效果图

QQ20160907-0@2x.png

有个bug： 索引与title跳动没有符合实际，现在没有解决思路，后续解决

代码注释比较清楚,一个文件完成功能

//
//  ViewController.swift
//  TableViewIndex
//
//  Created by mba on 16/9/7.
//  Copyright © 2016年 mbalib. All rights reserved.
//

import UIKit

class ViewController: UITableViewController {

    var userArray: [Userr] = [Userr]()
    var sectionsArray: [[Userr]] = [[Userr]]()
    
    
    var indexArray: [String] = [String]()
    
    // uitableView 索引搜索工具类
    var collation: UILocalizedIndexedCollation? = nil
    
    override func viewDidLoad() {
        
        super.viewDidLoad()
        tableView.backgroundColor = UIColor.yellow
        tableView.delegate = self
        tableView.dataSource = self
        self.configureSection()
    }
  
    func configureSection() {
        for i in 0...3 {
            userArray.append(Userr(name: "合理\(i)"))
            userArray.append(Userr(name: "a合理\(i)"))
            userArray.append(Userr(name: "你合理\(i)"))
            userArray.append(Userr(name: "咯合理\(i)"))
            userArray.append(Userr(name: "g合理\(i)"))
        }
        userArray.append(Userr(name: "咯理"))
        
        
        
        //获得当前UILocalizedIndexedCollation对象并且引用赋给collation,A-Z的数据
        collation = UILocalizedIndexedCollation.current()
        //获得索引数和section标题数
        let sectionTitlesCount = collation!.sectionTitles.count

        //临时数据，存放section对应的userObjs数组数据
        var newSectionsArray = [[Userr]]()

        //设置sections数组初始化：元素包含userObjs数据的空数据
        for _ in 0..<sectionTitlesCount {
            let array = [Userr]()
            newSectionsArray.append(array)
        }
        
        //将用户数据进行分类，存储到对应的sesion数组中
        
        for bean in userArray {
            //根据timezone的localename，获得对应的的section number
            let sectionNumber = collation?.section(for: bean, collationStringSelector: #selector( getter: Userr.name))
            //获得section的数组
            var sectionBeans = newSectionsArray[sectionNumber!]
            
            //添加内容到section中
            sectionBeans.append(bean)
            
            // swift 数组是值类型，要重新赋值
            newSectionsArray[sectionNumber!] = sectionBeans
        }
        
        
         //排序，对每个已经分类的数组中的数据进行排序，如果仅仅只是分类的话可以不用这步
        for i in 0..<sectionTitlesCount {
            let beansArrayForSection = newSectionsArray[i]
             //获得排序结果
            let sortedBeansArrayForSection = collation?.sortedArray(from: beansArrayForSection, collationStringSelector:  #selector(getter: Userr.name))
            //替换原来数组
            newSectionsArray[i] = sortedBeansArrayForSection as! [Userr]
            
        }

        sectionsArray = newSectionsArray
    }
}

// MARK: - tableviewDelegate
extension ViewController{
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return (collation?.sectionTitles.count)!
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let beanInSection = sectionsArray[section]
        return beanInSection.count
    }
    
    //设置每行的cell的内容
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let id = "id"
        var cell = tableView.dequeueReusableCell(withIdentifier: id)
        if cell == nil {
            cell = UITableViewCell(style: .default, reuseIdentifier: id)
        }
        let userNameInSection = sectionsArray[indexPath.section]
         let bean = userNameInSection[indexPath.row]
        cell?.textLabel?.text = (bean as AnyObject).name
        return cell!
    }
    
    /*
     * 跟section有关的设定
     */
    //设置section的Header
    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        let beansInSection = sectionsArray[section]
        if (beansInSection as AnyObject).count <= 0 {
            return nil
        }
        if let headserString = collation?.sectionTitles[section] {
            if !indexArray.contains(headserString) {
                indexArray.append(headserString)
            }
            return headserString
        }
        return nil
    }
    
    //设置索引标题
    override func sectionIndexTitles(for tableView: UITableView) -> [String]? {
//        return collation?.sectionTitles
        return indexArray
    }
    
    //关联搜索
    override func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int {
          return (collation?.section(forSectionIndexTitle: index))!
      }
  }


 class Userr: NSObject{
   var name: String?
    init(name: String){
        self.name = name
    }
}