Question

我为UICollectionView创建了自定义类。我想将另一个“集合”视图放入第一类的单元格中。

import UIKit

class ModeCell: UICollectionViewCell {

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


    let modeCollection : UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        let collectionView = UICollectionView(frame: .zero, collectionViewLayout: layout)
        collectionView.backgroundColor = .cyan
        collectionView.translatesAutoresizingMaskIntoConstraints = false
        return collectionView
    }()

    func setupView(){
        backgroundColor = .red

        addSubview(modeCollection)
                addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:[v0(180)]-20-|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": modeCollection]))

                addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-25-[v0(180)]", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": modeCollection]))

                addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|-30-[v0(160)]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": modeCollection]))

                addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|-95-[v0]", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": modeCollection]))

    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

此代码可以正常工作，但是我想知道是否有可能在我在其他项目中使用约束时使用约束：

modeCollection.centerXAnchor.constraint（equalTo：.centerXAnchor）.isActive = true modeCollection.bottomAnchor.constraint（equalTo：view.bottomAnchor）.isActive = true modeCollection.widthAnchor.constraint（equalTo：view.widthAnchor）.isActive = true modeCollection.heightAnchor.constraint（equalToConstant：49）.isActive = true

问题是我的新自定义类中没有“视图”，并且我没有什么可引用的...

Answer 1

您没有为<body>创建约束，而是为view本身（在您的情况下为self）上创建约束UICollectionViewCell。

另一个collectionview内的collection view单元格的约束

1 个答案: