致命错误：在课堂上使用未实现的初始化程序'init（coder :)' [英] Fatal error: use of unimplemented initializer 'init(coder:)' for class

问题描述

我决定用Swift语言继续我的剩余项目。当我在storyboard viewcontroller中添加自定义类（.swift类，哪个子类到UIViewcontroller）并加载项目时，应用程序突然崩溃，后面有错误：

I decided to continue my remaining project with Swift-language.When I added the custom class (.swift class which sub class to UIViewcontroller) in my storyboard viewcontroller and loaded the project the app crash suddenly with following error:

致命错误：使用未实现的初始化程序'init（coder :)'用于类

fatal error: use of unimplemented initializer 'init(coder:)' for class

这是一段代码：

import UIKit

class TestViewController: UIViewController {

    init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) {
        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        // Custom initialization
    }

    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.
    }

    /*
    // #pragma mark - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue?, sender: AnyObject?) {
        // Get the new view controller using [segue destinationViewController].
        // Pass the selected object to the new view controller.
    }
    */
}

请提出建议，

推荐答案

问题

这是由于缺少初始化程序<目标 UIViewController 上的code> init？（编码器aDecoder：NSCoder）。该方法是必需的，因为从 UIStoryboard 实例化 UIViewController 会调用它。

Issue

This is caused by the absence of the initializer init?(coder aDecoder: NSCoder) on the target UIViewController. That method is required because instantiating a UIViewController from a UIStoryboard calls it.

要了解我们如何从 UIStoryboard UIViewController >，请看一下这里

To see how we initialize a UIViewController from a UIStoryboard, please take a look here

因为 Objective-C 会自动继承所有必需的 UIViewController 初始化器。

Because Objective-C automatically inherits all the required UIViewController initializers.

Swift 默认情况下不会因安全而继承初始值设定项。但是如果所有属性都有值（或可选）并且子类没有定义任何指定的初始化器，它将继承超类中的所有初始化器。

Swift by default does not inherit the initializers due to safety. But it will inherit all the initializers from the superclass if all the properties have a value (or optional) and the subclass has not defined any designated initializers.

在目标 UIViewController上手动实现 init？（编码器aDecoder：NSCoder）

Manually implementing init?(coder aDecoder: NSCoder) on the target UIViewController

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

---

2。第二种方法

在你的目标上删除 init（nibName nibNameOrNil：String ?, bundle nibBundleOrNil：NSBundle？） c $ c> UIViewController 将继承超类中所有必需的初始值设定项， Dave Wood 指向答案

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2. Second method

Removing init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: NSBundle?) on your target UIViewController will inherit all of the required initializers from the superclass as Dave Wood pointed on his answer below

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