development: updated Grid.deferred to lazy calculate grid properties

Sources/iOS/ControlView.swift

@@ -220,7 +220,6 @@ open class ControlView: View {
             }
             
             grid.deferred = false
-            grid.reload()
         }
     }
     

Sources/iOS/Grid.swift

@@ -108,7 +108,13 @@ public class GridOffset {
 
 public class Grid {
     /// Defer the calculation.
-    public var deferred = false
+    public var deferred = false {
+        didSet {
+            if !deferred {
+                reload()
+            }
+        }
+    }
     
     /// Context view.
     internal weak var context: UIView?