fixed SettingsViewController not updating after clearing caches

[DanielStandfest]

Fixes #1791

@SystemKeeper

[SystemKeeper]

Hey, thanks again for this PR!
I actually worked on that as well in this PR #1849. But I missed the completion block for the disk cache, which is nice. So I'll remove that commit from the PR and we can go ahead with yours :)

The only thing I am wondering: Did you see any threading issues? Everything should be done on the main thread already, the completion block for example is explicitly dispatched to main already:
https://github.com/SDWebImage/SDWebImage/blob/780aa6db621b7d195c31bab4d483879c1290d278/SDWebImage/Core/SDImageCache.m#L822-L831

That's the only thing I am wondering right now (and is a bit nit-picky 😉).

[DanielStandfest]

Hi, thank you for your review, Marcel.
Funny that we worked on the same issue at (nearly) the same time.

No problem with being nit-picky, I am eager to learn!
You are right and it seems that there are no threading issues after removing the dispatchqueue-main thread block.

I removed these parts now :)

[SystemKeeper]

Cool, thanks for the PR and the changes :-)

[Ivansss]

Tested and works 👍
Thanks a lot for your PR @DanielStandfest :)

[SystemKeeper]

/backport to stable20

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