当我尝试实例化UINib时，我得到：这个类不是键视图的键值编码兼容 [英] When I try to instantiate a UINib I get: this class is not key value coding-compliant for the key view

问题描述

关注此问题。

我有一个应用程序，主视图有一个按钮，文件'popup.xib'现在是空的（只是一个视图，没有按钮，没有标签，没有）。当我按下按钮时，我希望它弹出。出于某种原因，每当我按下按钮时都会出现以下错误：

I have an app, where the main view has one button, and a file 'popup.xib' which is now empty (Just a view, no buttons, no labels, nothing). And I want it to popup when I press the button. For some reason I get the following error whenever I press the button:

...此类不符合键值编码关键视图。'

... this class is not key value coding-compliant for the key view.'

我读过这是因为NIB的出口已被删除或更改，这就是我删除的原因所有对象以及显示空视图的内容。但我仍然会收到此错误。

I have read that this is because of outlets from the NIB which have been deleted or changed, that's why I removed all objects and what to display an empty view. But I still get this error.

我的代码：

ViewController.swift

ViewController.swift

import UIKit

class ViewController: UIViewController {

    @IBAction func showPopup(sender: AnyObject) {
        var x = UINib(nibName: "Popup", bundle: nil);
        println(x)
        var y = x.instantiateWithOwner(nil, options: nil)

        println(y)

        var z = y[0] as? PopupViewController

        println(z)
        z!.show(self.view)
    }


}

PopupViewController.swift

PopupViewController.swift

import UIKit


class PopupViewController : UIViewController {

    func show(tView : UIView) {
        tView.addSubview(self.view)
        self.view.backgroundColor = UIColor.redColor()
    }

}

输出：

<UINib: 0x7ff822412f90>
2015-02-02 15:47:57.870 tttt[5437:179808] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSObject 0x7ff822553ec0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key view.'
*** First throw call stack:

---

更新

---

Update

我根据答案和评论继续调整内容，如果我做了 var y = x.instantiateWithOwner（PopupViewController（），options：nil）行执行OK。但后来我得到一个包含UIView的数组，而不是UIViewController。因此，最后一行 z！.show（self.view）会导致崩溃。我知道它会创建正确的笔尖，导致我更改的属性（例如alpha值）出现在 println（y）的文本输出中。

I continued tweaking stuff according to the answers and comments, and got if I do var y = x.instantiateWithOwner(PopupViewController(), options: nil) the line get executed OK. But then I get back an array containing a UIView, not a UIViewController. Therefore the last line z!.show(self.view) causes a crash. I know it creates the right nib, cause the properties (e.g. alpha value) that I changed appear in the text output from println(y) correctly.

所以现在我的问题是：我应该将什么作为所有者传递到 instantiateWithOwner ？

So my question now is: What should I pass as the owner into instantiateWithOwner?

推荐答案

也许在StoryBoard XIB和swift课程之间存在一些混乱（对不起我不是我的iMac，我不能说你给我发一个项目的拉链）
我会在这里写下我通常遵循的步骤来完成这些事情，希望这可以提供帮助：

Maybe there are some messing in connections between StoryBoard XIB and swift classes (sorry I'm not with my iMac and I can't say you to send me a zip of the project) I'll write here steps I usually follow to accomplish such things, hoping this can help:

• 创建Xib文件你的项目。一如既往地将物品放在上面。 （例如： MyViewController.xib ）


• 创建一个新的Swift类（名称通常与Xib相同）（例如： MyViewController.swift ）


• 在Interface Builder中，选择xib，选择UIViewController并选择View> Utilities> Show Identity Inspector。


• 在类字段中选择自定义swift类（ MyViewController.swift ）


• Connect IBOutlets和IBActions如果您需要



• 在 MyViewController.swift 添加此扩展程序：

• Create Xib file in your project. Place items on it as always. (ex: MyViewController.xib)
• Create a new Swift class (name usually is the same as the Xib) (ex: MyViewController.swift)
• In Interface Builder, select the xib, select the UIViewController and choose View > Utilities > Show Identity Inspector.
• In the "Class" field select your custom swift class (MyViewController.swift)
• Connect IBOutlets and IBActions if you need to

• In MyViewController.swift add this extension:

extension UIViewController {
class func loadFromNibNamed(nibNamed: String, bundle : NSBundle? = nil) -> UIViewController? {
    return UINib(
        nibName: nibNamed,
        bundle: bundle
        ).instantiateWithOwner(nil, options: nil)[0] as? UIViewController
    }
}

在你的MainController中添加这一行你需要它（在按钮点击或其他地方）

In your MainController add this line wherever you need it (in button click or other places)

var x = MyViewController.loadFromNibNamed("MyViewController") as MyViewController

X现在是MyViewController的实例，Xib文件是已加载。

X now is instance of your MyViewController and Xib files is already loaded.

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