我有一个快速的编码问题。首先，我使用XCode 8和swift 2.这是我的viewcontroller的快速图像，以便您可以获得更好的主意。 Image of my viewcontroller
在上图中，您插入一个目标（文本字段中的文本）并按提交。提交按钮（“提交目标”）将文本字段中的文本插入到数组中。然后，此数组将显示在tableview中。
我的问题是，如何将NSUserDefualts实现到此viewcontroller中以保存数组？如果用户从tableview中删除其中一个目标，则还需要能够更新阵列。
以下是我的viewcontroller代码：
//
// VCWeeklyGoals.swift
// FitNote
//
// Created by ---- on 9/21/16.
// Copyright © 2016 Haiden Stiles. All rights reserved.
//
import UIKit
class VCWeeklyGoals: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate {
//MARK: Properties
//DATE AND TIME
@IBOutlet weak var labelDate: UILabel!
var timer = NSTimer()
@objc func tick() {
labelDate.text = NSDateFormatter.localizedStringFromDate(NSDate(), dateStyle: .MediumStyle, timeStyle: .MediumStyle)
}
//END DATE AND TIME
//BEGINNING ROUNDED BUTTONS FOR MONDAY THROUGH FRIDAY
//@IBOutlet weak var roundedButtonMonday: UIButton!
//ROUNDED BUTTON FOR SUBMIT GOAL
@IBOutlet weak var roundedButtonSubmitGoal: UIButton!
//END ROUNDED BUTTON FOR SUBMIT GOAL
//END ROUNDED BUTTONS FOR MONDAY THROUGH FRIDAY
//BEGINNING OF TABLE FUNCTIONS AND PROPERTIES
@IBOutlet var tableView: UITableView!
@IBOutlet var insertedGoal: UITextField!
//var tableTitles = NSUserDefaults.standardUserDefaults().arrayForKey("tableTitles") as! [String]
var tableTitles = [String]()
@IBAction func buttonSubmitGoal(sender: UIButton) {
self.view.endEditing(true)
var error = ""
if insertedGoal.text == "" {
error = "Please enter a goal!"
} else {
tableTitles.append(insertedGoal.text!)
self.tableView.reloadData()
}
if error != "" {
let alert = UIAlertController(title:"Error In Form", message: error, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title:"OK", style: .Default, handler: { action in
//self.dismissViewControllerAnimated(true, completion:nil)
}))
self.presentViewController(alert, animated:true, completion:nil)
}
insertedGoal.text = ""
}
//func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// return 1
//}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tableTitles.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell{
let cell : UITableViewCell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell
let object = tableTitles[indexPath.row]
cell.textLabel!.text = object
return cell
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == UITableViewCellEditingStyle.Delete {
tableTitles.removeAtIndex(indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
}
}
//END OF TABLE FUNCTIONS AND PROPERTIES
//OVERRIDE FUNCTIONS
override func viewDidLoad() {
super.viewDidLoad()
if let temp = NSUserDefaults.standardUserDefaults().objectForKey("tableTitles") as? [String] {
tableTitles = temp
}
// Do any additional setup after loading the view.
//TABLE PROPERTIES
self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")
self.insertedGoal.delegate = self
tableView.delegate = self
tableView.dataSource = self
//END TABLE PROPERTIES
//DATE PROPERTIES
timer = NSTimer.scheduledTimerWithTimeInterval(1.0,
target: self,
selector: #selector(tick),
userInfo: nil,
repeats: true)
//END DATE PROPERTIES
//ROUNDED BUTTON FOR MONDAY THROUGH FRIDAY PROPERTIES
//MONDAY
//roundedButtonMonday.backgroundColor = UIColor.whiteColor()
//roundedButtonMonday.layer.cornerRadius = 6
//roundedButtonMonday.layer.borderWidth = 0.5
//roundedButtonMonday.layer.borderColor = UIColor.blueColor().CGColor
//ROUNDED BUTTON FOR SUBMIT GOAL
roundedButtonSubmitGoal.backgroundColor = UIColor.clearColor()
roundedButtonSubmitGoal.layer.cornerRadius = 7
roundedButtonSubmitGoal.layer.borderWidth = 1
roundedButtonSubmitGoal.layer.borderColor = UIColor.blueColor().CGColor
//END ROUNDED BUTTON FOR SUBMIT GOAL
//END ROUNDED BUTTON FOR MONDAY THROUGH FRIDAY PROPERTIES
//DATE PICKER
//END DATE PICKER
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
答案 0 :(得分：0)
我一直在研究你的问题，这是我的解决方案
首先我创建一个目标模型，是一个简单的模型，这只有目标的文本，还有两个静态方法，一个用于保存，另一个用于加载
class Goal: NSObject {
var text : String = ""
init(text: String) {
super.init()
self.text = text
}
static func loadFromFile(fileName:String) ->[Goal]?
{
let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true);
let docsDirectory = paths[0];
let path = docsDirectory + "/" + fileName;
let data = NSArray(contentsOfFile: path);
if(data != nil)
{
var returnArray : [Goal] = []
for object in data! {
returnArray.append(Goal(text: object as! String))
}
return returnArray
}
return nil
}
static func saveToPlist(filename:String,goals:[Goal]) -> Bool {
let toSaveArray = NSMutableArray();
for goal in goals {
toSaveArray.add(goal.text)
}
let paths = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.documentDirectory, FileManager.SearchPathDomainMask.userDomainMask, true);
let docsDirectory = paths[0];
let path = docsDirectory + "/" + filename;
return toSaveArray.write(toFile: path, atomically: true);
}
}
这是我在ViewController上的实现，GoalTableViewCell是一个只有一个UILabel
import UIKit
class ViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
@IBOutlet weak var tfGoalTextAdd: UITextField!
@IBOutlet weak var btnAdd: UIButton!
@IBOutlet weak var tableView: UITableView!
var goals : [Goal] = []
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.tableView.estimatedRowHeight = 40;
self.loadGoals()
self.btnAdd.addTarget(self, action: #selector(addGoalWithTextFieldText), for: .touchUpInside)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
public func loadGoals()
{
if let arrayGoals = Goal.loadFromFile(fileName: "goals")
{
self.goals = arrayGoals
}
}
public func addGoalWithTextFieldText()
{
if(self.tfGoalTextAdd.text != nil && self.tfGoalTextAdd.text != "")
{
self.addGoal(text: self.tfGoalTextAdd.text!)
self.tfGoalTextAdd.text = ""
}
}
public func addGoal(text: String)
{
self.goals.append(Goal(text: text))
self.tableView.reloadData()
if(Goal.saveToPlist(filename: "goals", goals: goals))
{
debugPrint("Successful saved")
}
}
public func removeGoal(goal:Goal)
{
goals.remove(at:goals.index(of: goal)!)
self.tableView.reloadData()
if(Goal.saveToPlist(filename: "goals", goals: goals))
{
debugPrint("Successful saved")
}
}
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return self.goals.count
}
public func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return UITableViewAutomaticDimension
}
// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:
// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "GoalCell") as! GoalTableViewCell
cell.setupWithGoal(goal: self.goals[indexPath.row])
return cell
}
public func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
public func tableView(_ tableView: UITableView, editingStyleForRowAt indexPath: IndexPath) -> UITableViewCellEditingStyle {
return .delete
}
public func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// Delete the row from the data source
//tableView.beginUpdates()
self.removeGoal(goal: self.goals[indexPath.row])
//tableView.endUpdates()
} 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
}
}
}
我希望这有助于你