我在解析Json文件时遇到问题。尝试解析一个Json文件：
{
"id": 1234,
"lists": {
"pause": {
"attached": [
{
"from": 1576680044000,
"to": 1576680055000,
"length": 11000
}
]
}
},
"time": {
"start_time": 1576680044000,
"end_time": 1576680055000
}
}
这是我为它定义的两个结构。
暂停结构：
public struct Pause: Decodable {
public let attached: [AttachedModel]
init(badlAttached: [AttachedModel] = []) {
self.attached = attached
}
private enum CodingKeys: String, CodingKey {
case attached = "attached"
}
}
AttachedModel模型结构：
public struct AttachedModel: Decodable {
private enum CodingKeys: CodingKey {
case from, to
}
public let range: Range<Int64>
init(range: Range<Int64>) {
self.range = range
}
public init(from decoder: Decoder) throws {
do {
let rootContainer = try decoder.container(keyedBy: CodingKeys.self)
let from: Int64 = try rootContainer.decode(key: .from)
let to: Int64 = try rootContainer.decode(key: .to)
range = from ..< to
} catch {
throw JSONDecoder.DecodingError(type: type(of: self), payload: error)
}
}
}
然后，我为其创建一个键和一个函数：
enum Key: String {
case lists
case pause = "pause"
}
func pause() throws -> Pause? {
let seriesJSON = try lists()
if let json = seriesJSON[Key.pause.rawValue] as? [String: Any] {
return try JSONDecoder().decode(Pause.self, from: json) //It's never called
} else {
return nil
}
}
在功能上lists()：
func lists() throws -> [String: Any] {
let json: [String: Any] = try payload.valueForRequiredKey(Key. lists.rawValue)
return json
}
这是输出 list()
[1] = {
key = "pause"
value = {
payload_data_0 = 0x0000600001af8a10 {
ObjectiveC.NSObject = {
baseNSObject@0 = {
isa = __NSSingleObjectArrayI
}
}
}
payload_data_1 = 0x544e786f6a497768
payload_data_2 = 0x444f3363544e3363
instance_type = 0x00007fe02f877ed0
}
}
问题是，即使pause有数据，该行也始终为假if let json = seriesJSON[Key.pause.rawValue] as? [String: Any] {，并且转到“nil有人可以告诉我这里的问题在哪里吗？
为您的json创建模型类：
import Foundation
class MyItem: Codable {
let id: Int
let lists: Lists
let time: Time
}
class Lists: Codable {
let pause: Pause
}
class Pause: Codable {
let attached: [Attached]
}
class Attached: Codable {
let from, to, length: Int
}
class Time: Codable {
let start_time, end_time: Int
}
// MARK: - Helper functions for creating encoders and decoders
fileprivate func newJSONDecoder() -> JSONDecoder {
let decoder = JSONDecoder()
if #available(iOS 10.0, OSX 10.12, tvOS 10.0, watchOS 3.0, *) {
decoder.dateDecodingStrategy = .iso8601
}
return decoder
}
fileprivate func newJSONEncoder() -> JSONEncoder {
let encoder = JSONEncoder()
if #available(iOS 10.0, OSX 10.12, tvOS 10.0, watchOS 3.0, *) {
encoder.dateEncodingStrategy = .iso8601
}
return encoder
}
然后，您可以像这样解析它：
let myItem = try? newJSONDecoder().decode(MyItem.self, from: jsonData)
// Read from (for example)
let from = myItem.lists.pause.attached[0].from
本文收集自互联网，转载请注明来源。
如有侵权，请联系 [email protected] 删除。
我来说两句