Make a little progress every day
在本章中主要学习到了，分层架构的设计，其实就是分文件夹来创建View，Controller，Model的类文件
• 表示层，相当于TP中的View
用户与系统交互的组件集合。用户通过这一层向系统提交请求或发出指令,系统通过这一层接收用户 请求或指令,待指令消化吸收后再调用下一层,接着将调用结果展现到这一层。表示层应该是轻薄的,不应该具 有业务逻辑。
• 业务逻辑层，相当于TP中的Controller
系统的核心业务处理层。负责接收表示层的指令和数据,待指令和数据消化吸收后,再进行组织 业务逻辑的处理,并将结果返回给表示层。
• 数据持久层，相当于TP中的Model
数据持久层用于访问信息系统层,即访问数据库或文件操作的代码应该只能放到数据持久层中, 而不能出现在其它层中。
• 信息系统层，相当于开发WEB时用到数据库
系统的数据来源,可以是数据库、文件、遗留系统或者网络数据。
以下为分层架构设计实现的一个Note备忘录的DemoCode
数据持久层，PersistenceLayer/Note.swift 、NoteDAO.swift
业务领域对像类，可以理解为PHP框架开中的 数据库中的表
import Foundation
//业务领域对像类，可以理解为PHP框架开中的 数据库中的表
class Note {
let Date: NSDate
var Content: NSString
init(date:NSDate,content:NSString) {
self.Date = date
self.Content = content
}
}DAO类，一般按表名命名，相当于PHP框架加的 Model
import Foundation
//DAO类，一般按表名命名，相当于PHP框架加的 Model
class NoteDAO {
//保存数据列var，没用数据，数据保存到内存中
var listData: NSMutableArray! //可变数组类型
//只进行和数据库的交互，不需要保持任何状态，所以可以使用单例模式
private static let sharedInstance = NoteDAO() //单例的实例保存这个属性中
class var sharedFoo: NoteDAO { //swift中的静态计算属性
//添加一些测试数据
let dateFormatter : DateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
let date1: NSDate = dateFormatter.date(from: "2015-01-01 16:01:03")! as NSDate
let note1: Note = Note(date:date1, content: "Welcome to MyNote.")
let date2: NSDate = dateFormatter.date(from: "2015-01-02 8:01:03")! as NSDate
let note2: Note = Note(date:date2, content: "欢迎使用MyNote。")
//这里需要先实例化，才能添加值
sharedInstance.listData = NSMutableArray()
sharedInstance.listData.add(note1) //listData字典里面放的Note对像
sharedInstance.listData.add(note2)
return sharedInstance
}
//插入Note方法
func create(model: Note) -> Int {
self.listData.add(model)
return 0
}
//删除Note方法
func remove(model: Note) -> Int {
for note in self.listData {
let note2 = note as! Note
//比较日期主键是否相等
if note2.Date == model.Date {
self.listData.remove(note2)
break
}
}
return 0
}
//修改Note.Content方法
func modify(model: Note) -> Int {
for note in self.listData {
let note2 = note as! Note
//比较日期主键是否相等
if note2.Date == model.Date {
note2.Content = model.Content
break
}
}
return 0
}
//查询所有数据方法
func findAll() -> NSMutableArray {
return self.listData
}
//修改Note方法
func findById(model: Note) -> Note? {//返回类型为可选的，说明Note可以返回nil
for note in self.listData {
let note2 = note as! Note
//比较日期主键是否相等
if note2.Date == model.Date {
return note2
}
}
return nil
}
}业务逻辑层，BusinessLogicLayer/NoteBL.swift
业务逻辑层类，相当于PHP框架中的 Controller
import Foundation
//业务逻辑层类，相当于PHP框架中的 Controller
class NoteBL {
//插入Note方法
func createNote(model: Note) -> NSMutableArray {
let dao:NoteDAO = NoteDAO.sharedFoo
dao.create(model: model) //会有警告，因为create方法有返回值但在这里并没有使用
return dao.findAll()
}
//删除Note方法
func remove(model: Note) -> NSMutableArray {
let dao:NoteDAO = NoteDAO.sharedFoo
dao.remove(model: model)
return dao.findAll()
}
//查询所用数据方法
func findAll() -> NSMutableArray {
let dao:NoteDAO = NoteDAO.sharedFoo
return dao.findAll()
}
}表示层，presentationLayer/MasterViewController.swift 、DetailViewController.swift、AddViewController.swift
MasterViewController.swift
import UIKit
//Table列表页面
class MasterViewController: UITableViewController {
let BL:NoteBL = NoteBL()
var detailViewController: DetailViewController? = nil
var objects = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.navigationItem.leftBarButtonItem = self.editButtonItem
//let addButton = UIBarButtonItem(barButtonSystemItem: .add, target: self, action: #selector(insertNewObject(_:)))
//self.navigationItem.rightBarButtonItem = addButton
if let split = self.splitViewController {
let controllers = split.viewControllers
self.detailViewController = (controllers[controllers.count-1] as! UINavigationController).topViewController as? DetailViewController
}
//查出所有数据
self.objects = self.BL.findAll()
//（接收通知）监听通知事件RegisterCompletionNotification，交给registerCompletion函数处理
NotificationCenter.default.addObserver(self, selector: #selector(CreateNoteList(notification:)), name: NSNotification.Name.init(rawValue: "CreateNoteList"), object: nil)// . object: nil 可以发送通知的视图接收过来
}
override func viewWillAppear(_ animated: Bool) {
self.clearsSelectionOnViewWillAppear = self.splitViewController!.isCollapsed
super.viewWillAppear(animated)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/func insertNewObject(_ sender: Any) {
objects.insert(NSDate(), at: 0)
let indexPath = IndexPath(row: 0, section: 0)
self.tableView.insertRows(at: [indexPath], with: .automatic)
}*/
// MARK: - Segues
//详细页面显示
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showDetail" {
if let indexPath = self.tableView.indexPathForSelectedRow {
let object = objects[indexPath.row] as! Note
let controller = (segue.destination as! UINavigationController).topViewController as! DetailViewController
controller.detailItem = object
controller.navigationItem.leftBarButtonItem = self.splitViewController?.displayModeButtonItem
controller.navigationItem.leftItemsSupplementBackButton = true
}
}
}
// MARK: - Table View
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.objects.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
let object = objects[indexPath.row] as! Note//查询数组中的Note出来
cell.textLabel!.text = object.Content as String//取Note的Content的属性
return cell
}
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
//进行操作，当前主要处理delete操作
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
let removeNote = self.objects[indexPath.row] as? Note
self.objects = BL.remove(model: removeNote!)
//self.objects.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .fade)
} else if editingStyle == .insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
//实现通知监听方法
func CreateNoteList(notification : NSNotification) {
let allData = notification.object as! NSMutableArray//取到投送过来对像
self.objects = allData//拿到的数据给当前视图的变量
self.tableView.reloadData()//重新加载当前表视图
}
}DetailViewController.swift
import UIKit
//详细页面显示
class DetailViewController: UIViewController {
@IBOutlet weak var detailDescriptionLabel: UILabel!
func configureView() {
// Update the user interface for the detail item.
if let detail = self.detailItem {
if let label = self.detailDescriptionLabel {
label.text = detail.Content as String
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.configureView()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
var detailItem: Note? {
didSet {
// Update the view.
self.configureView()
}
}
}AddViewController.swift
import UIKit
//添加备忘录
class AddViewController: UIViewController {
let BL:NoteBL = NoteBL()
@IBOutlet weak var noteTextField: UITextField! //TextField的输出口
//Cancel的动作事件
@IBAction func onCancel(_ sender: UIBarButtonItem) {
self.dismiss(animated: true, completion: nil)//关闭模态
}
@IBAction func onSave(_ sender: UIBarButtonItem) {
//实例化一个新的Note
let note = Note(date: NSDate(), content: self.noteTextField.text! as NSString)//NSDate(),为当前日期
//调用业务逻辑层的createNote方法，会返回添加后的所有数据
let objs = BL.createNote(model: note)
//注册通知，传输数据 . object: objs 把返回的所有数据投送出去
NotificationCenter.default.post(name: NSNotification.Name(rawValue: "CreateNoteList"), object: objs, userInfo: nil)
self.dismiss(animated: true, completion: nil)//关闭模态
self.noteTextField.resignFirstResponder()//username放弃第一响应者
}
override func viewDidLoad() {
super.viewDidLoad()
//注册点击事件
self.view.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(handleTap)))
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//点击空白处关闭键盘方法
func handleTap(sender: UITapGestureRecognizer) {
if sender.state == .ended {
self.noteTextField.resignFirstResponder()//username放弃第一响应者
}
sender.cancelsTouchesInView = false
}
}