Add: check permit index path

Classes/Source.swift

@@ -22,6 +22,10 @@ public class Source: NSObject {
 
     public var didMoveRow: ((NSIndexPath, NSIndexPath) -> Void)?
 
+    func isPermitIndexPath(indexPath: NSIndexPath) -> Bool {
+        return sections.count > indexPath.section && sections[indexPath.section].rows.count > indexPath.row
+    }
+
     public func addSection(section: SectionType) -> Self {
         sections.append(section)
         return self
@@ -200,6 +204,9 @@ extension Source: UITableViewDelegate {
     }
 
     public func tableView(tableView: UITableView, didEndDisplayingCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
+        if !isPermitIndexPath(indexPath) {
+            return
+        }
         let row = sectionFor(indexPath).rowFor(indexPath) as? RowDelegateType
         row?.didEndDisplayCell(tableView, cell: cell, indexPath: indexPath)
     }

ShoyuTests/SourceTests.swift

@@ -120,6 +120,23 @@ class SourceTests: XCTestCase {
         XCTAssertEqual(source.sectionFor(destinationIndexPath).rowFor(destinationIndexPath).reuseIdentifier, reuserIdentifierFromIndexPath(sourceIndexPath))
     }
 
+    func testPermitIndexPath() {
+        let rowLimit = UInt(10)
+        let sectionLimit = UInt(10)
+
+        let source = Source() { source in
+            source.createSections(sectionLimit) { _, section in
+                section.createRows(rowLimit) { _ in }
+            }
+        }
+
+        let notFailIndexPath = NSIndexPath(forRow: Int(rowLimit - 1), inSection: Int(sectionLimit - 1))
+        XCTAssertTrue(source.isPermitIndexPath(notFailIndexPath))
+
+        let failIndexPath = NSIndexPath(forRow: Int(rowLimit), inSection: Int(sectionLimit))
+        XCTAssertFalse(source.isPermitIndexPath(failIndexPath))
+    }
+
     func testBenchmarkSource() {
         class HeaderView: UIView { }
         class FooterView: UIView { }