Can a captured self becomes nil in a closure?

[Kilian]

Would it be possible that self gets deallocated in a closure and the system would crash?

e.g.

DispatchQueue.main.async {
self.backgroundColor = .red
}

[tera]

No. Here you are capturing self strongly. If you didn't capture self (by using [unowned self]in the capture list) – then it could crash.