swift+moya URLCahe

一、定義獲取緩存策略的接口

import Foundation
protocol CachePolicyGettable {
　　var cachePolicy: URLRequest.CachePolicy {get}
}

二、TargetType 實現該接口

extension MoyaAPI: TargetType, CachePolicyGettable {
    var cachePolicy: URLRequest.CachePolicy {
        switch self {
        case .featured,.pizza,.categories:
            return .reloadIgnoringLocalCacheData
        }
    }

    ...
}

三、實現PluginType

extension MoyaAPI: TargetType, CachePolicyGettable {
    var cachePolicy: URLRequest.CachePolicy {
        switch self {
        case .featured,.pizza,.categories:
            return .reloadIgnoringLocalCacheData
        }
    }

四、應用PluginType

let MoyaAPIPrivider = MoyaProvider<MoyaAPI>(plugins: [CachePolicyPlugin()])

func all() -> Observable<[FeaturedViewModel]> {
        
        let networkData = MoyaAPIPrivider.rx.request(.featured)
            .filterSuccessfulStatusCodes()
            .debug()
            .mapArray(Featured.self)
            .map{ item -> [FeaturedViewModel] in
                var viewModels: [FeaturedViewModel] = []
                for model in item {
                    try! model.createOrUpdate()
                    
                    let viewModel = FeaturedViewModel(model: model)
                    viewModels.append(viewModel)
                }
                return viewModels
            }.asObservable()
}