Swift 没有 prepareForSegue 的委托

Question

我是 swift 和 ios 开发的新手。我有两个类并希望它们连接。我没有使用 prepareForSegue。这就是我的，一定是哪里出了问题。

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")
}

}

出于某种原因，timerDidFinish 没有触发。

Answer 1

根据您的解释，我了解到这两个 UIViewController 没有以任何方式链接。

当您单击按钮触发 @IBAction func timeFired(sender: UIButton){..} 函数时，您将进入 Timer UIViewController。

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

如果您只想调用 timerDidFinish() 函数而不想与 ViewController 做任何其他事情，那么请执行以下操作：

class Timer: UIViewController {

var delegate:TimeDelegate?

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

}

然后你的函数就会被调用。

Swift 没有 prepareForSegue 的委托

Swift Delegate without prepareForSegue

delegates

protocols

ios

swift