Merge pull request #2 from etlasky/etlasky/add-compute-size

Add compute size

SafeAreaInputAccessoryViewWrapperView.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'SafeAreaInputAccessoryViewWrapperView'
-  s.version          = '1.0.0'
+  s.version          = '1.0.1'
   s.screenshot       = 'https://user-images.githubusercontent.com/2835199/31238567-5c96c3f2-a9c8-11e7-86f5-170ebc372cdc.png'
   s.summary          = 'SafeAreaInputAccessoryViewWrapperView provides a way to wrap custom inputAccessoryView views to respect bottom safe area layouts.'
   s.description      = <<-DESC

SafeAreaInputAccessoryViewWrapperView/Classes/SafeAreaInputAccessoryViewWrapperView.swift

@@ -76,3 +76,16 @@ public class SafeAreaInputAccessoryViewWrapperView: UIView {
         return .zero
     }
 }
+
+public extension SafeAreaInputAccessoryViewWrapperView {
+    /// Returns the size of this wrapper view by computing it from the size of it's content.
+    /// NOTE: This is not used internally, but rather, it's a convenience helper for views that
+    /// might need to adjust their constraints or insets based on this size.
+    /// This will also work when changing the size of the application window due to iPad Multitasking.
+    public func computedSize() -> CGSize {
+        return systemLayoutSizeFitting(CGSize(width: UIApplication.shared.keyWindow?.bounds.width ?? UIScreen.main.bounds.width,
+                                              height: .greatestFiniteMagnitude),
+                                       withHorizontalFittingPriority: .required,
+                                       verticalFittingPriority: .fittingSizeLevel)
+    }
+}