页面编辑-页面范围错误时清空页面范围控件的数据

PDF Office/PDF Master/Class/PDFTools/PageEdit/Controller/KMPDFEditViewController.swift

@@ -956,6 +956,9 @@ extension KMPDFEditViewController {
             alert.messageText = NSLocalizedString("Invalid page range or the page number is out of range. Please try again.", comment: "")
             alert.runModal()
             self.toolBar.setPageRangeString("")
+            DispatchQueue.main.async {
+                self.view.window?.makeFirstResponder(self.toolBar.pageRangeView?.textField)
+            }
             return
         }