Add possibility to customize cell size

Author: Anna-Mariia Shkarlinska

CarLensCollectionViewLayout/CarLensCollectionViewLayout.swift

@@ -40,9 +40,10 @@ public final class CarLensCollectionViewLayout: UICollectionViewFlowLayout {
         guard let collectionView = collectionView else { return }
         scrollDirection = .horizontal
         minimumLineSpacing = options.minimumSpacing
-        itemSize = CGSize(width: collectionView.bounds.width - 60, height: collectionView.bounds.height)
+        itemSize = options.itemSize ?? CGSize(width: collectionView.bounds.width - 60, height: collectionView.bounds.height)
         let sidesInset = (collectionView.bounds.width - itemSize.width) / 2
-        collectionView.contentInset =  .init(top: 0, left: sidesInset, bottom: 0, right: sidesInset)
+        let topAndBottomInset = (collectionView.bounds.height - itemSize.height) / 2
+        collectionView.contentInset = .init(top: topAndBottomInset, left: sidesInset, bottom: topAndBottomInset, right: sidesInset)
         collectionView.decelerationRate = options.decelerationRate
         collectionView.showsHorizontalScrollIndicator = options.shouldShowScrollIndicator
     }

CarLensCollectionViewLayout/CarLensCollectionViewLayoutOptions.swift

@@ -7,7 +7,7 @@
 
 import Foundation
 
-/// The optional configuration of CarLensCollectionViewLayout.
+/// The optional configuration of CarLensCollectionViewLayout. Use this if you need to customize `CarLensCollectionViewLayout`.
 public struct CarLensCollectionViewLayoutOptions {
 
     /// A minimum spacing between cells.
@@ -19,16 +19,22 @@ public struct CarLensCollectionViewLayoutOptions {
     /// A value indicating whether collection view should have a scroll indicator.
     let shouldShowScrollIndicator: Bool
 
+    /// The size to use for cells.
+    let itemSize: CGSize?
+    
     /// The initialization of the optional layout configuration.
+    /// You can initialize it with any of the parameters available. Others will be configured automatically.
     ///
     /// - Parameters:
     ///   - minimumSpacing: A minimum spacing between cells. The default value is `20`.
     ///   - decelerationRate: A deceleration for a scroll view. The default value is `.fast`.
     ///   - shouldShowScrollIndicator: A value indicating whether collection view should have a scroll indicator. The default value is `false`.
-    public init(minimumSpacing: CGFloat = 20, decelerationRate: UIScrollView.DecelerationRate = UIScrollView.DecelerationRate.fast, shouldShowScrollIndicator: Bool = false) {
+    ///   - itemSize: The size to use for cells. The default height is equal to a collection view height. The width is equal to the `collection view width - 60`.
+    public init(minimumSpacing: CGFloat = 20, decelerationRate: UIScrollView.DecelerationRate = UIScrollView.DecelerationRate.fast, shouldShowScrollIndicator: Bool = false, itemSize: CGSize? = nil) {
         self.minimumSpacing = minimumSpacing
         self.decelerationRate = decelerationRate
         self.shouldShowScrollIndicator = shouldShowScrollIndicator
+        self.itemSize = itemSize
     }
 
 }