Sezioni alfabetiche nella vista tabella tabella in swift

Question

Ho un elenco di nomi in ordine alfabetico, e ora voglio visualizzare questi nomi in una vista tabella. Sto lottando con il raggruppamento di questi nomi per ogni lettera.

Il mio codice è simile al seguente:

let sections:Array<AnyObject> = ["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"] 
var usernames = [String]() 

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

    let cellID = "cell" 

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

    cell.textLabel?.text = usernames[indexPath.row] 

return cell 
} 

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{ 

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

    return 26 
} 


func sectionIndexTitlesForTableView(tableView: UITableView) -> [AnyObject]!{ 

    return self.sections 
} 

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

     return index 
} 

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

     return self.sections[section] as? String 
} 

e tutto funziona abbastanza bene, tranne per il raggruppamento che rende la mia vista tabella finire così:

Quindi io ti conosco dovrebbe essere in grado di utilizzare la funzione filtrata in una matrice, ma non ho capito come implementarla.

Qualsiasi suggerimento su come procedere sarebbe apprezzato.

Answer 1

Puoi mettere i tuoi array con i nomi nel dizionario con i tasti delle lettere.

Per esempio

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

allora avete bisogno di accedere ai valori nel vostro dizionario nel modo seguente

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 
} 

Answer 2

Questo è quanto ho recentemente implementato elenco ordinato in un tableView a Swift a livello di codice,

import UIKit 

class BreedController: UITableViewController{ 

    var breeds = ["A": ["Affenpoo", "Affenpug", "Affenshire", "Affenwich", "Afghan Collie", "Afghan Hound"], "B": ["Bagle Hound", "Boxer"]] 

    struct Objects { 
     var sectionName : String! 
     var sectionObjects : [String]! 
    } 

    var objectArray = [Objects]() 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     tableView.delegate = self 
     tableView.dataSource = self 
     tableView.registerClass(UITableViewCell.classForCoder(), forCellReuseIdentifier: "Cell") 
     // SORTING [SINCE A DICTIONARY IS AN UNSORTED LIST] 
     var sortedBreeds = sorted(breeds) { $0.0 < $1.0 } 
     for (key, value) in sortedBreeds { 
      println("\(key) -> \(value)") 
      objectArray.append(Objects(sectionName: key, sectionObjects: value)) 
     } 
    } 

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

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
     return objectArray[section].sectionObjects.count 
    } 

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { 
     let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell 
     // SETTING UP YOUR CELL 
     cell.textLabel?.text = objectArray[indexPath.section].sectionObjects[indexPath.row] 
     return cell 
    } 

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


} 

Answer 3

Scarica il file CountryList Json e inserisci il tuo progetto

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 
}