Tag: uicollectionviewstream量布局

UICollectionView自定义stream布局在滚动时崩溃

我正在创build一个自定义flowLayout部分标题。 这里是我的flowLayout.swift import UIKit class FlowLayout: UICollectionViewFlowLayout { override func layoutAttributesForElementsInRect(rect: CGRect) -> [UICollectionViewLayoutAttributes]? { // let attributesForElementsInRect = super. var newAttributesForElementsInRect = [UICollectionViewLayoutAttributes]() // unwrap super's attributes guard let attributesForElementsInRect = super.layoutAttributesForElementsInRect(rect) else { return nil } // modify attributes var leftMargin: CGFloat = 0.0; for attributes in attributesForElementsInRect { let itemAttributesCopy = attributes.copy() […]