我有一个存储在 Realm 数据库中的联系人列表，现在我想在 TableView 中显示联系人的姓名。作为一个列表，这很好用，可以按名称的升序排序。我正在努力为索引列表中的每个字母对这些名称进行分组。我的代码用相同的信息填充每个部分。

我的代码是这样的:

    var contacts: Results<ContactItem>!
var contactIndexTitles = [String]()

@IBOutlet weak var tblContacts: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()
    self.setupUI()
    let contactIndex = "A B C D E F G H I J K L M N O P Q R S T U V W X Y Z"
    contactIndexTitles = contactIndex.componentsSeparatedByString(" ")
    self.reloadTheTable()
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    reloadTheTable()
}


func setupUI() {
    tblContacts.delegate = self
    tblContacts.dataSource = self
}

func reloadTheTable() {
    do {
        let realm = try Realm()
        contacts = realm.objects(ContactItem).sorted("Name", ascending: true)
        tblContacts.reloadData()
        print("reload tbl \(contacts)")

    } catch {

    }
}

//willDisplayCell forRowAtIndexPath
func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
    cell.backgroundColor = UIColor.clearColor()
}

//numberOfSectionsInTableView
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return contactIndexTitles.count
}

//sectionForSectionIndexTitle
func tableView(tableView: UITableView, sectionForSectionIndexTitle title: String, atIndex index: Int) -> Int{

    return index
}

//titleForHeaderInSection
func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String?{

    return self.contactIndexTitles[section] as String
}

//numberOfRowsInSection
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
    return contacts.count
}

//sectionIndexTitlesForTableView
func sectionIndexTitlesForTableView(tableView: UITableView) -> [String]? {
    return contactIndexTitles as [String]
}

//cellForRowAtIndexPath
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    let identifer: String = "myCell"
    var cell = tblContacts.dequeueReusableCellWithIdentifier(identifer)

    if cell == nil {
        cell = UITableViewCell(style: .Subtitle, reuseIdentifier: identifer)
    }

    let contactinfo = contacts[indexPath.row]
    cell?.textLabel?.text = contactinfo.Name
    cell?.detailTextLabel?.text = contactinfo.KeyNumber
    return cell!
}

关于如何过滤 Realm 数据库并正确填充部分的任何建议？

编辑

所以我使用第一个链接和给定的示例修改了代码，它显示正常。

TableViewController代码:

var contacts: Results<ContactItem>!

var contactIndexTitles = 字符串

类 TableViewController: UITableViewController {

@IBOutlet weak var tblcontacts: UITableView!


override func viewDidLoad() {
    super.viewDidLoad()
    self.setupUI()
    self.reloadTheTable()
    let contactIndex = "A B C D E F G H I J K L M N O P Q R S T U V W X Y Z"
    contactIndexTitles = contactIndex.componentsSeparatedByString(" ")

    //print(Realm.Configuration.defaultConfiguration.fileURL!)
}

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    reloadTheTable()
}

func setupUI() {

    tblcontacts.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")
}

func reloadTheTable() {
    do {
        let realm = try Realm()
        contacts = realm.objects(ContactItem.self).sorted("Name")
        tblcontacts.reloadData()
    }
    catch
    {

    }
}

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

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

override func sectionIndexTitlesForTableView(tableView: UITableView) -> [String]? {
    return contactIndexTitles
}

override func tableView(tableView: UITableView?, numberOfRowsInSection section: Int) -> Int {
    return contacts.filter("Name BEGINSWITH %@", contactIndexTitles[section]).count
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell = tblcontacts.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)
    cell.textLabel?.text = contacts.filter("Name BEGINSWITH %@", contactIndexTitles[indexPath.section])[indexPath.row].Name
    return cell

}

override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{
    let contact : ContactItem = contacts[indexPath.row]  //, contactIndexTitles[indexPath.section])
    print(contact)
    performSegueWithIdentifier("addContact", sender: contact)
    print("Selected row at \(indexPath.row)")
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)
{
if(segue.identifier == "addContact")
    {
        let viewController = segue.destinationViewController as! AddEntryViewController
        viewController.contact = sender as! ContactItem

    }
}

现在我还有一个问题，那就是下一个 Controller 的问题。我似乎无法获得正确的代码以转到正确部分中的正确行。 如何从正确的部分选择正确的行？

最佳答案

这是来自 https://stackoverflow.com/a/38797693/373262 的示例为您的模型并指定一个硬编码的部分标题数组作为您在上面的评论所要求的:

import UIKit
import RealmSwift

class ContactItem: Object {
    dynamic var name = ""
    dynamic var keyNumber = ""

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

let alphabet = (UnicodeScalar("A").value...UnicodeScalar("Z").value).flatMap(UnicodeScalar.init)

class ViewController: UITableViewController {
    let items = try! Realm().objects(ContactItem.self).sorted(byProperty: "name")

    override func viewDidLoad() {
        super.viewDidLoad()

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

        let realm = try! Realm()
        if realm.isEmpty {
            try! realm.write {
                realm.add(ContactItem(name: "Bailey", keyNumber: "0"))
                realm.add(ContactItem(name: "Bella", keyNumber: "1"))
                realm.add(ContactItem(name: "Max", keyNumber:"2"))
                realm.add(ContactItem(name: "Lucy", keyNumber: "3"))
                realm.add(ContactItem(name: "Charlie", keyNumber:"4"))
                realm.add(ContactItem(name: "Molly", keyNumber: "5"))
                realm.add(ContactItem(name: "Buddy", keyNumber: "6"))
                realm.add(ContactItem(name: "Daisy", keyNumber: "7"))
            }
        }
    }

    func items(forSection section: Int) -> Results<ContactItem> {
        return items.filter("name BEGINSWITH %@", alphabet[section].description)
    }

    override func numberOfSections(in tableView: UITableView) -> Int {
        return alphabet.count
    }

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

    override func tableView(_ tableView: UITableView?, numberOfRowsInSection section: Int) -> Int {
        return items(forSection: section).count
    }

    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
        let contactinfo = items(forSection: indexPath.section)[indexPath.row]
        cell.textLabel?.text = contactinfo.name
        cell.detailTextLabel?.text = contactinfo.keyNumber
        return cell
    }
}

这是最终结果:

以及指向 Xcode 项目的链接:https://static.realm.io/debug/RealmContacts.tgz

关于ios - 在 swift 中使用 Realm 创建索引 TableView ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40028634/