不带prepareForSegue的Swift代表

Question

我是新来的swift，正在ios发展。我有两个课程，希望他们能够联系。我没有使用prepareForSegue。这就是我所拥有的，某处一定有问题。

protocol TimeDelegate{
 func timerDidFinish()
}


class Timer: UIViewController {

// this is where we declare our protocol
var delegate:TimeDelegate?

override func viewDidLoad() {
    super.viewDidLoad()

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func timeFired(sender: UIButton){

    delegate?.timerDidFinish()

}

}


import UIKit


class ViewController: UIViewController, TimeDelegate {

var timer:Timer = Timer()

override func viewDidLoad() {
    super.viewDidLoad()

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func timerDidFinish(){

    println("Delegate is working")
}

}

由于某些原因，timerDidFinish没有触发。

Answer 1

从您的解释中，我得知两个UIViewControllers没有以任何方式链接。

当您单击按钮以触发@IBAction func timeFired(sender: UIButton){..}功能时，您将在TimerUIViewController中。

那你ViewController什么时候实例化？如果不实例化它，则将永远不会设置委托。

如果您只想调用timerDidFinish()func，并且不希望与之无关，请ViewController执行以下操作：

class Timer: UIViewController {

var delegate:TimeDelegate?

override func viewDidLoad() {
super.viewDidLoad()
var vc = ViewController()
self.delegate = vc

}

然后将调用您的函数。