在UIBarItem点击时未调用委派

Question

委派方法不调用点击UIBarItem。我经历了这么多的建议，都是我写的一样的。

我根据建议尝试了，没有解决方案。在给定的任何地方调用委托。我做了每一件事。

class ViewController: CommonClass,Mydelegate {

    var vc = CommonClass()

    override func viewDidLoad() {
        super.viewDidLoad()
        vc = CommonClass(nibName: "CommonClass", bundle: nil)
        initializeCartBarButton()
        vc.delegate = self
        print( (vc.delegate))
    }

    func testing() {
        print("hello")
    }
}

class CommonClass: UIViewController {

    var delegate:Mydelegate?

    func initializeCartBarButton() {
        let cartBarButton = UIBarButtonItem()
        cartBarButton.title = "cart"
        cartBarButton.target = self
        cartBarButton.action = Selector("goToCart")
        self.navigationItem.rightBarButtonItem = cartBarButton;

    }

    func goToCart() {
        print("hi")
        if self.delegate?.testing() != nil {
            self.delegate?.testing()

        }else {
            print(self.delegate)
        }
    }
}

Answer 1

我看到的是：

1. CommonClass继承UIViewController.
2. ViewController继承CommonClass.
3. Means视图控制器可以直接调用ViewController.

中的CommonClass方法。

• 您可以直接从View中调用goToCart()方法

因此，不需要使用委托模式来调用CommonClass的方法。

Answer 2

演示使用自定义委托的示例示例：

ViewController.swift

import UIKit


protocol Mydelegate
{
    func testing()
}

class ViewController: UIViewController {


    var delegate:Mydelegate?

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        goToCart()
    }

    func goToCart() {
        print("hi")
        if delegate?.testing() != nil {
            delegate?.testing()

        }else {
            print(delegate)
        }
    }
}

ViewController2.swift

import UIKit

class ViewController2: UIViewController, Mydelegate {


    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

    }

    func testing() {
        print("hello")
    }

    @IBAction func goButtonAction(sender: AnyObject) {

        let vc: ViewController = storyboard?.instantiateViewControllerWithIdentifier("viewC") as! ViewController
        vc.delegate = self
        print( (vc.delegate))
        self.navigationController?.pushViewController(vc, animated: true)
    }
}

​

​

ViewController的StoryBoardId是"viewC“