ios - 想将数据保存在 nsuserdefault 中并将其传输到另一个 Controller 的 TableView 中

Question

我有一个 detailviewcontroller 文件，其中有一个 ImageView 、一个文本字段、一个 TextView 和一个日期选择器。 ImageView 图像让我从第一个 Controller 。当我填写文本字段、 TextView 、选择日期等剩余数据时，然后当我单击导航栏中的保存按钮时，数据应保存在 nsuserdefault 中并传递到另一个 Controller 的 TableView 。当我再次启动应用程序并再次填写详细信息时，该数据和以前的数据也应该在那里。不知道该怎么做

我的 Storyboard:

我的 detailviewcontroller 文件:

class DetailsViewController: UIViewController{

    var picker : UIDatePicker = UIDatePicker()

    @IBOutlet weak var selectedDate: UIButton!
    @IBOutlet weak var detailsVCImage: UIImageView!

    @IBOutlet weak var geoAddressLabel: UILabel!
    @IBOutlet weak var titleTF: UITextField!
    @IBOutlet weak var notesTextView: CustomTextView!

    var mapView:GMSMapView!
    var transferedImage:UIImage!

    var arrayList = [[String:Any]]()
    var obj = [String:Any]()


    override func viewDidLoad() {
        super.viewDidLoad()

        notesTextView.text = "Please enter Notes...."
        notesTextView.textColor = .lightGray


        detailsVCImage.image = transferedImage

        hideKeyboardWhenTapped()
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        dismiss(animated: true)
    }


    @IBAction func datePickerTapped(_ sender: Any) {

        picker.datePickerMode = UIDatePickerMode.dateAndTime
        picker.addTarget(self, action: #selector(dueDateChanged(sender:)), for: UIControlEvents.valueChanged)
//        self.picker = UIDatePicker(frame:CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: 85))

        let pickerSize : CGSize = picker.sizeThatFits(CGSize.zero)
        picker.frame = CGRect(x:0.0, y:442, width:pickerSize.width, height:85)
        //width: 288
        self.view.addSubview(picker)

    }

    @objc func dueDateChanged(sender:UIDatePicker){
        let dateFormatter = DateFormatter()
        dateFormatter.dateStyle = .short
        dateFormatter.timeStyle = .short
        selectedDate.setTitle(dateFormatter.string(from: sender.date), for: .normal)

    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        picker.removeFromSuperview()
    }

    @IBAction func saveDataTaopped(_ sender: Any) {
        obj["title"] = titleTF.text
        obj["notes"] = notesTextView.text
        obj["image"] = transferedImage
        obj["date"] = selectedDate

        arrayList.append(obj)

    }

    func reverseGeocodeCoordinate(_ coordinate: CLLocationCoordinate2D) {
        let geocoder = GMSGeocoder()

        geocoder.reverseGeocodeCoordinate(coordinate) { response, error in
            //            self.geoAddressLabel.unlock()


            guard let address = response?.firstResult(), let lines = address.lines else {
                return
            }

            self.geoAddressLabel.text = lines.joined(separator: "\n")

            let labelHeight = self.geoAddressLabel.intrinsicContentSize.height
            ////            self.mapView.padding = UIEdgeInsets(top: self.view.safeAreaInsets.top, left: 0,
            //                                                bottom: labelHeight, right: 0)
            //
            //            UIView.animate(withDuration: 0.25) {
            //                self.pinImageVerticalConstraint.constant = ((labelHeight - self.view.safeAreaInsets.top) * 0.5)
            //                self.view.layoutIfNeeded()
            //            }
        }

    }


    @IBAction func getLocationAddress(_ sender: Any) {
//        reverseGeocodeCoordinate(target)

    }
}

extension DetailsViewController: UITextFieldDelegate {
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }

    func hideKeyboardWhenTapped () {
        let tap:UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(DetailsViewController.dismissKeyboard))
        tap.cancelsTouchesInView = false
        view.addGestureRecognizer(tap)
    }

    func dismissKeyboard() {
        view.endEditing(true)
    }
}

extension DetailsViewController: GMSMapViewDelegate {
    func mapView(_ mapView: GMSMapView, idleAt position: GMSCameraPosition) {
//        reverseGeocodeCoordinate(position.target)
    }

//    func mapView(_ mapView: GMSMapView, willMove gesture: Bool) {
//        geoAddressLabel.lock()
//        
//        if (gesture) {
//            mapCenterPinImage.fadeIn(0.25)
//            mapView.selectedMarker = nil
//        }
//    }

}

我的 listtableviewcontroller 文件:

class ListTableViewController: UITableViewController {

    @IBOutlet weak var listImage: UIImageView!
    @IBOutlet weak var listTitle: UILabel!
    @IBOutlet weak var listNotes: UITextView!
    @IBOutlet weak var listDate: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Uncomment the following line to preserve selection between presentations
        // self.clearsSelectionOnViewWillAppear = false

        // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
        // self.navigationItem.rightBarButtonItem = self.editButtonItem()
    }



    override func numberOfSections(in tableView: UITableView) -> Int {
        // #warning Incomplete implementation, return the number of sections
        return 0
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete implementation, return the number of rows
        return 0
    }

Answer 1

使用核心数据

ViewController.swift

import UIKit
import CoreData

class ViewController: UIViewController {

    @IBOutlet weak var imgVw: UIImageView!
    @IBOutlet weak var titleTxt: UITextField!
    @IBOutlet weak var descTxt: UITextView!
    @IBOutlet weak var dateTxt: UIDatePicker!

    var idd: UInt64 = 0

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        self.clearContent()

        let tap: UITapGestureRecognizer =     UITapGestureRecognizer(target: self, action:    #selector(
            dismissKeyboard))
        tap.cancelsTouchesInView = false
        view.addGestureRecognizer(tap)
    }

    @objc func dismissKeyboard() {
        view.endEditing(true)
    }

    @IBAction func SaveClk(_ sender: Any) {
        idd = Date().ticks

        let appDelegate = UIApplication.shared.delegate as! AppDelegate
        let context = appDelegate.persistentContainer.viewContext
        let entity = NSEntityDescription.entity(forEntityName: "Product", in: context)
        let newUser = NSManagedObject(entity: entity!, insertInto: context)
        let imageData: NSData = (imgVw.image)!.pngData()! as NSData

        newUser.setValue(dateTxt.date, forKey: "pDate")
        newUser.setValue(descTxt.text, forKey: "pDesc")
        newUser.setValue(titleTxt.text, forKey: "pTitle")
        newUser.setValue(String(idd), forKey: "pid")
        newUser.setValue(imageData, forKey: "pimg")

        do {

            try context.save()

            let alertController = UIAlertController(title: "Alert", message: "Added!", preferredStyle: .alert)

            let OKAction = UIAlertAction(title: "OK", style: .default) { (action:UIAlertAction!) in

                // Code in this block will trigger when OK button tapped.
                self.clearContent()

                let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
                let nextViewController = storyBoard.instantiateViewController(withIdentifier: "DetailsViewControllerID") as! DetailsViewController
                self.navigationController?.pushViewController(nextViewController, animated: true)
            }

            alertController.addAction(OKAction)
            self.present(alertController, animated: true, completion:nil)

        } catch {

            print("Failed saving")

        }

    }

    func clearContent(){
        self.descTxt.text = ""
        self.titleTxt.text = ""
        self.imgVw.image = UIImage(named: "profImage")
    }

    @IBAction func CamClk(_ sender: Any) {
        CameraHandler.shared.showActionSheet(vc: self)
        CameraHandler.shared.imagePickedBlock = { (image) in
            self.imgVw.image = image
        }
    }

    @IBAction func NxtVw(_ sender: Any) {
        let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
        let nextViewController = storyBoard.instantiateViewController(withIdentifier: "DetailsViewControllerID") as! DetailsViewController
        self.navigationController?.pushViewController(nextViewController, animated: true)
    }

}

extension Date {
    var ticks: UInt64 {
        return UInt64((self.timeIntervalSince1970 + 62_135_596_800) * 10_000_000)
    }
}

DetailsViewController.swift

import UIKit
import CoreData

class DetailsViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {

    var result: [NSManagedObject] = []
    @IBOutlet weak var tblList: UITableView!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.fetchData()
        self.tblList.reloadData()
        // Do any additional setup after loading the view.
    }

    func fetchData() {
        let appDelegate = UIApplication.shared.delegate as! AppDelegate
        let managedContext = appDelegate.persistentContainer.viewContext
        let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "Product")
        do {
            result = try managedContext.fetch(fetchRequest)
        } catch let error as NSError {
            print("Could not fetch. \(error), \(error.userInfo)")
        }
    }

    // MARk: - tableViewDelegate

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return result.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

        let record = result[indexPath.row]
        let cell:listData = tableView.dequeueReusableCell(withIdentifier: "CellID", for: indexPath as IndexPath) as! listData

        cell.lblTitle.text = record.value(forKeyPath: "pTitle") as? String

        let formatter = DateFormatter()
        formatter.dateFormat = "dd-MMM-yyyy"
        let myString = formatter.string(from: record.value(forKeyPath: "pDate") as! Date)
        cell.lblDate.text = myString

        cell.lblDesc.text = record.value(forKeyPath: "pDesc") as? String

        cell.imgPro.image = UIImage(data: (record.value(forKey:"pimg") as! Data), scale: 1.0)

        return cell
    }

    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {

        if editingStyle == .delete {
            let record = result[indexPath.row]

            let appDelegate = UIApplication.shared.delegate as! AppDelegate
            let context = appDelegate.persistentContainer.viewContext
            let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Product")
            request.predicate = NSPredicate(format: "pid = %@", (record.value(forKeyPath: "pid") as? String)!)
            request.returnsObjectsAsFaults = false

            do {
                let objects = try context.fetch(request)
                for object in objects {
                    context.delete(object as! NSManagedObject)
                }
                try context.save()
            } catch _ {
                // error handling
            }
            fetchData()
            tblList.reloadData()
        }

    }

    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destination.
        // Pass the selected object to the new view controller.
    }
    */

}

class listData: UITableViewCell {
    @IBOutlet weak var lblTitle: UILabel!
    @IBOutlet weak var lblDate: UILabel!
    @IBOutlet weak var lblDesc: UILabel!
    @IBOutlet weak var imgPro: UIImageView!
}

CameraHandler.swift

import UIKit
import Foundation

class CameraHandler: NSObject {
    static let shared = CameraHandler()

    fileprivate var currentVC: UIViewController!

    //MARK: Internal Properties
    var imagePickedBlock: ((UIImage) -> Void)?

    func camera()
    {
        if UIImagePickerController.isSourceTypeAvailable(.camera){
            let myPickerController = UIImagePickerController()
            myPickerController.delegate = self;
            myPickerController.allowsEditing = true
            myPickerController.sourceType = .camera
            currentVC.present(myPickerController, animated: true, completion: nil)
        }

    }

    func photoLibrary()
    {

        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary){
            let myPickerController = UIImagePickerController()
            myPickerController.delegate = self;
            myPickerController.allowsEditing = true
            myPickerController.sourceType = .photoLibrary
            currentVC.present(myPickerController, animated: true, completion: nil)
        }

    }

    func showActionSheet(vc: UIViewController) {
        currentVC = vc
        let actionSheet = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)

        actionSheet.addAction(UIAlertAction(title: "Camera", style: .default, handler: { (alert:UIAlertAction!) -> Void in
            self.camera()
        }))

        actionSheet.addAction(UIAlertAction(title: "Gallery", style: .default, handler: { (alert:UIAlertAction!) -> Void in
            self.photoLibrary()
        }))

        actionSheet.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))

        vc.present(actionSheet, animated: true, completion: nil)
    }

}


extension CameraHandler: UIImagePickerControllerDelegate, UINavigationControllerDelegate{

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        currentVC.dismiss(animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
        if let image = info[UIImagePickerController.InfoKey.editedImage] as? UIImage {
            self.imagePickedBlock?(image)
        }else{
            print("Something went wrong")
        }
        currentVC.dismiss(animated: true, completion: nil)
    }

}

AppDelegate.swift

import UIKit
import CoreData

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }

    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    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.
        self.saveContext()
    }

    // MARK: - Core Data stack

    lazy var persistentContainer: NSPersistentContainer = {
        /*
         The persistent container for the application. This implementation
         creates and returns a container, having loaded 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.
        */
        let container = NSPersistentContainer(name: "CoreData_Sample")
        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
            if let error = error as NSError? {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() 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.

                /*
                 Typical reasons for an error here include:
                 * The parent directory does not exist, cannot be created, or disallows writing.
                 * The persistent store is not accessible, due to permissions or data protection when the device is locked.
                 * The device is out of space.
                 * The store could not be migrated to the current model version.
                 Check the error message to determine what the actual problem was.
                 */
                fatalError("Unresolved error \(error), \(error.userInfo)")
            }
        })
        return container
    }()

    // MARK: - Core Data Saving support

    func saveContext () {
        let context = persistentContainer.viewContext
        if context.hasChanges {
            do {
                try context.save()
            } catch {
                // Replace this implementation with code to handle the error appropriately.
                // fatalError() 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
                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
            }
        }
    }

}

输出