Kingfisher: Self is immutable inside class extension

[robin-nyman-mi]

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Issue Description

What

After upgrading from 4.x to 5.x, it's no longer possible to set the 'indicatorType' inside of a class extension.

Cannot assign to property: 'self' is immutable

Reproduce

Create a UIImageView extension and try to set the indicatorType inside a function.

extension UIImageView {
  func doSomething() {
    self.kf.indicatorType = .activity // Error
  }
}

Other Comment

It's still possible to call functions such as 'setImage'.

[onevcat]

Yes, now the kf returns a struct instead of class. This change is for performance, and for your case, try:

extension UIImageView {
    func doSomething() {
        var kf = self.kf
        kf.indicatorType = .activity
    }
}

[robin-nyman-mi]

Yes, this fixes the compilation error.
I was worried that the changes would not be reflected, but it seems to work.

Thanks for the help.