURL = "www.SO.com"
photo1.viewCount = 5
photo1.likeCount = 1
var photo2 = Photo()
photo1.imageName = "ImPhoto2"
photo1.thumbFileURL = "www.SO.com"
photo1.viewCount = 10
photo1.likeCount = 2
////// and then same for x amount of Photo() object

然后我有一个数组

myArray = [photo1,photo2,photo3, ...]

，然后我需要写一个看上去有些东西的JSON：

myJson object = {
    photo1: {
        imageName: "ImPhoto1"
        thumbFileURL = "www.SO.com"
        viewCount: 5
        likeCount: 1
    },
    photo2: {
        imageName: "Imphoto2"
        ....
    },
    ....
}

所以我的问题是，如何转换myarray-> myJson

Answer 1

您需要PhotoCollection的Encodable的自定义实现，这是一系列照片的包装类型：

struct Photo : Codable {
    var imageName = "", thumbFileURL = "", viewCount = 0, likeCount = 0
}
struct PhotoCollection: Encodable, ExpressibleByArrayLiteral {
    var photos: [Photo]
    typealias ArrayLiteralElement = Photo
    init(arrayLiteral elements: Photo...) {
        photos = elements
    }
    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        for (i, photo) in photos.enumerated() {
            try container.encode(photo, forKey: CodingKeys(stringValue: "photo(i + 1)")!)
        }
    }
    struct CodingKeys: CodingKey, ExpressibleByStringLiteral {
        var stringValue: String { return key }
        init?(stringValue: String) {
            key = stringValue
        }
        var intValue: Int? { return Int(key) }
        init?(intValue: Int) {
            key = "(intValue)"
        }
        init(stringLiteral value: String) {
            key = value
        }
        var key: String
    }
}
var photo1 = Photo()
photo1.imageName = "ImPhoto1"
photo1.thumbFileURL = "www.SO.com"
photo1.viewCount = 5
photo1.likeCount = 1
var photo2 = Photo()
photo1.imageName = "ImPhoto2"
photo1.thumbFileURL = "www.SO.com"
photo1.viewCount = 10
photo1.likeCount = 2
let photoCollection: PhotoCollection = [photo1, photo2]
let json = try JSONEncoder().encode(photoCollection)
print(String(data: json, encoding: .utf8)!)

此打印：

{"photo2":{"imageName":"","likeCount":0,"viewCount":0,"thumbFileURL":""},"photo1":{"imageName":"ImPhoto2","likeCount":2,"viewCount":10,"thumbFileURL":"www.SO.com"}}

格式：

{
  "photo2": {
    "imageName": "",
    "likeCount": 0,
    "viewCount": 0,
    "thumbFileURL": ""
  },
  "photo1": {
    "imageName": "ImPhoto2",
    "likeCount": 2,
    "viewCount": 10,
    "thumbFileURL": "www.SO.com"
  }
}

Answer 2

struct Photo:Codable {
    var imageName = "", thumbFileURL = "", viewCount = 0, likeCount = 0
}
var photo1 = Photo()
photo1.imageName = "ImPhoto1"
photo1.thumbFileURL = "www.SO.com"
photo1.viewCount = 5
photo1.likeCount = 1
var photo2 = Photo()
photo1.imageName = "ImPhoto2"
photo1.thumbFileURL = "www.SO.com"
photo1.viewCount = 10
photo1.likeCount = 2
var myArray = [photo1,photo2]
let tempData = try? JSONEncoder().encode(myArray)
//Create JSON
var Finaldata: Any?
if let data = tempData { Finaldata = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) } 

这将起作用