URLImage reloads whenever the view is refreshed even if URL stays the same

[TomShen1234]

Summary and/or background
When the view is refreshed (for example, via a state change), the image is always reloaded. This can be seen in the following code:

import SwiftUI
import URLImage

struct ContentView: View {
    private let url = URL(string: "URL to image")!
    
    @State private var text = ""
    @State private var saved = ""
    
    var body: some View {
        VStack {
            TextField("Enter some Text", text: $text, onCommit: { saved = text })
                .textFieldStyle(.roundedBorder)
            
            Text("The text is: \(saved)")
            
            URLImage(url) { image in
                image.resizable()
            }
        }
        .padding()
    }
}

The URLImage will reload once the saved property is changed (aka when you press the return key on the text field).

OS and what device you are using
iOS 14 and iOS 15 beta 6

Version of URLImage library
3.1.0

What you expected would happen
The image should stays without reloading.

What actually happens
See above

Sample code
See above

Test data
Any image works

Additional information

• Screenshots or video demonstrating a bug;
• Crash log;

Misc

• I read the documentation and it didn't help;
• I searched for similar issues.

[dmytro-anokhin]

Hello,

thank you for the sample code.

When the view updates, the image reloads because accessing URLCache is asynchronous operation. The way to "fix" this is to use provided in-memory cache.

import SwiftUI
import URLImage
import URLImageStore

@main
struct URLImage_Issue159App: App {
    var body: some Scene {
        let urlImageService = URLImageService(fileStore: nil, inMemoryStore: URLImageInMemoryStore())

        return WindowGroup {
            ContentView()
                .environment(\.urlImageService, urlImageService)
        }
    }
}

I will review implementation to see if there is some new tool in SwiftUI that can help with this particular case.