added feature fetching from url

iOSNetworkJSON/iOSNetworkJSON.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		262804D128498A5A000E1A24 /* CDHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = 262804D028498A5A000E1A24 /* CDHandler.swift */; };
 		2672E4CD2841747500D1D02C /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2672E4CC2841747500D1D02C /* AppDelegate.swift */; };
 		2672E4CF2841747500D1D02C /* SceneDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2672E4CE2841747500D1D02C /* SceneDelegate.swift */; };
 		2672E4D12841747500D1D02C /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2672E4D02841747500D1D02C /* ViewController.swift */; };
@@ -18,6 +19,7 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		262804D028498A5A000E1A24 /* CDHandler.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CDHandler.swift; sourceTree = "<group>"; };
 		2672E4C92841747500D1D02C /* iOSNetworkJSON.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = iOSNetworkJSON.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		2672E4CC2841747500D1D02C /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		2672E4CE2841747500D1D02C /* SceneDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SceneDelegate.swift; sourceTree = "<group>"; };
@@ -69,6 +71,7 @@
 				2672E4DA2841747600D1D02C /* LaunchScreen.storyboard */,
 				2672E4DD2841747600D1D02C /* Info.plist */,
 				2672E4D52841747500D1D02C /* iOSNetworkJSON.xcdatamodeld */,
+				262804D028498A5A000E1A24 /* CDHandler.swift */,
 			);
 			path = iOSNetworkJSON;
 			sourceTree = "<group>";
@@ -143,6 +146,7 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				262804D128498A5A000E1A24 /* CDHandler.swift in Sources */,
 				2672E4D12841747500D1D02C /* ViewController.swift in Sources */,
 				2672E4CD2841747500D1D02C /* AppDelegate.swift in Sources */,
 				26EE2CCF28419B02004C74AF /* ProductTableViewCell.swift in Sources */,

iOSNetworkJSON/iOSNetworkJSON/Base.lproj/Main.storyboard

@@ -27,16 +27,25 @@
                                             <rect key="frame" x="0.0" y="0.0" width="414" height="120"/>
                                             <autoresizingMask key="autoresizingMask"/>
                                             <subviews>
-                                                <textField opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="roundedRect" textAlignment="natural" minimumFontSize="17" translatesAutoresizingMaskIntoConstraints="NO" id="F0x-Vp-2XT">
-                                                    <rect key="frame" x="53" y="43" width="97" height="34"/>
-                                                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                                <textField opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="roundedRect" textAlignment="natural" minimumFontSize="17" translatesAutoresizingMaskIntoConstraints="NO" id="F0x-Vp-2XT">
+                                                    <rect key="frame" x="53" y="21" width="308" height="56"/>
+                                                    <constraints>
+                                                        <constraint firstAttribute="height" constant="34" id="2mV-m0-yp4"/>
+                                                        <constraint firstAttribute="width" constant="200" id="tBl-ow-DqZ"/>
+                                                    </constraints>
                                                     <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                                     <textInputTraits key="textInputTraits"/>
                                                 </textField>
                                             </subviews>
+                                            <constraints>
+                                                <constraint firstAttribute="trailingMargin" secondItem="F0x-Vp-2XT" secondAttribute="trailing" constant="33" id="537-Qt-N2b"/>
+                                                <constraint firstAttribute="bottomMargin" secondItem="F0x-Vp-2XT" secondAttribute="bottom" constant="32" id="EEb-so-rrb"/>
+                                                <constraint firstItem="F0x-Vp-2XT" firstAttribute="top" secondItem="ed9-dy-DXb" secondAttribute="topMargin" constant="10" id="WLa-XA-XUs"/>
+                                                <constraint firstItem="F0x-Vp-2XT" firstAttribute="leading" secondItem="ed9-dy-DXb" secondAttribute="leadingMargin" constant="33" id="cH9-lt-Egl"/>
+                                            </constraints>
                                         </tableViewCellContentView>
                                         <connections>
-                                            <outlet property="ProductDescription" destination="F0x-Vp-2XT" id="lo4-Q5-Rwu"/>
+                                            <outlet property="ProductDescription" destination="F0x-Vp-2XT" id="KTu-S0-rEO"/>
                                         </connections>
                                     </tableViewCell>
                                 </prototypes>

iOSNetworkJSON/iOSNetworkJSON/CDHandler.swift

+//
+//  CDHandler.swift
+//  iOSNetworkJSON
+//
+//  Created by xlu on 6/2/22.
+//
+
+import UIKit
+import CoreData
+
+class CDHandler {
+    private let viewContext: NSManagedObjectContext = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
+    
+    func add<T: NSManagedObject>(_ type: T.Type) -> T? {
+        guard let entityName = T.entity().name else {return nil}
+        guard let entity = NSEntityDescription.entity(forEntityName: entityName, in: viewContext) else {return nil}
+        let object = T(entity: entity, insertInto: viewContext)
+        return object
+    }
+    
+    func save(){
+        do {
+            try viewContext.save()
+        }catch {
+            print(error.localizedDescription)
+        }
+    }
+}

iOSNetworkJSON/iOSNetworkJSON/ViewController.swift

@@ -6,6 +6,7 @@
 //
 
 import UIKit
+import CoreData
 
 
 struct ProductStore: Codable {
@@ -31,17 +32,26 @@ struct Product: Codable {
 
 class ViewController: UIViewController{
     
+    let coreDataHandler = CDHandler()
+    
     @IBOutlet weak var tableView: UITableView!
     
     var allProducts = [Product]()
 
     override func viewDidLoad() {
         super.viewDidLoad()
-        getAllProducts()
+        getAllProducts(productCompletionHandler: {productall, error in
+            if let products = productall?.products{
+                self.allProducts = products
+                DispatchQueue.main.async {
+                    self.tableView.reloadData()
+                }
+            }
+        })
         
     }
     
-    private func getAllProducts(){
+    private func getAllProducts(productCompletionHandler: @escaping (ProductStore?, Error?) -> Void){
         guard let url = URL(string: "https://dummyjson.com/products") else{
             fatalError("URL Failed")
         }
@@ -51,13 +61,8 @@ class ViewController: UIViewController{
                 guard let productall = try? JSONDecoder().decode(ProductStore.self, from: data)else{
                     fatalError("decode error")
                 }
-                for element in productall.products {
-                    self.allProducts.append(element)
-                }
-            }
-            
-            DispatchQueue.main.async { [self] in
-                tableView.reloadData()
+                productCompletionHandler(productall, nil)
+                
             }
         }.resume()
     }

iOSNetworkJSON/iOSNetworkJSON/iOSNetworkJSON.xcdatamodeld/iOSNetworkJSON.xcdatamodel/contents

 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="17709" systemVersion="19H1715" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
-    <entity name="Entity" representedClassName="Entity" syncable="YES" codeGenerationType="class"/>
+    <entity name="SavedProduct" representedClassName=".SavedProduct" syncable="YES" codeGenerationType="class">
+        <attribute name="attribute" optional="YES"/>
+        <attribute name="brand" optional="YES" attributeType="String"/>
+        <attribute name="id" optional="YES" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES"/>
+        <attribute name="title" optional="YES" attributeType="String"/>
+    </entity>
     <elements>
-        <element name="Entity" positionX="-63" positionY="-18" width="128" height="43"/>
+        <element name="SavedProduct" positionX="-63" positionY="-18" width="128" height="103"/>
     </elements>
 </model>
\ No newline at end of file