lazy loading and image caching demo

This is just an introduction to the concept of lazy loading, the code however should not be used in production releases.
Dhruvil-sim · Jul 26, 2020 · c6f8b98 · c6f8b98
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diff --git a/lazyLoadingDemo/lazyLoadingDemo.xcodeproj/project.pbxproj b/lazyLoadingDemo/lazyLoadingDemo.xcodeproj/project.pbxproj
diff --git a/lazyLoadingDemo/lazyLoadingDemo.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/lazyLoadingDemo/lazyLoadingDemo.xcodeproj/project.xcworkspace/contents.xcworkspacedata
diff --git a/...gDemo/lazyLoadingDemo.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/...gDemo/lazyLoadingDemo.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/...proj/project.xcworkspace/xcuserdata/ravirdixit.xcuserdatad/UserInterfaceState.xcuserstate b/...proj/project.xcworkspace/xcuserdata/ravirdixit.xcuserdatad/UserInterfaceState.xcuserstate
diff --git a/...dingDemo.xcodeproj/xcuserdata/ravirdixit.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist b/...dingDemo.xcodeproj/xcuserdata/ravirdixit.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Bucket
+   uuid = "1C5518F8-3F0B-4A30-9724-E28503C1D2DC"
+   type = "1"
+   version = "2.0">
+</Bucket>
diff --git a/...oadingDemo.xcodeproj/xcuserdata/ravirdixit.xcuserdatad/xcschemes/xcschememanagement.plist b/...oadingDemo.xcodeproj/xcuserdata/ravirdixit.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>lazyLoadingDemo.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>
diff --git a/lazyLoadingDemo/lazyLoadingDemo/AppDelegate.swift b/lazyLoadingDemo/lazyLoadingDemo/AppDelegate.swift
@@ -0,0 +1,37 @@
+//
+//  AppDelegate.swift
+//  lazyLoadingDemo
+//
+//  Created by CodeCat15 on 7/24/20.
+//  Copyright © 2020 CodeCat15. All rights reserved.
+//
+
+import UIKit
+
+@UIApplicationMain
+class AppDelegate: UIResponder, UIApplicationDelegate {
+
+
+
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
+        // Override point for customization after application launch.
+        return true
+    }
+
+    // MARK: UISceneSession Lifecycle
+
+    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
+        // Called when a new scene session is being created.
+        // Use this method to select a configuration to create the new scene with.
+        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
+    }
+
+    func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
+        // Called when the user discards a scene session.
+        // If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
+        // Use this method to release any resources that were specific to the discarded scenes, as they will not return.
+    }
+
+
+}
+
diff --git a/lazyLoadingDemo/lazyLoadingDemo/Assets.xcassets/AppIcon.appiconset/Contents.json b/lazyLoadingDemo/lazyLoadingDemo/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/lazyLoadingDemo/lazyLoadingDemo/Assets.xcassets/Contents.json b/lazyLoadingDemo/lazyLoadingDemo/Assets.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/...o/lazyLoadingDemo/Assets.xcassets/LaunchImage.imageset/Black on Transparent.png b/...o/lazyLoadingDemo/Assets.xcassets/LaunchImage.imageset/Black on Transparent.png
diff --git a/lazyLoadingDemo/lazyLoadingDemo/Assets.xcassets/LaunchImage.imageset/Contents.json b/lazyLoadingDemo/lazyLoadingDemo/Assets.xcassets/LaunchImage.imageset/Contents.json
@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "filename" : "Black on Transparent.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/lazyLoadingDemo/lazyLoadingDemo/Base.lproj/LaunchScreen.storyboard b/lazyLoadingDemo/lazyLoadingDemo/Base.lproj/LaunchScreen.storyboard
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="16097.2" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <device id="retina6_1" orientation="portrait" appearance="light"/>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="16087"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="Z9A-eT-erv">
+                                <rect key="frame" x="0.0" y="44" width="414" height="818"/>
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <constraints>
+                            <constraint firstItem="Z9A-eT-erv" firstAttribute="top" secondItem="6Tk-OE-BBY" secondAttribute="top" id="4W2-BQ-mLL"/>
+                            <constraint firstItem="Z9A-eT-erv" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" id="8t9-4H-wlf"/>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="bottom" secondItem="Z9A-eT-erv" secondAttribute="bottom" id="PQR-yr-m33"/>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="Z9A-eT-erv" secondAttribute="trailing" id="ol7-AY-8Rw"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-4" y="193"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="5000" height="3828"/>
+    </resources>
+</document>
diff --git a/lazyLoadingDemo/lazyLoadingDemo/Base.lproj/Main.storyboard b/lazyLoadingDemo/lazyLoadingDemo/Base.lproj/Main.storyboard
@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="16097.2" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <device id="retina6_1" orientation="portrait" appearance="light"/>
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="16087"/>
+        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
+    </dependencies>
+    <scenes>
+        <!--AnimalsVC-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="AnimalsVC" customModule="lazyLoadingDemo" customModuleProvider="target" sceneMemberID="viewController">
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="414" height="896"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="U0v-Mr-ggv">
+                                <rect key="frame" x="0.0" y="44" width="414" height="818"/>
+                                <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                                <prototypes>
+                                    <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" selectionStyle="blue" hidesAccessoryWhenEditing="NO" indentationLevel="1" indentationWidth="0.0" reuseIdentifier="animalsCell" rowHeight="140" id="wIX-8u-AJd" customClass="AnimalsTC" customModule="lazyLoadingDemo" customModuleProvider="target">
+                                        <rect key="frame" x="0.0" y="28" width="414" height="140"/>
+                                        <autoresizingMask key="autoresizingMask"/>
+                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="wIX-8u-AJd" id="rxl-8H-qYQ">
+                                            <rect key="frame" x="0.0" y="0.0" width="414" height="140"/>
+                                            <autoresizingMask key="autoresizingMask"/>
+                                            <subviews>
+                                                <imageView clipsSubviews="YES" userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="AFm-Of-0bs" customClass="LazyImageView" customModule="lazyLoadingDemo" customModuleProvider="target">
+                                                    <rect key="frame" x="20" y="20" width="100" height="100"/>
+                                                </imageView>
+                                                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="amh-Tt-V27">
+                                                    <rect key="frame" x="144" y="57" width="250" height="26"/>
+                                                    <constraints>
+                                                        <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="250" id="zCk-mq-Hju"/>
+                                                    </constraints>
+                                                    <fontDescription key="fontDescription" type="system" pointSize="22"/>
+                                                    <nil key="textColor"/>
+                                                    <nil key="highlightedColor"/>
+                                                </label>
+                                            </subviews>
+                                            <constraints>
+                                                <constraint firstItem="AFm-Of-0bs" firstAttribute="leading" secondItem="rxl-8H-qYQ" secondAttribute="leadingMargin" id="1Xh-Al-aMQ"/>
+                                                <constraint firstItem="amh-Tt-V27" firstAttribute="leading" secondItem="AFm-Of-0bs" secondAttribute="trailing" constant="24" id="Hvf-cQ-JAi"/>
+                                                <constraint firstItem="AFm-Of-0bs" firstAttribute="top" secondItem="rxl-8H-qYQ" secondAttribute="topMargin" constant="9" id="MaB-F7-xsw"/>
+                                                <constraint firstItem="amh-Tt-V27" firstAttribute="trailing" secondItem="rxl-8H-qYQ" secondAttribute="trailingMargin" id="NKN-SX-yUd"/>
+                                                <constraint firstItem="amh-Tt-V27" firstAttribute="centerY" secondItem="AFm-Of-0bs" secondAttribute="centerY" id="Z3x-WM-mTa"/>
+                                                <constraint firstItem="amh-Tt-V27" firstAttribute="centerY" secondItem="rxl-8H-qYQ" secondAttribute="centerY" id="Zty-63-cbs"/>
+                                                <constraint firstItem="amh-Tt-V27" firstAttribute="top" secondItem="rxl-8H-qYQ" secondAttribute="topMargin" constant="46" id="iu6-Hg-e4J"/>
+                                            </constraints>
+                                        </tableViewCellContentView>
+                                        <connections>
+                                            <outlet property="imgAnimal" destination="AFm-Of-0bs" id="58h-aF-SkM"/>
+                                            <outlet property="lblName" destination="amh-Tt-V27" id="cFK-xe-3EZ"/>
+                                        </connections>
+                                    </tableViewCell>
+                                </prototypes>
+                                <connections>
+                                    <outlet property="dataSource" destination="BYZ-38-t0r" id="ms7-Vg-psM"/>
+                                    <outlet property="delegate" destination="BYZ-38-t0r" id="dMj-nW-T1s"/>
+                                </connections>
+                            </tableView>
+                        </subviews>
+                        <color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
+                        <constraints>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="bottom" secondItem="U0v-Mr-ggv" secondAttribute="bottom" id="AtJ-Wg-rBb"/>
+                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="U0v-Mr-ggv" secondAttribute="trailing" id="Dsp-k9-yTY"/>
+                            <constraint firstItem="U0v-Mr-ggv" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" id="aQg-0c-iqZ"/>
+                            <constraint firstItem="U0v-Mr-ggv" firstAttribute="top" secondItem="6Tk-OE-BBY" secondAttribute="top" id="qF1-J6-udY"/>
+                        </constraints>
+                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
+                    </view>
+                    <connections>
+                        <outlet property="tblAnimalList" destination="U0v-Mr-ggv" id="LBU-aX-rBB"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="-436.23188405797106" y="-234.375"/>
+        </scene>
+    </scenes>
+</document>
diff --git a/lazyLoadingDemo/lazyLoadingDemo/Controllers/AnimalsTC.swift b/lazyLoadingDemo/lazyLoadingDemo/Controllers/AnimalsTC.swift
@@ -0,0 +1,27 @@
+//
+//  HerosTC.swift
+//  lazyLoadingDemo
+//
+//  Created by CodeCat15 on 7/24/20.
+//  Copyright © 2020 CodeCat15. All rights reserved.
+//
+
+import UIKit
+
+class AnimalsTC: UITableViewCell {
+
+    @IBOutlet weak var imgAnimal: LazyImageView!
+    @IBOutlet weak var lblName: UILabel!
+
+    override func awakeFromNib() {
+        super.awakeFromNib()
+        // Initialization code
+    }
+
+    override func setSelected(_ selected: Bool, animated: Bool) {
+        super.setSelected(selected, animated: animated)
+
+        // Configure the view for the selected state
+    }
+
+}