我是编码的新手,并且一直试图按字母顺序按照部分对我的tableview行中的数据(名称)进行排序.我已经设法创建了部分和索引,但无法弄清楚如何获取名称进行排序; 每个部分都有相同的AZ名称列表.
我有一个具有对象的Names模型类:nameTitle,nameDetail,image,纬度坐标和经度坐标.tableView显示nameTitle.text.其他对象在另一个视图控制器中显示或访问.
这是我的TableViewController的示例代码:
import UIKit
class TableOfContentsVC: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBAction func backButtonPressed(_ sender: Any) {
dismiss(animated: false, completion: nil)
}
@IBOutlet weak var tableView: UITableView?
var name = [Name]()
override func viewDidLoad() {
super.viewDidLoad()
let cell001 = Name (nameTitle: "Acker" , nameDetail: "Details for Acker are listed here.", picture: UIImage (named: "somePicture.jpg"), latCoordinates: 38, longCoordinates: 119)
name.append (cell001)
let cell002 = Name (nameTitle: "Baker" , nameDetail: "Details for Baker are listed here.", picture: UIImage (named: "somePicture.jpg"), latCoordinates: 38, longCoordinates: 119)
name.append (cell002)
let cell003 = Name (nameTitle: "Caker" , nameDetail: "Details for Caker are listed here.", picture: UIImage (named: "somePicture.jpg"), latCoordinates: 38, longCoordinates: 119)
name.append (cell003)
let cell004 = Name (nameTitle: "Dacker" , nameDetail: "Details for Dacker are listed here.", picture: UIImage (named: "somePicture.jpg"), latCoordinates: 38, longCoordinates: 119)
name.append (cell004)
let cell005 = Name (nameTitle: "Ecker" , nameDetail: "Details for Ecker are listed here.", picture: UIImage (named: "somePicture.jpg"), latCoordinates: 38, longCoordinates: 119)
name.append (cell005)
let cell006 = Name (nameTitle: "Facker" , nameDetail: "Details for Facker are listed here.", picture: UIImage (named: "somePicture.jpg"), latCoordinates: 38, longCoordinates: 119)
name.append (cell006)
}
func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int {
let currentCollation = UILocalizedIndexedCollation.current() as UILocalizedIndexedCollation
return currentCollation.section(forSectionIndexTitle: index)
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
let currentCollation = UILocalizedIndexedCollation.current() as UILocalizedIndexedCollation
let sectionTitles = currentCollation.sectionTitles as NSArray
return sectionTitles.object(at: section) as? String
}
func sectionIndexTitles(for tableView: UITableView) -> [String]? {
let currentCollation = UILocalizedIndexedCollation.current() as UILocalizedIndexedCollation
return (currentCollation.sectionIndexTitles as NSArray) as? [String]
}
func numberOfSections(in tableView: UITableView) -> Int {
let currentCollation = UILocalizedIndexedCollation.current() as UILocalizedIndexedCollation
let sectionTitles = currentCollation.sectionTitles as NSArray
return sectionTitles.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCell(withIdentifier: "NameCell", for: indexPath) as? NameCell {
let name = Name [indexPath.row]
cell.updateUI(name: name)
return cell
} else {
return UITableViewCell()
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return name.count
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let name = names [indexPath.row]
performSegue(withIdentifier: "ContentVC", sender: name)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destination = segue.destination as? ContentVC {
if let name = sender as? Name {
destination.name = name
}
}
}
}
除了让名字按字母顺序显示在相应部分之外,一切都很有效.我已经尝试了大约10种不同的方法来实现这一点,没有任何帮助.任何建议将不胜感激.提前致谢!
你这样做是错误的.您没有使用数据来生成索引.
让我们考虑一下你的数据 var name: [Name]
定义每个Name属于的部分:
extension Name {
var titleFirstLetter: String {
return String(self.nameTitle[self.nameTitle.startIndex]).uppercased()
}
}
从您的数据生成索引
// all the first letters in your data
let firstLetters = names.map { $0.titleFirstLetter }
// some letters appear multiple times, let's remove duplicates
let uniqueFirstLetters = Array(Set(firstLetters))
// sort them
// this is your index
let sortedFirstLetters = uniqueFirstLetters.sorted()
生成部分
let sections: [[Name]] = sortedFirstLetters.map { firstLetter in
return names
.filter { $0.titleFirstLetter == firstLetter } // only names with the same first letter in title
.sorted { $0.nameTitle < $1.nameTitle } // sort them
}
使用它们
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return sortedFirstLetters[section]
}
func sectionIndexTitles(for tableView: UITableView) -> [String]? {
return sortedFirstLetters
}
func numberOfSections(in tableView: UITableView) -> Int {
return sections.count // or sortedFirstLetters.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sections[section].count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let name = sections[indexPath.section][indexPath.row]
...
}
编辑 - 完整示例:
class Name {
let nameTitle: String
let nameDetail: String
init(nameTitle: String, nameDetail: String) {
self.nameTitle = nameTitle
self.nameDetail = nameDetail
}
var titleFirstLetter: String {
return String(self.nameTitle[self.nameTitle.startIndex]).uppercased()
}
}
class ViewController : UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet weak var tableView: UITableView?
var names: [Name] = []
var sortedFirstLetters: [String] = []
var sections: [[Name]] = [[]]
override func viewDidLoad() {
super.viewDidLoad()
let cell001 = Name(nameTitle: "Acker", nameDetail: "Details for Acker are listed here.")
names.append (cell001)
let cell002 = Name(nameTitle: "Baker", nameDetail: "Details for Baker are listed here.")
names.append (cell002)
let cell003 = Name(nameTitle: "Caker" , nameDetail: "Details for Caker are listed here.")
names.append (cell003)
let cell004 = Name(nameTitle: "Dacker", nameDetail: "Details for Dacker are listed here.")
names.append (cell004)
let cell005 = Name(nameTitle: "Ecker", nameDetail: "Details for Ecker are listed here.")
names.append (cell005)
let cell006 = Name(nameTitle: "Facker", nameDetail: "Details for Facker are listed here.")
names.append (cell006)
let firstLetters = names.map { $0.titleFirstLetter }
let uniqueFirstLetters = Array(Set(firstLetters))
sortedFirstLetters = uniqueFirstLetters.sorted()
sections = sortedFirstLetters.map { firstLetter in
return names
.filter { $0.titleFirstLetter == firstLetter }
.sorted { $0.nameTitle < $1.nameTitle }
}
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return sortedFirstLetters[section]
}
func sectionIndexTitles(for tableView: UITableView) -> [String]? {
return sortedFirstLetters
}
func numberOfSections(in tableView: UITableView) -> Int {
return sections.count
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sections[section].count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let name = sections[indexPath.section][indexPath.row]
let cell = UITableViewCell(style: .subtitle, reuseIdentifier: nil)
cell.textLabel?.text = name.nameTitle
cell.detailTextLabel?.text = name.nameDetail
return cell
}
}
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