在Swift 3中更改屏幕视图

Question

我最近开始学习Swift，需要帮助。该程序之前运行正常，但我不知道我做了什么，现在它不起作用，按钮不出现，它在一个屏幕上崩溃。错误说＆＃34;由于未捕获的异常终止应用程序＆＃39; NSUnknownKeyExeption＆＃39;，原因：[setValue：forUndefinedKey：]：此类不是密钥nextButton编码兼容的键值。＆＃39;我有一个按钮，你点击进入下一个屏幕，但我点击它，它崩溃了。下面是HomeViewController，SecondScreenViewController和ThirdScreenViewController上的代码。

HomeViewController

@IBAction func notifiyButtonPressed(_ sender: AnyObject) {

    print("Pressed")
    self.performSegue(withIdentifier: "ViewSegue", sender: self)
}
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    print("View has loaded! ")

}

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

SecondScreenViewController：

  @IBOutlet var textField: UITextField!


@IBAction func nextButtonPressed(_ sender: Any) {

    self.performSegue(withIdentifier: "whotoclass", sender: self)
}

override func viewDidLoad() {
    super.viewDidLoad()

    self.textField.delegate = self
    print("View 2 Loaded")

    // Do any additional setup after loading the view, typically from a nib.
}

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


//Hide Keyboard when user touches outside keybaord
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    self.view.endEditing(true)
}

//Presses return key
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
    textField.resignFirstResponder()
    return(true)
}

ThirdScreenViewController：

import UIKit

class ThirdScreenViewController：UIViewController {

@IBOutlet var joshClassButton: UIButton!
@IBAction func joshClassButton(_ sender: Any) {

    self.performSegue(withIdentifier: "classtoperiod", sender: self)

}

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

}

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

还附上了我的Main.storyboard的图片。如果有人能在这里提供帮助，那将是一个巨大的帮助，因为现在至少工作2个小时的问题。谢谢大家！

http://i.imgur.com/QCuJojA.png

Answer 1

尝试使用Swift 3

public func settingAction(_sender: UIButton) {
    let settingStoryboard : UIStoryboard = UIStoryboard(name: "SettingViewController", bundle: nil)
    let settingVC = settingStoryboard.instantiateViewController(withIdentifier: "SettingViewController") as! SettingViewController
    self.present(settingVC, animated: true, completion: {

    })
}