Why am I getting this warning when I add the target to my UIButton in my controller? (the warning an-CodePudding

I am programmatically creating a button and am receiving this warning for every button I create when I add the "button.addTarget" line of code to it. The code is below:

let logoutButton: UIButton = {
        let button = UIButton(type: .system)
        button.setTitle("Log Out", for: .normal)
        button.setWidth(width: 100)
        button.setHeight(height: 30)
        button.layer.cornerRadius = 15
        button.backgroundColor = .white
        button.setTitleColor(.red, for: .normal)
        button.addTarget(self, action: #selector(handleLogOut), for: .touchUpInside)
        return button
    }()

The warning I am getting for this is: 'self' refers to the method 'HomeController.self', which may be unexpected

And it also comes with a fix, which is: Use 'HomeController' to silence this warning

However, when I implement this fix, the "self" in the first parameter of the "button.addTarget" line becomes "HomeController.self" and makes the app crash.

I always used to use "self" for this and it never gave warnings until recently. Now it gives a warning for this every time. When I use "self," it all still works fine, but the warnings in Xcode are annoying... any help is appreciated.

CodePudding user response：

Use lazy var instead of let it will solve problem or set target in viewDidLoad.

CodePudding user response：

You are creating a variable and assigning the result of a closure to that variable. That closure's code executes before any instances of your class exist (Before there is a self to refer to.)

Self does not exist at the time that code runs.

As Abhishek suggests in their answer (voted) if you switch your declaration to a lazy var, lazy vars get created the first time they are referenced. self exists when a lazy var's value is computed.