Merge pull request #93 from leoMehlig/master

Adds stickyHeader options

Framework/Sources/SpreadsheetView+UIScrollViewDelegate.swift

@@ -19,15 +19,15 @@ extension SpreadsheetView: UIScrollViewDelegate {
             tableView.delegate = self
         }
 
-        if tableView.contentOffset.x < 0 {
+        if tableView.contentOffset.x < 0 && !stickyColumnHeader {
             let offset = tableView.contentOffset.x * -1
             cornerView.frame.origin.x = offset
             columnHeaderView.frame.origin.x = offset
         } else {
             cornerView.frame.origin.x = 0
             columnHeaderView.frame.origin.x = 0
         }
-        if tableView.contentOffset.y < 0 {
+        if tableView.contentOffset.y < 0 && !stickyRowHeader {
             let offset = tableView.contentOffset.y * -1
             cornerView.frame.origin.y = offset
             rowHeaderView.frame.origin.y = offset

Framework/Sources/SpreadsheetView.swift

@@ -219,6 +219,20 @@ public class SpreadsheetView: UIView {
             tableView.alwaysBounceHorizontal = newValue
         }
     }
+
+    /// A Boolean value that determines wheather the row header always sticks to the top.
+    /// - Note: `bounces` has to be `true` and there has to be at least one `frozenRow`.
+    /// The default value is `false`.
+    ///
+    /// - SeeAlso: `stickyColumnHeader`
+    public var stickyRowHeader: Bool = false
+
+    /// A Boolean value that determines wheather the column header always sticks to the top.
+    /// - Note: `bounces` has to be `true` and there has to be at least one `frozenColumn`.
+    /// The default value is `false`.
+    ///
+    /// - SeeAlso: `stickyRowHeader`
+    public var stickyColumnHeader: Bool = false
 
     /// A Boolean value that determines whether paging is enabled for the scroll view.
     /// - Note: If the value of this property is `true`, the scroll view stops on multiples of the scroll view’s bounds when the user scrolls.