image publisher with images

Author: BigAppleMax

Sources/iOSIntPackage/ImagePublisher/ImagePublisher.swift

@@ -0,0 +1,55 @@
+//
+// ImagePublisher.swift
+// 
+// 
+// Created by Maxim Abakumov on 2021. 06. 01.
+//
+// Copyright © 2020, Maxim Abakumov. MIT License.
+//
+
+import UIKit
+
+public protocol ImageLibrarySubscriber {
+    
+    func receive(images: [UIImage])
+}
+
+final class ImagePublisher {
+    
+    private var subscribers: [ImageLibrarySubscriber] = []
+    private var images: [UIImage] = []
+    
+    func add(image: UIImage) {
+        images.append(image)
+        notifySubscribers()
+    }
+    
+    func remove(image: UIImage) {
+        guard let index = images.firstIndex(where: { $0 == image }) else { return }
+        images.remove(at: index)
+        notifySubscribers()
+    }
+    
+    func removeAll() {
+        if !images.isEmpty {
+            images = []
+        }
+        notifySubscribers()
+    }
+    
+    func add(subscriber: ImageLibrarySubscriber) {
+        subscribers.append(subscriber)
+    }
+    
+    func remove(subscriber filter: (ImageLibrarySubscriber) -> Bool) {
+        guard let index = subscribers.firstIndex(where: filter) else { return }
+        subscribers.remove(at: index)
+    }
+    
+    private func notifySubscribers() {
+        subscribers.forEach {
+            $0.receive(images: images)
+        }
+    }
+}
+

Sources/iOSIntPackage/ImagePublisher/ImagePublisherFacade.swift

@@ -0,0 +1,67 @@
+//
+// File.swift
+// 
+// 
+// Created by Maxim Abakumov on 2021. 06. 01.
+//
+// Copyright © 2020, Maxim Abakumov. MIT License.
+//
+
+import UIKit
+
+final public class ImagePublisherFacade {
+    
+    public typealias RepeatCount = Int
+    
+    private let publisher = ImagePublisher()
+    
+    // добавляет подписчика
+    
+    public func subscribe(_ subscriber: ImageLibrarySubscriber) {
+        publisher.add(subscriber: subscriber)
+    }
+    
+    // удаляет подписчика
+    
+    public func removeSubscription(for subscriber: ImageLibrarySubscriber) {
+        publisher.remove { _ in
+            return true
+        }
+    }
+    
+    /// По таймеру добавляет новые случайные UIImage в библиотеку ImagePublisher
+    /// Поскольку изображений в библиотеке немного, можно добавлять свои картинки
+    
+    @available(iOS 10.0, *)
+    public func addImagesWithTimer(
+        time interval: TimeInterval,
+        repeat times: RepeatCount,
+        userImage: UIImage? = nil
+    ) {
+        var count = 0
+        Timer.scheduledTimer(
+            withTimeInterval: interval,
+            repeats: true
+        ) { [weak self] timer in
+            count += 1
+            
+            if let image = userImage {
+                self?.publisher.add(image: image)
+            } else {
+                guard let imageCase = Images.allCases.randomElement() else { return }
+                let libraryImage = imageCase.image(name: imageCase)
+                self?.publisher.add(image: libraryImage)
+            }
+            
+            if count == times {
+                timer.invalidate()
+            }
+        }
+    }
+    
+    // метод обнуляет библиотеку изображений
+    
+    public func rechargeImageLibrary() {
+        publisher.removeAll()
+    }
+}

Sources/iOSIntPackage/Images.swift

@@ -9,21 +9,22 @@
 
 import UIKit
 
-public struct Images {
+public enum Images: String, CaseIterable {
 
-    public static var checkmark: UIImage {
-        return getPdfImage(by: "checkmark")
-    }
-    
-    public static var sunset: UIImage {
-        return getPdfImage(by: "sunset")
-    }
+    case checkmark
+    case sunset
+    case mountain
+    case annecy
+    case annecy2
+    case skyscraper
+    case avatar
+    case cafe
 
-    public static var mountain: UIImage {
-        return getPdfImage(by: "mountain")
+    public func image(name: Images) -> UIImage {
+        return getPdfImage(by: name.rawValue)
     }
 
-    private static func getPdfImage(by name: String) -> UIImage {
+    private func getPdfImage(by name: String) -> UIImage {
 
         guard let image = UIImage(
                 named: name,

Sources/iOSIntPackage/Media.xcassets/annecy.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "filename" : "annecy.pdf",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Sources/iOSIntPackage/Media.xcassets/annecy.imageset/annecy.pdf

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "filename" : "annecy2.pdf",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Sources/iOSIntPackage/Media.xcassets/annecy2.imageset/Contents.json

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "filename" : "avatarrr.pdf",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

Sources/iOSIntPackage/Media.xcassets/annecy2.imageset/annecy2.pdf

@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "filename" : "cafe.pdf",
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}