ios - SnapKit 自动布局损坏 : "Unable to simultaneously satisfy constraints"

Question

UICollectionView Cell 中的两个 View 。 UIImageView 和 UIView 。像这样:layout

但是当我进行约束时，出现错误:

Unable to simultaneously satisfy constraints

    imgView.snp_makeConstraints { make in
        make.top.equalTo(contentView)//.inset(K.Space.Small)
        //make.bottom.equalTo(self.descView.snp_top)//.inset(K.Space.Small.negative())
        make.left.right.equalTo(contentView)
    }

    descView.snp_makeConstraints { make in
        make.bottom.equalTo(contentView)
        make.left.right.bottom.equalTo(contentView)
        make.height.equalTo(44)
        make.top.equalTo(imgView.snp_bottom)
    }

错误: error

为什么？

编辑:在vc viewDidLoad方法中初始化 Collection View 。 【布局.itemSize】当第一次在 ViewController 错误时。但向下滚动没有错误。

    let collectionContentInset = UIEdgeInsets(top: 0, left: 12, bottom: 0, right: 12)
    var collectionItemSize = DXLayoutSize(aspectRatio: 1.35)
    collectionItemSize.containerInset = collectionContentInset

    let layout = UICollectionViewFlowLayout()
    layout.itemSize = collectionItemSize.itemSize()
    layout.minimumInteritemSpacing = 6;
    layout.minimumLineSpacing = 0;

    collectionView = UICollectionView(frame: CGRectZero, collectionViewLayout: layout)
    collectionView!.backgroundColor = DXUIColor.Background.color()
    collectionView!.showsHorizontalScrollIndicator = false

    collectionView!.contentInset = collectionContentInset

Answer 1

查看错误消息。它表示您有一个 NSAutoResizingMaskLayoutConstraint ，它将 contentView 的高度和宽度设置为 0。只需禁用从自动调整大小蒙版创建约束即可:

contentView.translatesAutoresizingMaskIntoConstraints = false