Question

我希望成为展示对象的一部分，该对象是国家countryID的一部分，与对象一致。在不同的城市，有对象我想表明Idi的城市等于‍‍countryID。

for key in self.cityId{
            if key == self.countryID{
                self.countCity++
            }
        }

但是当我运行return console
时

和模拟器

代码：

写numberOfRowsInSection

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        for key in self.cityId{
            if key == self.countryID{
                self.countCity++
            }
        }

        return countCity
    }

和cellForRowAtIndexPath

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("cityCell", forIndexPath: indexPath)
        let city = cityArray[indexPath.row]
        if city.cityId == countryID{
        if let NameCity:String = city.nameCity {


            cell.textLabel?.text = NameCity
            print(NameCity)
            }
        }

        // Configure the cell...

        return cell
    }

解析API

func GetPassCity(){

        NSURLSession.sharedSession().dataTaskWithURL(urlCity){[unowned self] ( data ,response ,error) in
            if error != nil{
                print("A")
                print(error!)
            }else{


                do{
                //readin data from Server
                    let posts = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! [[String:AnyObject]]
                    //save data
                    for post in posts{
                        var postCity:City?
                        if let idCity = post["userId"] as? Int , let nameCity = post["title"] as? String{
                            postCity = City(idCity: idCity, nameCity: nameCity)

                            self.cityId.append(idCity)

                        }

                        self.cityArray.append(postCity!)

                        dispatch_async(dispatch_get_main_queue()){

                            print(self.countCity)
                            self.tableView.reloadData()
                        }


                    }
                }catch let error as NSError{

                    print("B")
                    print(error)
                }
            }


        }.resume()

        print(cityArray)
    }

你认为这是问题吗？

Answer 1

您需要self.countCity += 1，self.countCity!++或++self.countCity!。执行self.countCity = +1只是将countCity设置为1.打开一个游乐场并试一试。

所以：

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    for key in self.cityId{
        if key == self.countryID{
            self.countCity!++
        }
    }

    return countCity
}

Answer 2

我发现解决方案使用过滤器（）

代码：写numberOfRowsInSection

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows

    return citySelected.count
}

和cellForRowAtIndexPath

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("cityCell", forIndexPath: indexPath)
    let city = citySelected[indexPath.row]

    if let NameCity:String = city.nameCity {


        cell.textLabel?.text = NameCity
        print(NameCity)

    }

    // Configure the cell...

    return cell
}

解析API

func GetPassCity（）{

    NSURLSession.sharedSession().dataTaskWithURL(urlCity){[unowned self] ( data ,response ,error) in
        if error != nil{
            print("A")
            print(error!)
        }else{


            do{
            //readin data from Server
                let posts = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! [[String:AnyObject]]
                //save data
                for post in posts{
                    var postCity:City?
                    if let idCity = post["userId"] as? Int , let nameCity = post["title"] as? String{
                        postCity = City(idCity: idCity, nameCity: nameCity)

                        self.cityId.append(idCity)

                    }

                    self.cityArray.append(postCity!)



let filter = self.cityArray.filter({ $0.cityId == self.countryID})
                    self.citySelected = filter


                    dispatch_async(dispatch_get_main_queue()){

                        print(self.countCity)
                        self.tableView.reloadData()
                    }


                }
            }catch let error as NSError{

                print("B")
                print(error)
            }
        }

并返回真实数据:)

过滤tableview中的数据

2 个答案: