Question

我是新手，现在我正在学习代表。我想我已经做了正确的事，但它仍然没有用。

我正在做的是将数据从ViewController传递到TestViewController

的ViewController：

protocol viewControllerDelegate: class {
  func viewcontrollerdelegate(setviewcontrollerdelegate: ViewController)
}

class ViewController: UIViewController ,UITextFieldDelegate {
  weak var delegate: viewControllerDelegate?

  @IBAction func nextViewandDelegate(sender: AnyObject) {
    self.delegate?.viewcontrollerdelegate(self)
  }

  override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showTestSegue" {
      if let testViewController = segue.destinationViewController as? TestViewController {
        testViewController.address = address.text!
        testViewController.phone = phone.text!
      }
    }
  }
}

TestViewController：

class TestViewController: UIViewController {

  var name: String?
  var address: String?
  var phone: String?
  var trydelegate: String?

  override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let VC = storyboard.instantiateViewControllerWithIdentifier("viewcontroller") as! ViewController
    VC.delegate = self
  }

  override func viewWillAppear(animated: Bool) {
    addressLabel.text = address!
    phoneLabel.text = phone!
    trydelegateLabel.text = trydelegate //always nil here
  }
}

extension TestViewController:viewControllerDelegate {
  func viewcontrollerdelegate(setviewcontrollerdelegate: ViewController) {
    self.trydelegate = setviewcontrollerdelegate.address.text!
  }
}

我使用segue传递地址和电话，但效果很好。

但我对代表感到厌烦。任何人都可以帮我一点点吗？我知道这个问题对你来说有点容易。

非常感谢。

Answer 1

在TestViewController中的viewDidLoad中，您创建的新对象vc与调用prepareForSegue的对象不同，这就是为什么它没有＆＃39}工作。

要解决此问题，请从viewDidLoad删除代码：

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewControllerWithIdentifier("viewcontroller") as! ViewController
vc.delegate = self

在prepareForSegue添加一行：

testViewController.phone = phone.text!
// New line
self.delegate = testViewController

这应该有所帮助。

Answer 2

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showTestSegue" {
        if let testViewController = segue.destinationViewController as? TestViewController {

            testViewController.address = address.text!
            testViewController.phone = phone.text!
            self.delegate = testViewController
            self.delegate?.viewcontrollerdelegate(self)
        }
    }
}

删除@IBAction func nextViewandDelegate（sender：AnyObject）并更改该prepareforsegue

我修好了......它现在正在工作，但我不知道为什么

我的代表有什么不对？

2 个答案: