iOS：自适应集合视图单元格宽度

Question

I'm trying to make a grid view on iOS with adaptive column width. On Android it's possible to do this by setting stretchMode attribute to spacingWidth . This attribute take the cell width as minimum width and grow cell automatically if there is free space available but no enough to add another column keeping the same space between column everywhere.

I didn't found any way to do that on iOS.

It look like that (left image) on iPhone 6, but on iPhone 5 (right image) the space is very big and ugly. I wan't to auto resize cells to avoid this big space.

How can i do that on iOS ?

(I'm using Xcode 6.1)

Thanks

EDIT : This i why i wan't (black space is approximatively desired additional cell width, sorry my draw is ugly I did it quickly)

EDIT 2:

I tried to calculate new size with this code, but the result is "strange" (wrong size, position) , i think i missed something

    let CELL_SIZE : Float = 92
    let CELL_MARGIN : Float = 10
    let COLLECTION_VIEW_MARGIN : Float = 20 //Left right margin
    let screenWidth = Float(UIScreen.mainScreen().bounds.width)
    let numberOfCell =  Float(Int(screenWidth / (CELL_SIZE + CELL_MARGIN + COLLECTION_VIEW_MARGIN)))

    let oldCellSize = Float(cell.frame.width)
    var newCellSize : Float
    if(numberOfCell >= 2){
        newCellSize = (screenWidth / numberOfCell) - (CELL_MARGIN * (numberOfCell-1))
    } else {
        newCellSize = (screenWidth / numberOfCell)        }

    let indexPathRow = Float(indexPath.row)

    var xOffsetMultiplier = indexPathRow % numberOfCell
    if(xOffsetMultiplier == 0){
        xOffsetMultiplier = numberOfCell
    }

    var newX : Float = 0
    if(xOffsetMultiplier == 1){
        newX = COLLECTION_VIEW_MARGIN / 2
    } else {
        newX = (newCellSize + CELL_MARGIN) * (xOffsetMultiplier-1) + (COLLECTION_VIEW_MARGIN / 2)
    }

    var frame = CGRectMake(CGFloat(newX), cell.frame.minY, CGFloat(newCellSize), cell.frame.height)

    cell.frame = frame

This code is written in func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell in my ViewController

Answer 1

您应该使用UICollectionViewFlowLayout根据集合视图大小采用单元格大小。