Merge pull request #6 from codecat15/multipart-form-data-format

adding the lazy image view with NSCache implementation

Author: codecat15

HttpUtility.xcodeproj/project.pbxproj

@@ -7,7 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		86171D7C24C7330000D71D06 /* UIImageViewExtension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 86171D7B24C7330000D71D06 /* UIImageViewExtension.swift */; };
+		86277C2024CB399B0078EB37 /* LazyImageView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 86277C1F24CB399B0078EB37 /* LazyImageView.swift */; };
 		8656BC582483E3C60023549D /* EncodableExtension.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8656BC572483E3C60023549D /* EncodableExtension.swift */; };
 		8656BC5B2483E43D0023549D /* EncodableExtensionUnitTest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8656BC5A2483E43D0023549D /* EncodableExtensionUnitTest.swift */; };
 		8656BC5E2484313F0023549D /* HttpUtilityIntegrationTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 8656BC5D2484313F0023549D /* HttpUtilityIntegrationTests.swift */; };
@@ -29,7 +29,7 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
-		86171D7B24C7330000D71D06 /* UIImageViewExtension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UIImageViewExtension.swift; sourceTree = "<group>"; };
+		86277C1F24CB399B0078EB37 /* LazyImageView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LazyImageView.swift; sourceTree = "<group>"; };
 		8656BC572483E3C60023549D /* EncodableExtension.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EncodableExtension.swift; sourceTree = "<group>"; };
 		8656BC5A2483E43D0023549D /* EncodableExtensionUnitTest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = EncodableExtensionUnitTest.swift; sourceTree = "<group>"; };
 		8656BC5D2484313F0023549D /* HttpUtilityIntegrationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HttpUtilityIntegrationTests.swift; sourceTree = "<group>"; };
@@ -66,7 +66,7 @@
 			isa = PBXGroup;
 			children = (
 				8656BC572483E3C60023549D /* EncodableExtension.swift */,
-				86171D7B24C7330000D71D06 /* UIImageViewExtension.swift */,
+				86277C1F24CB399B0078EB37 /* LazyImageView.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -246,9 +246,9 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				86277C2024CB399B0078EB37 /* LazyImageView.swift in Sources */,
 				86719EB124720E40002A2AB0 /* HttpUtility.swift in Sources */,
 				8656BC582483E3C60023549D /* EncodableExtension.swift in Sources */,
-				86171D7C24C7330000D71D06 /* UIImageViewExtension.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

HttpUtility/Extensions/LazyImageView.swift

@@ -0,0 +1,38 @@
+//
+//  LazyImageView.swift
+//  HttpUtility
+//
+//  Created by CodeCat15 on 7/24/20.
+//  Copyright © 2020 CodeCat15. All rights reserved.
+//
+
+import Foundation
+import UIKit
+
+class LazyImageView: UIImageView
+{
+    private let imageCache = NSCache<AnyObject, UIImage>()
+
+    func loadImage(fromURL imageUrl: URL, placeHolderName: String)
+    {
+        self.image = UIImage(named: placeHolderName)
+
+        // loading the images from cache
+        if let cachedImage = imageCache.object(forKey: imageUrl as AnyObject){
+            self.image = cachedImage
+            return
+        }
+
+        // if image is not present in the cache then get it from the server
+        DispatchQueue.global().async { [weak self] in
+            if let data = try? Data(contentsOf: imageUrl){
+                if let image = UIImage(data: data){
+                    DispatchQueue.main.async {
+                        self!.imageCache.setObject(image, forKey: imageUrl as AnyObject)
+                        self?.image = image
+                    }
+                }
+            }
+        }
+    }
+}