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[基本解决]swift中动态计算UICollectionView的高度

Swift crifan 178浏览 0评论

swift UICollectionViewFlowLayout dynamic height

swift UICollectionView dynamic height

honghaoz/Dynamic-Collection-View-Cell-With-Auto-Layout-Demo · GitHub

layout – CollectionView Dynamic cell height swift – Stack Overflow

ios – UICollectionView – dynamic cell height? – Stack Overflow

swift UICollectionView dynamic frame height

How to expand UICollectionView frame size dynamically in swift by McDonal_11 – ScriptScoop

Ray Wenderlich | Tutorials for Developers and Gamers

ios – How to manually change UICollectionView height in Swift – Stack Overflow

最后没有实现更智能的计算,只能手动去计算了:

let SizeConversationHeader_1:CGFloat = 41
let SizeConversationHeader_234:CGFloat = 21
let SizeConversationHeader_56789:CGFloat = 13
let SizeConversationTableViewCellImage:CGFloat = SizeConversationHeader_1
    //collection view
    let collectionView:UICollectionView
    let collectionViewCellPaddingY:CGFloat = 8
    let collectionViewCellNameLabelHeight:CGFloat = 16
    let flowLayout:UICollectionViewFlowLayout
    init(curContactItem:ContactItem) {
        self.flowLayout = UICollectionViewFlowLayout()
        self.flowLayout.scrollDirection = UICollectionViewScrollDirection.Vertical
        self.flowLayout.sectionInset = UIEdgeInsetsMake(20, 20, 20, 20)
        self.flowLayout.itemSize = CGSizeMake(
            SizeConversationTableViewCellImage,
            SizeConversationTableViewCellImage + collectionViewCellPaddingY + collectionViewCellNameLabelHeight)
        self.collectionView = UICollectionView(frame: CGRectZero, collectionViewLayout: flowLayout)
        super.init(nibName: nil, bundle: nil)
}
        //1. collection view
        //calculate max number of cell for single row
        let maxCellNumPerRow:Int = Int(self.view.bounds.width self.flowLayout.sectionInset.left) / Int(self.flowLayout.itemSize.width + self.flowLayout.sectionInset.left)
        let maxCellNum:Int = calcCurTotalCellNum()
        print("maxCellNum=\(maxCellNum)")
        let remainValue:Int = maxCellNum % maxCellNumPerRow
//        print("remainValue=\(remainValue)")
        let divisionValue:Int = maxCellNum / maxCellNumPerRow
//        print("divisionValue=\(divisionValue)")
        let maxRowNum:Int = remainValue == 0 ? divisionValue : divisionValue + 1
//        print("maxRowNum=\(maxRowNum)")
       
        let calculatedCollectionHeight:CGFloat = self.flowLayout.sectionInset.top + (CGFloat(maxRowNum) * (self.flowLayout.itemSize.height + self.flowLayout.sectionInset.top/2)) + self.flowLayout.sectionInset.top/2
//        print("calculatedCollectionHeight=\(calculatedCollectionHeight)")
       
//        self.collectionView.autoresizingMask = [UIViewAutoresizing.FlexibleHeight , UIViewAutoresizing.FlexibleBottomMargin]
        self.collectionView.frame = CGRectMake(
            0,
            0,
            self.view.bounds.width,
            calculatedCollectionHeight)//self.view.bounds.height / 2)//self.view.bounds.height – 220)//300)//85)

暂时凑合用了:

针对几种数量不同的cell,还算基本可以满足对应的高度需求:

有多个cell的,2行的:

有很多个cell的,3行的:

只有2个cell,单行的的:

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