Now doesnt crash on 4 inch devices, v 0.1.10

Author: Oscar Apeland

SwipeableViewController.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
 s.name             = 'SwipeableViewController'
-s.version          = '0.1.9'
+s.version          = '0.1.10'
 s.summary          = 'A small UI component to build UIPageViewController-y views in your app.'
 
 s.description      = <<-DESC

SwipeableViewController/Source/SwipeableCollectionViewFlowLayout.swift

@@ -19,11 +19,19 @@ open class SwipeableCollectionViewFlowLayout: UICollectionViewFlowLayout {
         setup()
     }
 
+    private var collectionViewObservation: NSKeyValueObservation?
     private func setup() {
-        sectionInset = UIEdgeInsets(top: 0.0, left: 10.0, bottom: 0.0, right: 10.0)
-        estimatedItemSize = CGSize(width: 60.0, height: 52.0)
-        minimumInteritemSpacing = .leastNonzeroMagnitude
-        minimumLineSpacing = .leastNonzeroMagnitude
-        scrollDirection = .horizontal
+        collectionViewObservation = observe(\.collectionView, options: [.new]) { (layout, change) in
+            guard let newCollectionView = change.newValue as? UICollectionView else {
+                return
+            }
+            
+            self.sectionInset = UIEdgeInsets(top: 0.0, left: 10.0, bottom: 0.0, right: 10.0)
+            self.estimatedItemSize = CGSize(width: 60, height: newCollectionView.frame.height)
+            self.minimumInteritemSpacing = .leastNonzeroMagnitude
+            self.minimumLineSpacing = .leastNonzeroMagnitude
+            self.scrollDirection = .horizontal
+        }
+
     }
 }