add more extension methods for UITableView

Sources/UIKit/UITableView-Extensions.swift

@@ -12,14 +12,68 @@ public extension UITableView {
 	var sectionsIndexSet: IndexSet {
 		return IndexSet(integersIn: 0..<self.numberOfSections)
 	}
+	var visibleTopIndexPath: IndexPath? {
+        let visibleRows = indexPathsForVisibleRows ?? []
+        let firstPath: IndexPath
+        let secondPath: IndexPath
+
+        if visibleRows.isEmpty {
+            return nil
+        } else if visibleRows.count == 1 {
+            return visibleRows.first
+        } else {
+            firstPath = visibleRows[0]
+            secondPath = visibleRows[1]
+        }
+
+        let firstRowRect = rectForRow(at: firstPath)
+        return firstRowRect.origin.y > contentOffset.y ? firstPath : secondPath
+    }
+
 }
 
 
-extension UITableView {
+public extension UITableView {
     func reloadWithoutAnimation(){
         CATransaction.begin()
         CATransaction.setValue(kCFBooleanTrue, forKey: kCATransactionDisableActions)
         self.reloadData()
         CATransaction.commit()
     }
 }
+
+
+public extension UITableView {
+    func scrollToLastRow() {
+        let indexPath = IndexPath(row:0,section: 0)
+        self.scrollToRow(at: indexPath, at: .bottom, animated: true)
+    }
+    func scrollToFirstRow() {
+        let indexPath = IndexPath(row: 0, section: 0)
+        self.scrollToRow(at: indexPath, at: .top, animated: true)
+    }
+    func scrollToSelectedRow() {
+        let selectedRows = self.indexPathsForVisibleRows
+        if let selectedRow = selectedRows?[0] as NSIndexPath? {
+            self.scrollToRow(at: selectedRow as IndexPath, at: .middle, animated: true)
+        }
+    }
+    func scrollToHeader() {
+        self.scrollRectToVisible(CGRect(x: 0, y: 0, width: 1, height: 1), animated: true)
+    }
+    func removeEliminateExtraSeparators() {
+        self.tableFooterView = UIView(frame: .zero)
+        self.tableHeaderView = UIView(frame:.zero)
+    }
+    func registerCell(_ cellTypes:[AnyClass]) {
+        for cellType in cellTypes {
+            let typeString = String(describing: cellType)
+            let xibPath = Bundle(for: cellType).path(forResource: typeString, ofType: ".nib")
+            if xibPath == nil {
+                register(cellType, forCellReuseIdentifier: typeString)
+            } else {
+                register(UINib(nibName: typeString, bundle: nil), forCellReuseIdentifier: typeString)
+            }
+        }
+    }
+}