完成异步任务的火力地堡与斯威夫特 [英] Finish asynchronous task in Firebase with Swift

问题描述

的我想写这将返回我的所有工人数组的功能，但它是从火力检索数据之前返回的

这是我的code：

  FUNC getWorkersList（） -  GT; （[工人]）
{
    让workersInfoRef = ref.childByAppendingPath(\"countries/\\(userCountry)/cities/\\(userCity)/workers/\\(workFieldToRecieve)/\")    变种workerList = [工人]（）
        workersInfoRef.queryOrderedByChild（name）的observeSingleEventOfType（.value的，withBlock：{（快照）在        打印（snapshot.childrenCount）
        休息的snapshot.children.allObjects作为！ [FDataSnapshot] {            让workerInfo =工人（UID：rest.value [UID作为字符串名称：！rest.value [名称]为String，城市：！rest.value [城市】作为字符串，职业：休息.value的[专业]为String，电话：rest.value [电话]为String，电子邮件：rest.value [电子邮件]为String，国家：rest.value [国家作为！字符串）
            workerList.append（workerInfo）        }
        }）{（误差）
            打印（error.description）
    }    打印（workerList.count）
    返回workerList}
 

解决方案

这不是测试...我只是codeD起来就飞给你的总体思路

添加完成块/回调到你的函数...

  FUNC getWorkersList（回调：（（数据：[工人]） -  GT;无效））{
    让workersInfoRef = ref.childByAppendingPath(\"countries/\\(userCountry)/cities/\\(userCity)/workers/\\(workFieldToRecieve)/\")    变种workerList = [工人]（）
    workersInfoRef.queryOrderedByChild（名称）
       .observeSingleEventOfType（.value的，withBlock：{（快照）在        打印（snapshot.childrenCount）
        休息的snapshot.children.allObjects作为！ [FDataSnapshot] {            让workerInfo =工人（UID：rest.value [UID作为字符串名称：！rest.value [名称]为String，城市：！rest.value [城市】作为字符串，职业：休息.value的[专业]为String，电话：rest.value [电话]为String，电子邮件：rest.value [电子邮件]为String，国家：rest.value [国家作为！字符串）
            workerList.append（workerInfo）        }
        打印（workerList.count）
        回调（workerList）   }）{（印刷错误）（error.description）}
}
 

在传递完成块..

  getWorkersList（回调：{（数据：[工人]） -  GT;无效的
    打印（数据）
}）
 

I am trying to write a function that will return an array of all my workers, but it is returning before retrieving the data from firebase

here is my code:

func getWorkersList() -> ([Worker])
{
    let workersInfoRef = ref.childByAppendingPath("countries/\(userCountry)/cities/\(userCity)/workers/\(workFieldToRecieve)/")

    var workerList = [Worker]()
        workersInfoRef.queryOrderedByChild("name").observeSingleEventOfType(.Value, withBlock: { (snapshot) in

        print(snapshot.childrenCount)
        for rest in snapshot.children.allObjects as! [FDataSnapshot]{

            let workerInfo = Worker(uid: rest.value["uid"] as! String, name: rest.value["name"] as! String, city: rest.value["city"] as! String, profession: rest.value["profession"] as! String, phone: rest.value["phone"] as! String, email: rest.value["email"] as! String, country: rest.value["country"] as! String)
            workerList.append(workerInfo)

        }
        }) { (error) in
            print(error.description)
    }

    print(workerList.count)
    return workerList

}

解决方案

This is not tested... I just coded it up on the fly to give you the general idea

add a completion block/callback to your function...

func getWorkersList(callback: ((data:[Worker]) ->Void )) {
    let workersInfoRef = ref.childByAppendingPath("countries/\(userCountry)/cities/\(userCity)/workers/\(workFieldToRecieve)/")

    var workerList = [Worker]()
    workersInfoRef.queryOrderedByChild("name")
       .observeSingleEventOfType(.Value, withBlock: { (snapshot) in

        print(snapshot.childrenCount)
        for rest in snapshot.children.allObjects as! [FDataSnapshot]{

            let workerInfo = Worker(uid: rest.value["uid"] as! String, name: rest.value["name"] as! String, city: rest.value["city"] as! String, profession: rest.value["profession"] as! String, phone: rest.value["phone"] as! String, email: rest.value["email"] as! String, country: rest.value["country"] as! String)
            workerList.append(workerInfo)

        }
        print(workerList.count)
        callback(workerList)

   }) { (error) in  print(error.description) }
}

pass in the completion block..

getWorkersList(callback: { (data:[Worker]) -> Void in 
    print(data)
})

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