UITableView with Multiple Sections using Realm and Swift

Solution 1:

Here's some sample code that does exactly what you're looking for:

import UIKit
import RealmSwift

class Dog: Object {
    dynamic var name = ""
    dynamic var race = ""
    dynamic var age = 0
    dynamic var owner = ""
    dynamic var dogID = ""

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

    convenience init(name: String, race: String, dogID: String) {
        self.init()
        self.name = name
        self.race = race
        self.dogID = dogID
    }
}

class TableViewController: UITableViewController {
    let items = try! Realm().objects(Dog.self).sorted(["race", "name"])
    var sectionNames: [String] {
        return Set(items.valueForKeyPath("race") as! [String]).sort()
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")

        let realm = try! Realm()
        if realm.isEmpty {
            try! realm.write {
                realm.add(Dog(name: "Bailey", race: "Golden Retrievers", dogID: "0"))
                realm.add(Dog(name: "Bella", race: "German Shepherds", dogID: "1"))
                realm.add(Dog(name: "Max", race: "Bulldogs", dogID: "2"))
                realm.add(Dog(name: "Lucy", race: "Yorkshire Terriers", dogID: "3"))
                realm.add(Dog(name: "Charlie", race: "Bulldogs", dogID: "4"))
                realm.add(Dog(name: "Molly", race: "German Shepherds", dogID: "5"))
                realm.add(Dog(name: "Buddy", race: "German Shepherds", dogID: "6"))
                realm.add(Dog(name: "Daisy", race: "Siberian Huskies", dogID: "7"))
            }
        }
    }

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return sectionNames.count
    }

    override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        return sectionNames[section]
    }

    override func tableView(tableView: UITableView?, numberOfRowsInSection section: Int) -> Int {
        return items.filter("race == %@", sectionNames[section]).count
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)
        cell.textLabel?.text = items.filter("race == %@", sectionNames[indexPath.section])[indexPath.row].name
        return cell
    }
}

Which looks like this: