ios - Swift iOS 如何删除顶部填充 UICollectionView

Question

override func viewDidLoad(){
    super.viewDidLoad()
    scrollView.collectionViewLayout = layout
    scrollView.delegate = self
    scrollView.dataSource = self
    scrollView.contentInset = .zero
    scrollView.scrollIndicatorInsets = .zero
    scrollView.isDirectionalLockEnabled = true
    scrollView.register(UINib(nibName: "RadioView", bundle: nil), forCellWithReuseIdentifier: "RadioViewController")
}
lazy var layout: UICollectionViewFlowLayout = {
    let layout = UICollectionViewFlowLayout()
    layout.minimumLineSpacing = 0
    layout.headerReferenceSize = .zero
    layout.sectionInset = .zero
    layout.scrollDirection = UICollectionViewScrollDirection.horizontal
    return layout
}()

背景颜色红色是 UICollectionView

backgorund Color Black 是 UICollectionViewCell

我想将单元格移到左上角

Answer 1

如果不是布局约束问题，那么:

collectionView.contentInset = UIEdgeInsets.zero

也有可能你已经实现了:

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
        //...
    }

在这种情况下，您需要将方法返回值 top 属性设置为 0