Question

你好，我成功地用json数据填充了tableview及其工作，但是现在我想更新Referh按钮上的tableview单击刷新按钮，我再次调用现有的func，我创建它来调用api，让我向你展示我的代码

代码

func OverdueList(){
    let preferences = UserDefaults.standard
    let uid = "u_id"
    let acTkn = "acc_tkn"

    let u_ID = preferences.object(forKey: uid)
    let A_Token = preferences.object(forKey: acTkn)

    let params = ["user_id": u_ID!, "access_token": A_Token!]
    print(params)
    SVProgressHUD.show()
    Alamofire.request(inspectionsList, method: .post, parameters: params).responseJSON(completionHandler: {(response) in
        switch response.result{
        case.success(let value):
            let json  = JSON(value)
            print(json)
            let data = json["inspections_overdue_data"]
            print(data)
            if data == []{
                self.viewNodata.isHidden = false
            }else{
                data.array?.forEach({ (iunOverDue) in
                    let iOveList = OvedueModel(surveyor_id: iunOverDue["surveyor_id"].stringValue, country: iunOverDue["country"].stringValue, time: iunOverDue["time"].stringValue, address2: iunOverDue["address2"].stringValue, address3: iunOverDue["address3"].stringValue, notes: iunOverDue["notes"].stringValue, house_num: iunOverDue["house_num"].stringValue, name: iunOverDue["name"].stringValue, address1: iunOverDue["address1"].stringValue, latitude: iunOverDue["latitude"].stringValue, eircode: iunOverDue["eircode"].stringValue, date_inspected: iunOverDue["date_inspected"].stringValue, property_id: iunOverDue["property_id"].stringValue, county: iunOverDue["county"].stringValue, client_id: iunOverDue["client_id"].stringValue, longitude: iunOverDue["longitude"].stringValue)
                    self.searchResult = self.overDueData
                    self.overDueData.append(iOveList)
                })

                self.tblOvedue.reloadData()
            }
            SVProgressHUD.dismiss()
        case.failure(let error):
            print(error.localizedDescription)
        }

    })
}

我正在调用此func来填充表格视图，并且我的操作如下所示

@IBAction func btnRefreshTapped(_ sender: UIButton) {
      OverdueList()
    }

问题在于，一次又一次地重复调用此函数数据后，我该如何解决这个问题

请帮助我解决这个问题

Answer 1

请尝试以下代码：

func OverdueList(){


    let preferences = UserDefaults.standard
    let uid = "u_id"
    let acTkn = "acc_tkn"

    let u_ID = preferences.object(forKey: uid)
    let A_Token = preferences.object(forKey: acTkn)

    let params = ["user_id": u_ID!, "access_token": A_Token!]
    print(params)
    SVProgressHUD.show()
    Alamofire.request(inspectionsList, method: .post, parameters: params).responseJSON(completionHandler: {(response) in
        switch response.result{
        case.success(let value):
            self.overDueData.removeAll()
            let json  = JSON(value)
            print(json)
            let data = json["inspections_overdue_data"]
            print(data)
            if data == []{
                self.viewNodata.isHidden = false
            }else{
                data.array?.forEach({ (iunOverDue) in
                    let iOveList = OvedueModel(surveyor_id: iunOverDue["surveyor_id"].stringValue, country: iunOverDue["country"].stringValue, time: iunOverDue["time"].stringValue, address2: iunOverDue["address2"].stringValue, address3: iunOverDue["address3"].stringValue, notes: iunOverDue["notes"].stringValue, house_num: iunOverDue["house_num"].stringValue, name: iunOverDue["name"].stringValue, address1: iunOverDue["address1"].stringValue, latitude: iunOverDue["latitude"].stringValue, eircode: iunOverDue["eircode"].stringValue, date_inspected: iunOverDue["date_inspected"].stringValue, property_id: iunOverDue["property_id"].stringValue, county: iunOverDue["county"].stringValue, client_id: iunOverDue["client_id"].stringValue, longitude: iunOverDue["longitude"].stringValue)
                    self.searchResult = self.overDueData
                    self.overDueData.append(iOveList)
                })

                self.tblOvedue.reloadData()
            }
            SVProgressHUD.dismiss()
        case.failure(let error):
            print(error.localizedDescription)
        }

    })
}

它可以帮助您谢谢您。

Answer 2

在这里清除

case.success(let value):
let json  = JSON(value)
print(json)
let data = json["inspections_overdue_data"]
print(data)
if data == []{
    self.viewNodata.isHidden = false
}else{
    self.overDueData.removeAll()
    data.array?.forEach({ (iunOverDue) in
        let iOveList = OvedueModel(surveyor_id: iunOverDue["surveyor_id"].stringValue, country: iunOverDue["country"].stringValue, time: iunOverDue["time"].stringValue, address2: iunOverDue["address2"].stringValue, address3: iunOverDue["address3"].stringValue, notes: iunOverDue["notes"].stringValue, house_num: iunOverDue["house_num"].stringValue, name: iunOverDue["name"].stringValue, address1: iunOverDue["address1"].stringValue, latitude: iunOverDue["latitude"].stringValue, eircode: iunOverDue["eircode"].stringValue, date_inspected: iunOverDue["date_inspected"].stringValue, property_id: iunOverDue["property_id"].stringValue, county: iunOverDue["county"].stringValue, client_id: iunOverDue["client_id"].stringValue, longitude: iunOverDue["longitude"].stringValue)
        self.searchResult = self.overDueData
        self.overDueData.append(iOveList)
    })

    self.tblOvedue.reloadData()
}

您还可以将数组声明为Set以删除相似的对象

Answer 3

这很简单...只是因为在刷新时您正在调用“ OverdueList”，但无法从overDueData数组中清除数据。这就是重复获取数据的原因。

为此，您只需要简单地完成此操作即可。

@IBAction func btnRefreshTapped(_ sender: UIButton) {    
     self.overDueData.removeAll()
     self.OverdueList()    
}

重新整理tableview视图，如刷新

3 个答案: