Using a KFImage multiple times results in just one being loaded (until cached)

[solidcell]

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Issue Description

What

If an image is not already cached, and a View tries to use it multiple times, only one of those usages will show the image once it loads. You need to navigate to the page again (now that the image is cached) to have it actually show all of them.

Reproduce

struct SwiftUIView: View {

    let image = KFImage(URL(string: "https://github.com/onevcat/Kingfisher/blob/master/images/kingfisher-1.jpg?raw=true")!)

    var body: some View {
        VStack {
            image
            image
        }
    }
}

[onevcat]

Ummm. I guess it is another issue related to the ObservedObject limitation mentioned in #1660

Some fixes were already applied on the master branch, but it requires iOS 14 or above. If you do not need to support iOS 13 anymore, maybe it would be a good chance to try and check if the master branch can solve this issue for now.

A major upgrade is in plan now with those fixes and we are going to release some beta version soon.