How do you detect and fix memory leaks in your applications?

To detect memory leaks in iOS applications, I usually use Xcode tools such as Instruments with the Leaks and Allocations profiles.

1. I run the application through Instruments and observe if leaks appear in real-time.
2. I analyze objects that are not released and their retain cycles.
3. Leaks often occur due to strong cyclic references, for example, between objects or closures, so I check the use of weak and unowned references.

An example of resolving a retain cycle in a closure:

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

    func setup() {
        closure = { [weak self] in
            self?.doSomething()
        }
    }

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

Using [weak self] here prevents a strong retain cycle between the object and the closure.

It is also helpful to use Xcode's static analyzer (Product -> Analyze) to identify potential memory issues.