翻遍百度沒事找到合適的參考文章，最終找到了這篇以圖片加載講解隊(duì)列的文章https://juejin.im/post/5b6047dae51d4517580e1627

問題：項(xiàng)目進(jìn)入首頁(yè)需要進(jìn)行多個(gè)多次的網(wǎng)絡(luò)請(qǐng)求，如果有一個(gè)請(qǐng)求失敗或者網(wǎng)絡(luò)問題仍然會(huì)請(qǐng)求其他接口。（非AFN，原生網(wǎng)絡(luò)請(qǐng)求方式）

思路：讓網(wǎng)絡(luò)請(qǐng)求以隊(duì)列的方式進(jìn)行，先進(jìn)先出，一個(gè)失敗取消剩余請(qǐng)求。

實(shí)現(xiàn)：

1、保存請(qǐng)求的類

//請(qǐng)求狀態(tài)枚舉
enum RequestState {
    case new,start,failed,success
}

//請(qǐng)求記錄
class LZUrlRecord {
    let name: String
    let url:String
    var state = RequestState.new
    var dicParamter:Dictionary<String,Any>?
    var strParamter:String?
    
    var completion:((RequestState,Dictionary<String,Any>)->())?
    
    init(name:String,url:String){
        self.name = name
        self.url = url
    }
}

2、隊(duì)列，及隊(duì)列中Operation實(shí)現(xiàn)

//保存隊(duì)列操作的單例
let sharePendingOperations = PendingOperations()

class PendingOperations{
    //請(qǐng)求隊(duì)列
    lazy var requestQueue:OperationQueue = {
        var queue = OperationQueue()
        queue.name = "Request queue"
        queue.maxConcurrentOperationCount = 1
        return queue
    }()
    //隊(duì)列掛起
    func suspendAllOperations()  {
        self.requestQueue.isSuspended = true
    }
    // 隊(duì)列重啟
    func resumeAllOperations() {
        self.requestQueue.isSuspended = false
    }
    // 重置隊(duì)列
    func resetAllOperations() {
        self.requestQueue.cancelAllOperations()
        self.resumeAllOperations()
    }
    
}
//Operation是一個(gè)抽象類，專為子類化而設(shè)計(jì)。每個(gè)子類代表一個(gè)特定的任務(wù)，如前面的圖所示。

//自定義請(qǐng)求任務(wù)
class LZRequestTask: Operation {

    let urlRecord:LZUrlRecord
    
    init(_ urlRecord:LZUrlRecord){
        self.urlRecord = urlRecord
    }
    
    override func main() {
        //每次啟動(dòng)一個(gè)operation時(shí)將整個(gè)隊(duì)列掛起，暫停所有operations
        sharePendingOperations.suspendAllOperations()
        //發(fā)起網(wǎng)絡(luò)請(qǐng)求
        RNetUtil.shareManager.requestTPOST(url: urlRecord.url, paramter: urlRecord.strParamter!) { (state, data) in
       //有回調(diào)將網(wǎng)絡(luò)狀態(tài)及請(qǐng)求結(jié)果返回
            if let handler = self.urlRecord.completion{
                self.urlRecord.state = state
                handler(state, data)
            }
        }
    }
}

3、網(wǎng)絡(luò)請(qǐng)求

//網(wǎng)絡(luò)請(qǐng)求
 func requestPOSTWithQueue(url:String,
                              paramter:String,
                              completion:@escaping ((RequestState,Dictionary<String,Any>)->Void)) {
      //定義請(qǐng)求記錄實(shí)例
        let urlRecord = LZUrlRecord.init(name: url, url: url)
        urlRecord.strParamter = paramter
      // 實(shí)現(xiàn)回調(diào)
        urlRecord.completion = {
            (state,data) in
            if state == .success{
                // 成功時(shí)重新啟動(dòng)操作隊(duì)列
                sharePendingOperations.resumeAllOperations()
            }else{
                //  失敗時(shí)重置操作隊(duì)列
                sharePendingOperations.resetAllOperations()
            }
             //將網(wǎng)絡(luò)狀態(tài)和返回值傳回主線程刷新ui
            completion(state,data)
        }
        // 網(wǎng)絡(luò)請(qǐng)求任務(wù)實(shí)例
        let requestTask = LZRequestTask.init(urlRecord)
        //將網(wǎng)絡(luò)請(qǐng)求任務(wù)加入操作隊(duì)列
         sharePendingOperations.requestQueue.addOperation(requestTask)

    }

4、viewController里發(fā)起網(wǎng)絡(luò)請(qǐng)求

//同時(shí)發(fā)起多個(gè)網(wǎng)絡(luò)請(qǐng)求
func testRequestTasks() {
      RNetUtil.shareManager.requestPOSTWithQueue(url: url, paramter: "0") { (state, data) in
          print(state,data)
      }
      RNetUtil.shareManager.requestPOSTWithQueue(url: url, paramter: "0") { (state, data) in
          print(state,data)
      }
      RNetUtil.shareManager.requestPOSTWithQueue(url: url, paramter: "0") { (state, data) in
          print(state,data)
      }
  }

5、請(qǐng)求結(jié)果
失敗時(shí)

失敗時(shí).gif

成功時(shí)

成功時(shí).gif

基本解決了文章開頭提出的問題。

有什么改進(jìn)意見或者好的想法，歡迎大家提出。