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将调度组与循环中的调用一起使用有什么好处?我使用alamo fire作为我的网络层。场景是我想以块的形式从服务器获取数据,一旦所有调用完成,我就可以继续前进。我真的需要使用调度组或简单的循环调用会起作用吗?

for _ in 1...calls {
            callFetchTransaction(offset: self.offset, limit: self.transactionsLimit, calls: calls)
        }

这就是我的函数内部的内容:

var listOfIdsToSort = [String:Date]()
func callFetchTransaction(offset:Int,limit:Int,calls:Int) {
    TransactionsModel.reportTransactions(offset: offset, limit: limit, success: { (transactions) in
        ACTIVITYCALL += 1
        print("CurrentOffset \(offset), with limit\(limit)")
        print("ACTIVITY CALL \(ACTIVITYCALL)")
        for transaction in transactions {
            self.listOfIdsToSort[transaction.id!] = transaction.createdAt!
        }
        if ACTIVITYCALL == calls {
           TransactionsModel.assignSequenceNumbers(dictOfIds: self.listOfIdsToSort) {
                self.didCompleteProgressAndSync(duration: 2.0)
                print("sync time after --- \(Date().timeIntervalSince1970)")
            }
            return
        } else if ACTIVITYCALL < calls {
            self.currentSyncingProgress += self.perActivityPercentage
            DispatchQueue.main.async {
                self.updateProgressBar(value: self.currentSyncingProgress)
            }
        }
    }) { (response, statusCode) in
        self.callFetchTransaction(offset: offset, limit: limit, calls: calls)
    }
 

它似乎工作正常,但我想知道调度组是否有一些好处或这种方法存在缺陷。

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