我想为我的UICollectionView实现IgListKit,这个库要求我使用 "类模型:ListDiffable"。这个库要求我使用 "类模型:ListDiffable"
根据我目前的架构,我有 "Struct Model : Decodable"(结构模型:可解码),因为我在我的NetworkService中使用JSON Decoder来检索数据,我有2个结构,1个用于根,2个用于我的Array。
struct Talents : Decodable {
let status : String?
let error : String?
let response : String?
}
struct Talent: Decodable {
let id: String
let name : String
let smallDesc: String
let largeDesc : String
}
\\I also have enum CodingKeys to match the keys for both structs
以下是我的结构 结构输出 在我的UICollectionView中使用效果良好。
当我把这些结构改为类
class Talents : Decodable {
var status : String?
var error : String?
var response : String?
init( status : String,error : String, response : String){
self.status = status
self.error = error
self.response = response
}
}
这就是 班级输出 我得到,我不知道如何使用。
为了解决这个问题,我应该做哪些改变,并将.ListDiffable协议存根应用到我的Model类中?ListDiffable协议存根到我的Model类?
服务文件的实例,在我的CollectionVC的viewDidLoad中,我把数据放在一个数组中。
static func getCategoryTalents(category:String,completion: @escaping (Bool, [Talent]?, Error?) -> Void) {
let parameters: Parameters = [
"filter": category,
"shuffle": 1
]
AF.request(Constants.baseUrl,
parameters : parameters ).response { response in
guard let data = response.data else {
DispatchQueue.main.async {
print("\(Error.self)")
completion(false, nil, Error.self as? Error)
}
return}
do {
let talentsResponse = try JSONDecoder().decode(Talents.self, from: data)
print(talentsResponse)
let firstJSONString = talentsResponse.response?.replacingOccurrences(of: "\\", with: "")
let secondJSONString = firstJSONString?.replacingOccurrences(of: "\"{", with: "{").replacingOccurrences(of: "}\"", with: "}")
guard let talentArray = try! JSONDecoder().decode([Talent]?.self, from: (secondJSONString?.data(using: .utf8)!)!) else {
return }
print(talentArray)
var talents = [Talent]()
for talent in talentArray {
guard let individualTalent = talent as Talent? else { continue }
talents.append(individualTalent)
}
DispatchQueue.main.async {
completion(true, talents, nil)
}
} catch {
DispatchQueue.main.async {
completion(false, nil, error)
}
}
}
}
你不需要改变现有的 struct
到 class
开辟 class
并制作一个初始化器,接受 struct
作为参数。
struct TalentDataModel: Decodable {
let status : String?
let error : String?
let response : String?
}
class Talents: Decodable {
var status : String?
var error : String?
var response : String?
init(dataModel: TalentDataModel) {
status = dataModel.status
error = dataModel.error
response = dataModel.response
}
}
因为用srtucts来做服务模型是很费劲的,就像我们看到的那样。此处
我修改了我的类,使其与IGListKit一起工作。
import Foundation
import IGListKit
class Talents: NSObject,Decodable {
let status : String
let error : String
let response : String
init(status:String,error:String,response:String) {
self.status = status
self.error = error
self.response = response
}
}
extension NSObject: ListDiffable {
public func diffIdentifier() -> NSObjectProtocol {
return self
}
public func isEqual(toDiffableObject object: ListDiffable?) -> Bool {
return isEqual(object)
}
}