Alphabetische Abschnitte in Tabelle anzeigen von swift

Können Sie Ihre arrays mit den Namen in das Wörterbuch mit dem Buchstaben-Tasten.

Beispielsweise

var names = ["a": ["and", "array"], "b": ["bit", "boring"]]; // dictionary with arrays setted for letter keys

dann benötigen Sie den Zugriff auf die Werte in Ihrem Lexikon in der folgenden Weise

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
    return names[usernames[section]].count; //maybe here is needed to convert result of names[...] to NSArray before you can access count property
}

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

    let cellID = "cell"

    let cell: UITableViewCell = self.tv.dequeueReusableCellWithIdentifier(cellID) as UITableViewCell

    cell.textLabel?.text = names[usernames[indexPath.section]][indexPath.row]; //here you access elements in arrray which is stored in names dictionary for usernames[indexPath.section] key

return cell
}

InformationsquelleAutor Sergey Pekar

Download CountryList Json-Datei und setzen Sie in der Seite, Ihr Projekt

https://gist.github.com/keeguon/2310008

   var json = NSArray()
   var arr_name = NSArray()
   var arrIndexSection : NSArray = ["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"]


override func viewDidLoad() {

   let path = Bundle.main.path(forResource: "countries", ofType: "json")
    let data = NSData(contentsOfFile: path! )
    json = (try! JSONSerialization.jsonObject(with: data as! Data, options: JSONSerialization.ReadingOptions.mutableContainers)) as! NSArray
    arr_name = json.value(forKey: "name") as! NSArray;

    tableview.reloadData()
    super.viewDidLoad()
}
//Side List in tableview
public func numberOfSections(in tableView: UITableView) -> Int {
    return 26
}
public func sectionIndexTitles(for tableView: UITableView) -> [String]? {
    return self.arrIndexSection as? [String] //Side Section title
}
public func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int
{
    return index
}


public func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    return arrIndexSection.object(at: section) as? String
}


//number of rows in table view
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
    let predicate = NSPredicate(format: "SELF beginswith[c] %@", arrIndexSection.object(at: section) as! CVarArg)
    let arrContacts = (arr_name as NSArray).filtered(using: predicate)
    return arrContacts.count;

}

public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
    let cell : TableViewCell=self.tableview.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! TableViewCell
    let predicate = NSPredicate(format: "SELF beginswith[c] %@", arrIndexSection.object(at: indexPath.section) as! CVarArg)
    let arrContacts = (arr_name as NSArray).filtered(using: predicate) as NSArray
    cell.textLabel?.text = arrContacts.object(at: indexPath.row) as? String
    return cell
}

InformationsquelleAutor Gami Nilesh

Im Fall, wenn Ihre Daten-array ist nicht vordefiniert, hier ist ein Weg, das gleiche zu erreichen.

Lassen Sie uns sagen, dass unsere Klasse ViewController.

class ViewController: UIViewController {

     var contactDictionary = [String: [TTContact]]() //TTContact is a model, it has firstName and lastName properties
     var keys = [String]()
     var alphabets = (97...122).map { "\(Character(UnicodeScalar.init($0)))" }.map { $0.uppercased() } //Populating alphabets
     ... //other properties


    override func viewDidLoad() {
        super.viewDidLoad()
        //set delegate and register cell for your tableView
        self.setContacts()
    }

    private func self.setContacts() {
         //Loop through your array, take the firstName, and the first character of that string.
         //Check the uppercase value of that character, if it's an alphabet or not, otherwise, we'd place "#" for the names starting with a number in the header.

         var temp = [String: [TTContact]]() //A temporary array
         for contact in self.contacts {
             if let firstName = contact.firstName, !firstName.isEmpty { //In my case, the firstName is an optional string
                let firstChar = "\(firstName.first!)".uppercased()
                if alphabets.contains(firstChar) {
                    var array = temp[firstChar] ?? []
                    array.append(contact)
                    temp[firstChar] = array
                } else {
                    var array = temp["#"] ?? []
                    array.append(contact)
                    temp["#"] = array
                }
            }
        }
        self.keys = Array(temp.keys).sorted() //Populating and sorting all the keys alphabetically.
        for key in self.keys { self.contactDictionary[key] = temp[key] }
        //reload table
    }
}

extension: ViewController: UITableViewDelegate, UITableViewDataSource {

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

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.contactDictionary[keys[section]]?.count ?? 0
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let key = self.keys[indexPath.section]
        let cell: //dequeue your cell here.
        if let row = self.contactDictionary[key]?[indexPath.row] {
            cell.display(with: row) //Bind your cell's outlets with the properties
            return cell
        }

        return UITableViewCell()
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        let key = self.keys[indexPath.section]
        if let row = self.contactDictionary[key]?[indexPath.row] {
            //handle selection.
        }
    }

    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? { //You can use viewForHeaderInSection either.
        return self.keys[section]
    }

}

InformationsquelleAutor Gaurav Chandarana