Question

我是swift和ios开发的新手。我有两个课程，希望他们连接。我没有使用prepareForSegue。这就是我所拥有的，某些地方肯定是错的。

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")
}

}

出于某种原因， timerDidFinish 未触发。

Answer 1

根据你的解释，我认为两个UIViewControllers没有任何联系。

当您单击按钮以激活@IBAction func timeFired(sender: UIButton){..}功能时，您将进入Timer UIViewController。

然后你什么时候实例化ViewController？在没有实例化的情况下，委托将永远不会被设置。

如果您只是想调用timerDidFinish() func并且不想与ViewController做任何其他事情，请执行以下操作：

class Timer: UIViewController {

var delegate:TimeDelegate?

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

}

然后你的函数将被调用。

没有prepareForSegue的Swift代表

1 个答案: