当向数据源添加值时,ibdesignable with collectionview崩溃

所以设置肯定是相关的。显然ib在为你的uicollectionview加载单元格时崩溃了。它无法加载nib文件。它与追加没有任何关系,只是同时崩溃了。我复制了你的问题,然后用代码创建了一个单元格,一切正常。如果这有帮助,请告诉我,并回答您的问题。所有必需的代码都在那里。

import UIKit

struct HashTag {
    var word:String?
}

class HashCollectionViewCell: UICollectionViewCell {

    lazy var wordLabel : UILabel = {
        let lbl = UILabel(frame: self.bounds)
        lbl.font = UIFont.systemFont(ofSize: 17)
        lbl.textColor = .black
        return lbl
    }()

    override init(frame: CGRect) {
        super.init(frame: frame)
        self.addSubview(wordLabel)
    }

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

    func configureWithTag(tag:HashTag) {
        wordLabel.text = tag.word
    }

}

@IBDesignable
class HashTagView: UIView {

    private var sizingLabel = UILabel(frame: .zero)
   lazy var collectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        let view = UICollectionView(frame: self.bounds, collectionViewLayout: layout)
        view.autoresizingMask = [.flexibleWidth,.flexibleHeight]
        return view
    }()

    var hashtags: [HashTag] = [HashTag(word: "this works")]

    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }

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


    func setup(){
        sizingLabel.font = UIFont.systemFont(ofSize: 17)

        self.addSubview(collectionView)
        collectionView.frame = self.bounds
        collectionView.backgroundColor = self.backgroundColor
        collectionView.register(HashCollectionViewCell.self, forCellWithReuseIdentifier: "hashCell")
        self.addSubview(collectionView)

        for x in 0..<10{
            addHashTag(tag: "This is more \(x)")
        }

        collectionView.delegate = self
        collectionView.dataSource = self
    }

    func addHashTag(tag:String){
        let newHash = HashTag(word: tag)
        self.hashtags.append(newHash)
    }

    override func layoutSubviews() {
        super.layoutSubviews()
        collectionView.frame = self.bounds
    }

}

extension HashTagView: UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout{
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return hashtags.count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "hashCell", for: indexPath) as? HashCollectionViewCell{
            let tag = self.hashtags[indexPath.item]
            cell.configureWithTag(tag: tag)
            return cell
        }
        return UICollectionViewCell()
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let tag = self.hashtags[indexPath.item]
        sizingLabel.text = tag.word
        sizingLabel.sizeToFit()
        return sizingLabel.frame.size
    }
}

结果:

2)您可以将nib加载到以编程方式创建的单元中,它将工作。 对于编程单元这一部分,一个示例将如下所示。

使用单元内部NIB扩展视图的单元代码:

extension UIView {
    func loadNib() -> UIView {
        let bundle = Bundle(for: type(of: self))
        let nibName = type(of: self).description().components(separatedBy: ".").last!
        let nib = UINib(nibName: nibName, bundle: bundle)
        return nib.instantiate(withOwner: self, options: nil).first as! UIView
    }
}

class HashCollectionViewCell: UICollectionViewCell {

    var hashTagNib : HashTagNibView?

    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }

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

    func setup(){
        if let htn = HashTagNibView().loadNib() as? HashTagNibView{
            hashTagNib = htn
            hashTagNib?.frame = self.bounds
            hashTagNib?.autoresizingMask = [.flexibleWidth,.flexibleHeight]
           self.addSubview(htn)
        }

    }

    func configureWithTag(tag:HashTag) {
        if let htn = hashTagNib{
            htn.hashTagButtonLabel.setTitle(tag.word, for: .normal)
        }
    }

NIB设置如下:

这可能会给你更多的灵活性,这取决于你在做什么,结果是相似的,除了在nib的例子中,我使用了一个uibutton。