最近在學(xué)習(xí)coredata, 因?yàn)轫?xiàng)目開發(fā)中需要，特意學(xué)習(xí)和整理了一下，整理出來方便以后使用和同行借鑒。目前開發(fā)使用的swift語言開發(fā)的項(xiàng)目。所以整理出來的是swift版本，oc我就放棄了。 雖然swift3 已經(jīng)有了，目前整理的這個版本是swift2 的。swift 3 的話有些新特性。 需要另外調(diào)整，后續(xù)有時間再整理。
繼承coredata有兩種方式：
創(chuàng)建項(xiàng)目時集成
這種方式是自動繼承在appdelegate里面，調(diào)用的使用需要通過uiapplication的方式來獲取appdelegate得到conext。本人不喜歡這種方式，不喜歡appdelegate太多代碼堆在一起，整理了一下這種方式
將coredata繼承的代碼單獨(dú)解耦出來做一個單例類
項(xiàng)目結(jié)構(gòu)圖
項(xiàng)目文件說明
coredata核心的文件就是
1.xpstoremanager（管理coredata的單例類）
2.coredatademo.xcdatamodeld (coredata數(shù)據(jù)模型文件)
3.student+coredataproperites.swift和student.swift (學(xué)生對象)
4.viewcontroller.swift 和main.storyboard是示例代碼
細(xì)節(jié)代碼
1. xpstoremanager.swift
coredata數(shù)據(jù)管理單例類
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//// xpstoremanager.swift// coredatademo//// created by xiaopin on 16/9/16.// copyright © 2016年 xiaopin.cnblogs.com. all rights reserved.// import coredata /// 本地數(shù)據(jù)庫管理類：默認(rèn)是寫在appdelegate的，可以這樣分離出來class xpstoremanager { //單例寫法 static let shareinstance = xpstoremanager() private init() { } // mark: - core data stack lazy var applicationdocumentsdirectory: nsurl = { // the directory the application uses to store the core data store file. this code uses a directory named "com.pinguo.coredatademo" in the application's documents application support directory. let urls = nsfilemanager.defaultmanager().urlsfordirectory(.documentdirectory, indomains: .userdomainmask) print("\(urls[urls.count-1])") return urls[urls.count-1] }() lazy var managedobjectmodel: nsmanagedobjectmodel = { // the managed object model for the application. this property is not optional. it is a fatal error for the application not to be able to find and load its model. let modelurl = nsbundle.mainbundle().urlforresource("coredatademo", withextension: "momd")! return nsmanagedobjectmodel(contentsofurl: modelurl)! }() lazy var persistentstorecoordinator: nspersistentstorecoordinator = { // the persistent store coordinator for the application. this implementation creates and returns a coordinator, having added the store for the application to it. this property is optional since there are legitimate error conditions that could cause the creation of the store to fail. // create the coordinator and store let coordinator = nspersistentstorecoordinator(managedobjectmodel: self.managedobjectmodel) let url = self.applicationdocumentsdirectory.urlbyappendingpathcomponent("singleviewcoredata.sqlite") var failurereason = "there was an error creating or loading the application's saved data." do { try coordinator.addpersistentstorewithtype(nssqlitestoretype, configuration: nil, url: url, options: nil) } catch { // report any error we got. var dict = [string: anyobject]() dict[nslocalizeddescriptionkey] = "failed to initialize the application's saved data" dict[nslocalizedfailurereasonerrorkey] = failurereason dict[nsunderlyingerrorkey] = error as nserror let wrappederror = nserror(domain: "your_error_domain", code: 9999, userinfo: dict) // replace this with code to handle the error appropriately. // abort() causes the application to generate a crash log and terminate. you should not use this function in a shipping application, although it may be useful during development. nslog("unresolved error \(wrappederror), \(wrappederror.userinfo)") abort() } return coordinator }() lazy var managedobjectcontext: nsmanagedobjectcontext = { // returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.) this property is optional since there are legitimate error conditions that could cause the creation of the context to fail. let coordinator = self.persistentstorecoordinator var managedobjectcontext = nsmanagedobjectcontext(concurrencytype: .mainqueueconcurrencytype) managedobjectcontext.persistentstorecoordinator = coordinator return managedobjectcontext }() // mark: - core data saving support func savecontext () { if managedobjectcontext.haschanges { do { try managedobjectcontext.save() } catch { // replace this implementation with code to handle the error appropriately. // abort() causes the application to generate a crash log and terminate. you should not use this function in a shipping application, although it may be useful during development. let nserror = error as nserror nslog("unresolved error \(nserror), \(nserror.userinfo)") abort() } } } } |
2.appdelegate.swift
在這個行數(shù)中加入一句代碼，退出后執(zhí)行保存一下
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func applicationwillterminate(application: uiapplication) { // called when the application is about to terminate. save data if appropriate. see also applicationdidenterbackground:. // saves changes in the application's managed object context before the application terminates. xpstoremanager.shareinstance.savecontext() } |
3.student.swift
編寫了針對這個學(xué)生對象的增刪改查
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//// student.swift// coredatademo//// created by cdmac on 16/9/12.// copyright © 2016年 xiaopin.cnblogs.com. all rights reserved.// import foundationimport coredata class student: nsmanagedobject { // insert code here to add functionality to your managed object subclass /* 一般涉及到的情況有：增刪改，單對象查詢，分頁查詢（所有，條件查詢，排序），對象是否存在，批量增加，批量修改 */ /// 判斷對象是否存在, obj參數(shù)是當(dāng)前屬性的字典 class func exsitsobject(obj:[string:string]) -> bool { //獲取管理數(shù)據(jù)對象的上下文 let context = xpstoremanager.shareinstance.managedobjectcontext //聲明一個數(shù)據(jù)請求 let fetchrequest = nsfetchrequest(entityname: "student") //組合過濾參數(shù) let stuid = obj["stuid"] let name = obj["name"] //方式一 let predicate1 = nspredicate(format: "stuid = %@", stuid!) let predicate2 = nspredicate(format: "name = %@", name!) //合成過濾條件 //or ,and, not , 意思是：或與非，懂?dāng)?shù)據(jù)庫的同學(xué)應(yīng)該就很容易明白 let predicate = nscompoundpredicate(orpredicatewithsubpredicates: [predicate1,predicate2]) //let predicate = nscompoundpredicate(andpredicatewithsubpredicates: [predicate1,predicate2]) fetchrequest.predicate = predicate //方式二 //fetchrequest.predicate = nspredicate(format: "stuid = %@ or name = %@", stuid!, name!) //fetchrequest.predicate = nspredicate(format: "stuid = %@ and name = %@", stuid!, name!) do{ let fetchobjects:[anyobject]? = try context.executefetchrequest(fetchrequest) return fetchobjects?.count > 0 ? true : false }catch { fatalerror("exsitsobject \(error)") } return false } /// 添加對象, obj參數(shù)是當(dāng)前屬性的字典 class func insertobject(obj: [string:string]) -> bool { //如果存在對象了就返回 if exsitsobject(obj) { return false } //獲取管理的數(shù)據(jù)上下文 對象 let context = xpstoremanager.shareinstance.managedobjectcontext //創(chuàng)建學(xué)生對象 let stu = nsentitydescription.insertnewobjectforentityforname("student", inmanagedobjectcontext: context) as! student //對象賦值 let sexstr:string if obj["sex"] == "男"{ sexstr = "1" }else{ sexstr = "0" } let numberfmt = nsnumberformatter() numberfmt.numberstyle = .nostyle stu.stuid = numberfmt.numberfromstring(obj["stuid"]!) stu.name = obj["name"] stu.createtime = nsdate() stu.sex = numberfmt.numberfromstring(sexstr) stu.classid = numberfmt.numberfromstring(obj["classid"]!) //保存 do { try context.save() print("保存成功！") return true } catch { fatalerror("不能保存：\(error)") } return false } /// 刪除對象 class func deleteobject(obj:student) -> bool{ //獲取管理的數(shù)據(jù)上下文 對象 let context = xpstoremanager.shareinstance.managedobjectcontext //方式一: 比如說列表已經(jīng)是從數(shù)據(jù)庫中獲取的對象，直接調(diào)用coredata默認(rèn)的刪除方法 context.deleteobject(obj) xpstoremanager.shareinstance.savecontext() //方式二：通過obj參數(shù)比如：id,name ,通過這樣的條件去查詢一個對象一個，把這個對象從數(shù)據(jù)庫中刪除 //代碼：略 return true } /// 更新對象 class func updateobject(obj:[string: string]) -> bool { //obj參數(shù)說明：當(dāng)前對象的要更新的字段信息，唯一標(biāo)志是必須的，其他的是可選屬性 let context = xpstoremanager.shareinstance.managedobjectcontext let oid = obj["stuid"] let student:student = self.fetchobjectbyid(int(oid!)!)! as! student //遍歷參數(shù)，然后替換相應(yīng)的參數(shù) let numberfmt = nsnumberformatter() numberfmt.numberstyle = .nostyle for key in obj.keys { switch key { case "name": student.name = obj["name"] case "classid": student.classid = numberfmt.numberfromstring(obj["classid"]!) default: print("如果有其他參數(shù)需要修改，類似") } } //執(zhí)行更新操作 do { try context.save() print("更新成功！") return true } catch { fatalerror("不能保存：\(error)") } return false } /// 查詢對象 class func fetchobjects(pageindex:int, pagesize:int) -> [anyobject]? { //獲取管理的數(shù)據(jù)上下文 對象 let context = xpstoremanager.shareinstance.managedobjectcontext //聲明數(shù)據(jù)的請求 let fetchrequest:nsfetchrequest = nsfetchrequest(entityname: "student") fetchrequest.fetchlimit = pagesize //每頁大小 fetchrequest.fetchoffset = pageindex * pagesize //第幾頁 //設(shè)置查詢條件:參考exsitsobject //let predicate = nspredicate(format: "id= '1' ", "") //fetchrequest.predicate = predicate //設(shè)置排序 //按學(xué)生id降序 let stuidsort = nssortdescriptor(key: "stuid", ascending: false) //按照姓名升序 let namesort = nssortdescriptor(key: "name", ascending: true) let sortdescriptors:[nssortdescriptor] = [stuidsort,namesort] fetchrequest.sortdescriptors = sortdescriptors //查詢操作 do { let fetchedobjects:[anyobject]? = try context.executefetchrequest(fetchrequest) //遍歷查詢的結(jié)果 /* for info:student in fetchedobjects as! [student]{ print("id=\(info.stuid)") print("name=\(info.name)") print("sex=\(info.sex)") print("classid=\(info.classid)") print("createtime=\(info.createtime)") print("-------------------") } */ return fetchedobjects } catch { fatalerror("不能保存：\(error)") } return nil } /// 根據(jù)id查詢當(dāng)個對象 class func fetchobjectbyid(oid:int) -> anyobject?{ //獲取上下文對象 let context = xpstoremanager.shareinstance.managedobjectcontext //創(chuàng)建查詢對象 let fetchrequest:nsfetchrequest = nsfetchrequest(entityname: "student") //構(gòu)造參數(shù) fetchrequest.predicate = nspredicate(format: "stuid = %@", string(oid)) //執(zhí)行代碼并返回結(jié)果 do{ let results:[anyobject]? = try context.executefetchrequest(fetchrequest) if results?.count > 0 { return results![0] } }catch{ fatalerror("查詢當(dāng)個對象致命錯誤：\(error)") } return nil }} |
4.viewcontroller.swift
具體使用：
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//// viewcontroller.swift// coredatademo//// created by cdmac on 16/9/11.// copyright © 2016年 pinguo. all rights reserved.// import uikit let cellidentifiler = "reusecell" class viewcontroller: uiviewcontroller { @iboutlet weak var txtno: uitextfield! @iboutlet weak var txtname: uitextfield! @iboutlet weak var txtsex: uitextfield! @iboutlet weak var txtclassid: uitextfield! @iboutlet weak var tableview: uitableview! var dataarray:[anyobject]? override func viewdidload() { super.viewdidload() // do any additional setup after loading the view, typically from a nib. self.dataarray = student.fetchobjects(0, pagesize: 20) self.tableview.reloaddata() } override func didreceivememorywarning() { super.didreceivememorywarning() // dispose of any resources that can be recreated. } @ibaction func addaction(sender: anyobject) { var dic = [string:string]() dic["stuid"] = txtno.text dic["name"] = txtname.text dic["sex"] = txtsex.text dic["classid"] = txtclassid.text if student.insertobject(dic) { print("添加成功") self.dataarray = student.fetchobjects(0,pagesize: 20) self.tableview.reloaddata() }else{ print("添加失敗") } } @ibaction func updateaction(sender: anyobject) { var dic = [string:string]() dic["stuid"] = txtno.text dic["name"] = txtname.text //dic["sex"] = txtsex.text dic["classid"] = txtclassid.text if student.updateobject(dic) { print("更新成功") self.dataarray = student.fetchobjects(0,pagesize: 20) self.tableview.reloaddata() }else{ print("更新失敗") } } } extension viewcontroller:uitableviewdelegate,uitableviewdatasource{ //表格有多少組 func numberofsectionsintableview(tableview: uitableview) -> int { return 1 } //每組多少行 func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int { if self.dataarray != nil && self.dataarray?.count > 0 { return self.dataarray!.count } return 0 } //高度 func tableview(tableview: uitableview, heightforrowatindexpath indexpath: nsindexpath) -> cgfloat { return 50 } //單元格加載 func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell { let cell = tableview.dequeuereusablecellwithidentifier(cellidentifiler) let stu:student = self.dataarray![indexpath.row] as! student let label1:uilabel = cell?.contentview.viewwithtag(10001) as! uilabel let label2:uilabel = cell?.contentview.viewwithtag(10002) as! uilabel var sexstr = "男" if stu.sex?.intvalue != 1 { sexstr = "女" } label1.text = "\(stu.stuid!) \(stu.name!) \(sexstr) \(stu.classid!)" label2.text = "http://xiaopin.cnblogs.com" return cell! } //選中 func tableview(tableview: uitableview, didselectrowatindexpath indexpath: nsindexpath) { } func tableview(tableview: uitableview, caneditrowatindexpath indexpath: nsindexpath) -> bool { return true } func tableview(tableview: uitableview, commiteditingstyle editingstyle: uitableviewcelleditingstyle, forrowatindexpath indexpath: nsindexpath) { if editingstyle == .delete { //獲取當(dāng)前對象 let student:student = self.dataarray![indexpath.row] as! student //刪除本地存儲 student.deleteobject(student) //刷新數(shù)據(jù)源 self.dataarray?.removeatindex(indexpath.row) //self.dataarray = student.fetchobjects(0, pagesize: 20) //刪除單元格 tableview.deleterowsatindexpaths([indexpath], withrowanimation: .automatic) } } func tableview(tableview: uitableview, editingstyleforrowatindexpath indexpath: nsindexpath) -> uitableviewcelleditingstyle { return .delete } func tableview(tableview: uitableview, titlefordeleteconfirmationbuttonforrowatindexpath indexpath: nsindexpath) -> string? { return "刪除" }} |
運(yùn)行效果圖
源碼下載：coredatademo.zip
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助，也希望大家多多支持服務(wù)器之家。
原文鏈接：http://www.cnblogs.com/xiaopin/archive/2016/09/18/5883203.html
