Can you explain what it means to use a weak reference to self in closures?

Using a weak reference to self in closures in iOS (Swift) helps avoid retain cycles, which can lead to memory leaks. When a closure captures self as a strong reference, and self holds that closure, they keep each other alive, preventing memory from being released.

Example:

class MyClass {
    var closure: (() -> Void)?

    func setup() {
        closure = { [weak self] in
            guard let self = self else { return }
            self.doSomething()
        }
    }

    func doSomething() {
        print("Action")
    }
}

Here, [weak self] means that within the closure, self will be a weak reference, and if the object is destroyed, the reference will become nil, preventing a memory leak.