Minor improvements.

Author: bullinnyc

README.md

@@ -106,6 +106,16 @@ init() {
 }
 ```
 
+### You can also read this value from within a view to access the image cache management
+
+```swift
+struct MyView: View {
+    @ImageCache private var imageCache
+
+    // ...
+}
+```
+
 ## Requirements
 - iOS 14.0 +
 - [SwiftUI](https://developer.apple.com/xcode/swiftui/)

Sources/CachedAsyncImage/PropertyWrappers/ImageCache.swift

@@ -8,18 +8,29 @@
 
 import Foundation
 
+/// A property wrapper type that reflects a value from `TemporaryImageCache`.
+///
+/// Read this value from within a view to access the image cache management.
+///
+///     struct MyView: View {
+///         @ImageCache private var imageCache
+///
+///         // ...
+///     }
+///
 @propertyWrapper
 public struct ImageCache {
     // MARK: - Public Properties
 
+    /// The wrapped value property provides primary access to the value’s data.
     public var wrappedValue: ImageCacheProtocol {
         get { storage.imageCache }
         nonmutating set { storage.imageCache = newValue }
     }
 
     // MARK: - Private Properties
 
-    private var storage: FeatureStorage
+    private let storage: FeatureStorage
 
     // MARK: - Initializers
 

Sources/CachedAsyncImage/PropertyWrappers/Network.swift

@@ -19,7 +19,7 @@ struct Network {
 
     // MARK: - Private Properties
 
-    private var storage: FeatureStorage
+    private let storage: FeatureStorage
 
     // MARK: - Initializers
 

Sources/CachedAsyncImage/Services/ImageLoader.swift

@@ -67,9 +67,7 @@ final class ImageLoader: ObservableObject {
             .map { CPImage(data: $0) }
             .catch { [weak self] error -> AnyPublisher<CPImage?, Never> in
                 if let error = error as? NetworkError {
-                    DispatchQueue.main.async {
-                        self?.errorMessage = error.rawValue
-                    }
+                    self?.errorMessage(with: error.rawValue)
 
                     #if DEBUG
                     print("**** CachedAsyncImage error: \(error.rawValue)")
@@ -104,22 +102,25 @@ final class ImageLoader: ObservableObject {
 
     private func start() {
         isLoading = true
-        
-        Task { @MainActor [weak self] in
-            self?.errorMessage = nil
-        }
+        errorMessage(with: nil)
     }
 
     private func finish() {
         isLoading = false
     }
 
+    private func cancel() {
+        cancellables.forEach { $0.cancel() }
+    }
+    
     private func cache(url: URL?, image: CPImage?) {
         guard let url = url else { return }
         image.map { imageCache[url] = $0 }
     }
 
-    private func cancel() {
-        cancellables.forEach { $0.cancel() }
+    private func errorMessage(with text: String?) {
+        Task { @MainActor [weak self] in
+            self?.errorMessage = text
+        }
     }
 }

Sources/CachedAsyncImage/Services/TemporaryImageCache.swift

@@ -28,7 +28,6 @@ public protocol ImageCacheProtocol {
     func removeCache()
 }
 
-/// Temporary image cache.
 struct TemporaryImageCache: ImageCacheProtocol {
     // MARK: - Private Properties
 
@@ -39,7 +38,7 @@ struct TemporaryImageCache: ImageCacheProtocol {
 
     // MARK: - Subscripts
 
-    public subscript(_ key: URL) -> CPImage? {
+    subscript(_ key: URL) -> CPImage? {
         get { cache.object(forKey: key as NSURL) }
         set {
             newValue == nil
@@ -50,12 +49,12 @@ struct TemporaryImageCache: ImageCacheProtocol {
 
     // MARK: - Public Methods
 
-    public func setCacheLimit(countLimit: Int = 0, totalCostLimit: Int = 0) {
+    func setCacheLimit(countLimit: Int = 0, totalCostLimit: Int = 0) {
         cache.countLimit = countLimit
         cache.totalCostLimit = totalCostLimit
     }
 
-    public func removeCache() {
+    func removeCache() {
         cache.removeAllObjects()
     }
 }