UICollectionView单元格间距基于设备屏幕大小

Question

我已经实现了一个UICollectionView,单元格大小为w90 h90.当我在iPhone 6上运行时,我在单元格之间获得了适当的间距,但是当我在iPhone 5s上运行时,我在单元格之间获得了更多的间距.我的问题是我如何根据设备屏幕大小更改单元格大小,假设单元格大小为w80 h80,我也可以在iPhone 5s上获得正确的结果.我现在正在做的是

 override func viewWillAppear(animated: Bool) {

        var scale = UIScreen.mainScreen().scale as CGFloat
        println("Scale :\(scale)")

        var cellSize = (self.collectionViewLayout as UICollectionViewFlowLayout).itemSize
        println("Cell size :\(cellSize)")

        imageSize = CGSizeMake(cellSize.width * scale , cellSize.height * scale)
        println("Image size : \(imageSize)")

    }

// sizeForItemAtIndexPath

  func collectionView(collectionView: UICollectionView,layout collectionViewLayout: UICollectionViewLayout,sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize
   {

        return imageSize!

   }

iPhone 6上的结果:

iPhone 5s的结果

Objective-C/Swift对解决方案都很好.谢谢.

Answer 1

第1步:实现UICollectionViewDelegateFlowLayout(如果没有完成).

第2步:使用UICollectionViewDelegateFlowLayout的委托方法.

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize
{
return CGSizeMake((UIScreen.mainScreen().bounds.width-15)/4,120); //use height whatever you wants.
}

第3步:转到您拥有CollectionView的XIB或StoryBoard.

第4步:在您拥有CollectionView的XIB或StoryBoard中,单击CollectionView.

步骤5:转到InterfaceBuilder,然后在第二个选项卡(即:Size Inspector)中设置Min Spacing

对于Cells = 5

对于Lines = 5

那个.

注意:

• 如果您想在cell = 5之间建立间距,则可以使用此解决方案.
• 如果您的间距不同于5,那么您需要在委托方法中更改值15.
• 例如:单元格之间的间距= 10,然后将代理15更改为10x3 = 30

return CGSizeMake((UIScreen.mainScreen().bounds.width-30)/4,120);

• 并设置Min Spacing

For Cells = 10

For Lines = 10

反之亦然.

Swift 3版

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let width = UIScreen.main.bounds.width
    return CGSize(width: (width - 10)/3, height: (width - 10)/3) // width & height are the same to make a square cell
}

Answer 2

有一个稍微灵活的答案

允许您调整列数和间距,扩展Zaid Pathan的答案

// MARK: UICollectionViewDelegateFlowLayout delegate method
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize
{
    let cellSpacing = CGFloat(2) //Define the space between each cell
    let leftRightMargin = CGFloat(20) //If defined in Interface Builder for "Section Insets"
    let numColumns = CGFloat(3) //The total number of columns you want

    let totalCellSpace = cellSpacing * (numColumns - 1)
    let screenWidth = UIScreen.mainScreen().bounds.width
    let width = (screenWidth - leftRightMargin - totalCellSpace) / numColumns
    let height = CGFloat(110) //whatever height you want

    return CGSizeMake(width, height);
}