如何在swift 4中解析Json dictionary

Question

嗨，我对这个Json有问题：

{
"id": "libMovies",
"jsonrpc": "2.0",
"result": {
"limits": {
"end": 75,
"start": 0,
"total": 1228
},
"movies": [{
"art": {
"fanart": "myfanart",
"poster": "myposter"
},
"file": "myfile",
"label": "mylable",
"movieid": mymovieid,
"playcount": 0,
"rating": myrating,
"thumbnail": "mythumbnail"
}]
}
}

当我用这个代码在swift 5中解析Json时

try! JSONDecoder().decode([MyMovie].self, from: data!)

我收到这个错误

致命错误："try！"表达式意外引发错误：Swift.DecodingError.typeMismatch(Swift.Array，Swift.DecoodingError.Context(codingPath:[]，debugDescription:"应解码Array，但找到字典。"，underlyingError:nil((：

如何解决此问题？

Answer 1

对于下面的JSON，

{"id":"libMovies","jsonrpc":"2.0","result":{"limits":{"end":75,"start":0,"total":1228},"movies":[{"art":{"fanart":"myfanart","poster":"myposter"},"file":"myfile","label":"mylable","movieid":"mymovieid","playcount":0,"rating":"myrating","thumbnail":"mythumbnail"}]}}

需要使用的Codable型号，

struct Root: Decodable {
let id, jsonrpc: String
let result: Result
}
struct Result: Decodable {
let limits: Limits
let movies: [Movie]
}
struct Limits: Decodable {
let end, start, total: Int
}
struct Movie: Decodable {
let art: Art
let file, label, movieid: String
let playcount: Int
let rating, thumbnail: String
}
struct Art: Decodable {
let fanart, poster: String
}

像这样解析JSONdata，

do {
let response = try JSONDecoder().decode(Root.self, from: data)
print(response.result.movies.map({"file: ($0.file), label: ($0.label)"}))
} catch {
print(error)
}

编辑：

要单独保存电影，请创建一个[电影]类型的变量，

var movies = [Movie]()

现在，在解析时，将response.result.movies保存在上面创建的属性中

do {
let response = try JSONDecoder().decode(Root.self, from: data)
print(response.result.movies.map({"file: ($0.file), label: ($0.label)"}))
movies = response.result.movies
} catch {
print(error)
}