PDForm(iOS) - 刷新Undo Redo处理

Form-Ctrl-Demo/Form-Ctrl-Demo/CPDFViewController.m

@@ -156,6 +156,11 @@
     [self.formBar updateStatus];
 }
 
+- (void)selectDocumentRefresh {
+    [super selectDocumentRefresh];
+    [self.formBar initUndoRedo];
+}
+
 - (void)enterViewerMode {
     self.pdfListView.toolModel = CToolModelViewer;
     self.navigationTitle = NSLocalizedString(@"Viewer", nil);