ios - 如何在 IBAction 中运行委托(delegate)方法？

Question

我在第二个 View Controller 中有一些方法。我通过委托(delegate)访问它们 - 在 func buttonSender 内部。主要目标是将按钮的 currentTitle 作为参数传递给 viewController.addNewMessage。执行此操作的最佳方法是什么？

聊天 View Controller :

protocol ReactToButtons {
    func buttonSender(viewController: MyChatViewController)
}


class MyChatViewController: ChatViewController{

    var delegate: ReactToButtons?

    override func viewDidLoad() {
        super.viewDidLoad()
        delegate!.buttonSender(self)

    }
}

容器 View Controller :

class ContainerViewController: UIViewController, ReactToButtons {
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let myVC = segue.destinationViewController as! MyChatViewController
        myVC.delegate = self
    }

    func buttonSender(viewController: MyChatViewController) {
        viewController.addNewMessage(/*HERE GOES CURRENT TITLE*/)
    }

    @IBAction func leftButtonPressed(sender: AnyObject) {
        let currentTitle = sender.currentTitle!

    }

Answer 1

我已更改我的答案以适合您的代码

class ContainerViewController: UIViewController, ReactToButtons {
    var delegate: MyChatViewController!
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let myVC = segue.destinationViewController as! MyChatViewController
        myVC.delegate = self
    }

    func buttonSender(viewController: MyChatViewController) {
    delegate = viewController
    }

    @IBAction func leftButtonPressed(sender: AnyObject) {
        let currentTitle = sender.currentTitle!
        delegate!.addNewMessage(currentTitle)
    }
}