UIButton in a custom UIView sub class not triggering action events

Question

This has been asked multiple times and I am sorry for that.But I want to get a good deep understanding why it does this. So here is the thing:

ViewController -> customView -> UIButton I am trying to access the button in view controller using delegate/protocols. But before doing all that I want to first make sure that the button triggers the selector methods.

In customView class I have two UIButtons, added targets to them:

   var photoButton: UIButton = {
    let button = UIButton(type: .system)
    button.setTitle("Photos", for: .normal)
    button.translatesAutoresizingMaskIntoConstraints = false
    button.addTarget(self, action: #selector(handleAddPhotoButton), for: .touchUpInside)
    return button
}()

Then in handlePhotoButton (still in custom class) I am saying this:

    @objc func handleAddPhotoButton() {
    print("button")
}

However, it just doesn't work. The constraints are fine. I have checked the heirarchy debugger as well, and the button is on top. In view controller the custom view is initialized like this:

    lazy var accessoryView: AccessoryView = {
    let view = AccessoryView()
    view.delegate = self
    view.translatesAutoresizingMaskIntoConstraints = false
    return view
}()

My guess is that the view is not being hold on to by self. But what is going wrong here. Please help!

Answer 1

尝试在声明按钮之前添加“懒惰”