ios - RealmSwift 数据过滤

Question

假设我有很多城市对象。所以，城市 ID 将是我的主键，因为它们不能重复。将会有相同的城市名称，但是，不同的 ID 和不同的 ShopAddress。这是我的 json 结果这是来 self 的后端

{
     "CityName" : "NewYork",
     "ID" : 65,
     "CityCode" : "NY",
     "ShopAddress" : "NO.7\/8 17th quarter, 27th Street, LiverPool Township, NewYork."

},
{
    "CityName" : "NewYork",
    "ID" : 89,
    "CityCode" : "NY",
    "ShopAddress" : "NO.7\/8 17th quarter, 40th Street, West Stadium, NewYork."
},
{
    "CityName" : "Maimi",
    "ID" : 150,
    "CityCode" : "MI",
    "ShopAddress" : "NO.7\/8 17th quarter, 40th Street, West Stadium, Maimi."
}...etc

这是我的 Realm 对象

import Foundation
import RealmSwift

class StoreList: Object {

dynamic var storeID : String = ""
dynamic var cityCode : String = ""
dynamic var cityName : String = ""
dynamic var shopAddress :String = ""

override static func primaryKey() -> String? {
    return "storeID"
}

}

如何获取CityNames的数据以及与每个CityNames相关的相应店铺地址？

for (var i = 0; i <= cityname.count; i++) {
        cityItems.append("City Names from realm")
        actualPositions.append(-1)

        var items = [String]()
        for (var i = 0; i < cityName["Newyork"].shopaddress.count; i++) {
            items.append("the locations shop address of each item from each cities")
        }

        self.locationItems.append(items)
    }

我想这样做，因为我想在我的 Accordion TableView 中显示这样的内容。

我写的上面的代码只是一个例子。会有很多错误。但是，我确实需要过滤方面的帮助。有什么帮助吗？

Answer 1

好的，这是我的解决方案:

首先，循环遍历对象并获取所有城市并将它们全部放入数组中。您还可以查找重复的城市，以便每个城市都有一个部分:

var cities = [string]()
var items = [int]()

// loop through your realm objects
for (var i = 0; i <= RealmObjects.count; i++) {

   // add every city to your array if it isn't already in your array
   if !cities.contains(RealmObjects.CityName) {
      cities.append(RealmObjects.CityName)
      items.append(1)
   }
   else {
      // get index of city
      let indexOfCity = cities.indexOf(RealmObjects.CityName)
      // get number of shops for the city
      var numberOfShops = cities[indexOfCity]
      numberOfShops += 1
      // raise items for section by 1
      items[indexOfCity] = numberOfShops
   }

}

// in your tableViewController add these sections as the title of your header
override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {

// this is your array including the cities
return self.cities

}

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// return the number of sections
return self.section.count

}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// return the number of rows for one section
return self.items[section] // not sure with this you have to get the current section 

}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("tableCell", forIndexPath: indexPath)

    // Add the shops in your section
    cell.textLabel?.text = self.RealmObjects.ShopAddress[indexPath.row]

    return cell

}

我没有尝试这段代码...这是基本方法。快速解释:

1. 您必须将城市放入数组中(不能重复城市)
2. 统计一个城市的商店数量
3. 设置适合数组内城市的部分
4. 设置一个部分的行数，为此您应该读出计算一个城市的商店数量的数组
5. 设置部分数量
6. 至少调用 cellForRowAtIndexPath 才能设置单元格的文本