From 81f3b87c884765444a404b2f22afd1bdd11df8f0 Mon Sep 17 00:00:00 2001
From: Gua <desgard_duan@foxmail.com>
Date: Fri, 9 Feb 2018 09:44:03 +0800
Subject: [PATCH] Update PagerTabStripViewController.swift

---
 Sources/PagerTabStripViewController.swift | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Sources/PagerTabStripViewController.swift b/Sources/PagerTabStripViewController.swift
index 6ae787fe..861e4747 100644
--- a/Sources/PagerTabStripViewController.swift
+++ b/Sources/PagerTabStripViewController.swift
@@ -147,6 +147,22 @@ open class PagerTabStripViewController: UIViewController, UIScrollViewDelegate {
     open override var shouldAutomaticallyForwardAppearanceMethods: Bool {
         return false
     }
+    
+    // 这里是 default selector pager
+    open func setupDefaultViewController(at index: Int) {
+        guard currentIndex != index else { return }
+        guard isViewLoaded, !self.viewControllers.isEmpty else {
+            currentIndex = index
+            return
+        }
+        guard view.window != nil else {
+        let step = (currentIndex < index) ? 1 : -1
+            for subindex in stride(from: currentIndex+step, through: index, by: step) {
+                containerView.setContentOffset(CGPoint(x: pageOffsetForChild(at: subindex), y: 0), animated: false)
+            }
+            return
+        }
+    }
 
     open func moveToViewController(at index: Int, animated: Bool = true) {
         guard isViewLoaded && view.window != nil && currentIndex != index else {