Pass parameters to button action in swift-CodePudding

When setting the action with the "addTarget" method on a button in Swift, is there a way for me to pass a parameter to the function I want to trigger? Say I had a simple scenario like this:

let button = UIButton()
button.addTarget(self, action: #selector(didPressButton), for: .touchUpInside)

@objc func didPressButton() {
    // do something
}

Obviously the above code works fine, but say I wanted the 'didPressButton' function to take in a parameter:

@objc func didPressButton(myParam: String) {
    // do something with myParam
}

Is there a way I can pass a parameter into the function in the 'addTarget' method? Something like this:

let button = UIButton()
button.addTarget(self, action: #selector(didPressButton(myParam: "Test")), for: .touchUpInside)

@objc func didPressButton(myParam: String) {
    // do something with myParam
}

I'm coming from a JavaScript background and in JavaScript it's pretty simple to achieve this behavior by simply passing an anonymous function that would then call the 'didPressButton' function. However, I can't quite figure how to achieve this with swift. Can a similar technique be used by using a closure? Or does the '#selector' keyword prevent me from doing something like that?

Thank you to anyone who can help!

CodePudding user response：

The short answer is no.

The target selector mechanism only sends the target in the parameters. If the string was a part of a subclass of UIbutton then you could grab it from there.

class SomeButton: UIButton {
  var someString: String

}

@objc func didPressButton(_ button: SomeButton) {
  // use button.someString
}

CodePudding user response：

It is not possible to do that in iOS. You can get the View in the selector in your case it is a button.

button.addTarget(self, action: #selector(buttonClick(_:)), for: .touchUpInside)

@objc func buttonClick(_ view: UIButton) {
    switch view.titleLabel?.text {
    case "Button":
        break
    default:
        break
    }
}