UICollectionView，来自注册为单元格的框架目标的 nib 在运行时失败 [英] UICollectionView, nib from a framework target registered as a cell fails at runtime

问题描述

我在 xib 中绘制了一个 UICollectionViewCell，并附有 swift 类文件.这两个文件是我应用的 UI 框架目标(称为 SomeUI)的一部分.

I have a UICollectionViewCell drawn out in a xib and accompanied by swift class file. These two files are part of my app's UI framework target (called SomeUI).

在我的集合视图的视图控制器中(在应用程序目标中)，我将笔尖注册为集合视图单元格.我的视图控制器代码如下；

In the view controller of my collection view (in the app target) I register the nib as a collection view cell. My view controller code is as follows;

import UIKit
import SomeUI

let reuseIdentifier = "Cell"

class ACollectionViewController: UICollectionViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        self.collectionView.registerNib(UINib(nibName: "JamesTheCollectionViewCell", bundle: NSBundle(identifier: "SomeUI")), forCellWithReuseIdentifier: reuseIdentifier)
    }

    override func numberOfSectionsInCollectionView(collectionView: UICollectionView!) -> Int {
        return 1
    }

    override func collectionView(collectionView: UICollectionView!, numberOfItemsInSection section: Int) -> Int {
        return 1
    }

    override func collectionView(collectionView: UICollectionView!, cellForItemAtIndexPath indexPath: NSIndexPath!) -> UICollectionViewCell! {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as JamesTheCollectionViewCell
        cell.titleLabel.text = "yippee"
        return cell
    }
}

在 nib 中，单元格视图已适当设置了其自定义类；模块 SomeUI 中的 JamesTheCollectionViewCell.

In the nib, the cell view has its custom class set appropriately; JamesTheCollectionViewCell in module SomeUI.

虽然 Xcode 似乎对这个设置很满意，但在运行时我收到一个错误，因为找不到 JamesTheCollectionView.swift 中定义的类.

While Xcode seems quite happy with this setup, at runtime i get an error as the class defined in JamesTheCollectionView.swift cannot be found.

未知类 _TtC19collectionViewThing26JamesTheCollectionViewCell 中界面生成器文件.

Unknown class _TtC19collectionViewThing26JamesTheCollectionViewCell in Interface Builder file.

如果我将 JamesTheCollectionView.swift 的目标成员资格从框架切换到应用程序(但将 xib 作为框架的一部分)，一切运行正常.但是，我要求 xib 文件从框架加载类……我错过了什么，为什么当单元实现类是框架的一部分时它不起作用?

If I switch the target membership for JamesTheCollectionView.swift from the framework to the application (but leave the xib as part of the framework), everything runs fine. But, I asked the xib file to load the class from the framework… what am i missing, why doesn't it work when the cell implementation class is part of the framework?

作为参考，这里是单元实现文件:

For reference, here is the cell implementation file:

import UIKit

public class JamesTheCollectionViewCell: UICollectionViewCell {
    @IBOutlet public weak var titleLabel: UILabel!
}

推荐答案

已解决.

TL:DR;更改文件的目标成员资格时，请记住在下次构建之前执行 Product > Clean！

TL:DR; When changing target membership for files, remember to do Product > Clean before next build!

说明:问题是SomeUI"不是有效的 UIBundle 标识符，因此 NSBundle(identifier: "SomeUI") 返回 nil，因此 registerNib 行从应用程序包而不是框架中注册了一个笔尖.应用程序包不包含单元实现类，所以它崩溃了.

Explanation: The problem was that "SomeUI" isn't a valid UIBundle identifier and so NSBundle(identifier: "SomeUI") returned nil, so the registerNib line registered a nib from the application bundle not the framework. The application bundle didn't contain the cell implementation class so it crashed.

但是……应用程序包也不应该包含笔尖?那么那里发生了什么?我一直在切换 nib 和实现文件的目标成员资格.我没有在构建之间运行Clean"，因此在应用程序目标构建文件夹中保留了笔尖的副本.

But… the application bundle shouldn't have contained the nib either? So what was going on there? I had been switching the target membership for the nib and implementation file. I had not been running 'Clean' between builds, so a copy of the nib was left in the application target build folder.

原始问题的解决方案是通过将 NSBundle(identifier: "SomeUI") 替换为 NSBundle(forClass: JamesTheCollectionViewCell.self)

The solution to original problem was to correctly load the nib from the SomeUI framework by replacing NSBundle(identifier: "SomeUI") with NSBundle(forClass: JamesTheCollectionViewCell.self)

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