為什么我在 macOS Mojave 10.14.5 上的 XCode 10.2.1 的 SKAdNetworkInfo 中收到“預期返回字符串的函數中的錯誤返回”？

Question

我只是在編譯appodeal庫，我沒有寫那個代碼，為什么會拋出錯誤？ 我可以以某種方式糾正它們嗎？ XCode 截圖： https ://imgur.com/a/isrPe07

//
//  SKAdNetworkInfo.swift
//  CriteoPublisherSdk
//
//  Copyright © 2018-2020 Criteo. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

import Foundation

struct SKAdNetworkInfo {
  let adNetworkIds: [String]
  let hasCriteoId: Bool

  init(bundle: Bundle = Bundle.main) {
    adNetworkIds = SKAdNetworkInfo.getAdNetworkIds(from: bundle)
    hasCriteoId = adNetworkIds.contains(CRSKAdNetworkInfo.CriteoId)
  }
}

extension SKAdNetworkInfo {
  struct Keys {
    static let items = "SKAdNetworkItems"
    static let identifier = "SKAdNetworkIdentifier"
  }

  static func getAdNetworkIds(from bundle: Bundle) -> [String] {
    (bundle.object(forInfoDictionaryKey: Keys.items) as? [[String: String]])?
      .compactMap { item in item[Keys.identifier] } ?? []
  }
}

let skanInfo = SKAdNetworkInfo()

@objc extension CRSKAdNetworkInfo {
  public static let CriteoId = "hs6bdukanm.skadnetwork"

  public class func hasCriteoId() -> Bool {
   skanInfo.hasCriteoId
  }

  public class func skAdNetworkIds() -> [String] {
    skanInfo.adNetworkIds
  }
}

錯誤：

/Users/developer/Documents/Sur​​Build1/SurBuild2/Pods/CriteoPublisherSdk/CriteoPublisherSdk/Sources/SKAdNetwork/SKAdNetworkInfo.swift:41:3：預期返回“[String]”的函數中缺少返回/Users/developer/Documents/Sur​​Build1 /SurBuild2/Pods/CriteoPublisherSdk/CriteoPublisherSdk/Sources/SKAdNetwork/SKAdNetworkInfo.swift:51:3：在預期返回“布爾”用戶/開發者/文檔/SurBuild1/SurBuild2/Pods/CriteoPublisherSdk/CriteoPublisherSdk/Sources/的函數中缺少返回SKAdNetwork/SKAdNetworkInfo.swift:55:3：預期返回“[String]”的函數中缺少返回

外部庫中的代碼怎么會有這樣的編譯錯誤？ 語言標准是否改變或發生了什么？ 我可以簡單地添加一個“return”指令來使其工作嗎？

Answer 1

@objc extension CRSKAdNetworkInfo {
  public static let CriteoId = "hs6bdukanm.skadnetwork"

  public class func hasCriteoId() -> Bool {
   return skanInfo.hasCriteoId
  }

  public class func skAdNetworkIds() -> [String] {
    return skanInfo.adNetworkIds
  }
}