Add property control current page update action.

XLPagerTabStrip/XL/Controllers/XLPagerTabStripViewController.h

@@ -82,6 +82,8 @@ typedef NS_ENUM(NSUInteger, XLPagerTabStripDirection) {
 
 @property (readonly) NSUInteger currentIndex;
 @property BOOL skipIntermediateViewControllers;
+// When user scroll the pager, waiting did end decelerating update page index, Default is NO.
+@property BOOL shouldDidEndDeceleratingUpdatePage;
 
 -(void)moveToViewControllerAtIndex:(NSUInteger)index;
 -(void)moveToViewController:(UIViewController *)viewController;

XLPagerTabStrip/XL/Controllers/XLPagerTabStripViewController.m

@@ -71,6 +71,7 @@
     _dataSource = self;
     _lastContentOffset = 0.0f;
     _skipIntermediateViewControllers = YES;
+    _shouldDidEndDeceleratingUpdatePage = NO;
 }
 
 - (void)viewDidLoad
@@ -212,13 +213,20 @@
     return fmodf(self.containerView.contentOffset.x, [self pageWidth]) / [self pageWidth];
 }
 
+- (void)updateCurrentPage
+{
+    NSUInteger currentPage = [self pageForContentOffset:self.containerView.contentOffset.x];
+    if (currentPage != self.currentIndex){
+        self.currentIndex = currentPage;
+    }
+}
+
 -(void)updateContent
 {
     NSArray * childViewControllers = self.pagerTabStripChildViewControllers;
     self.containerView.contentSize = CGSizeMake(CGRectGetWidth(self.containerView.bounds) * childViewControllers.count, self.containerView.contentSize.height);
-    NSUInteger currentPage = [self pageForContentOffset:self.containerView.contentOffset.x];
-    if (currentPage != self.currentIndex){
-        self.currentIndex = currentPage;
+    if (!self.shouldDidEndDeceleratingUpdatePage) {
+        [self updateCurrentPage];
     }
 
     [childViewControllers enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
@@ -296,6 +304,12 @@
     }
 }
 
+- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
+    if (self.shouldDidEndDeceleratingUpdatePage) {
+        [self updateCurrentPage];
+    }
+}
+
 -(void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
 {
     if (self.containerView == scrollView && _originalPagerTabStripChildViewControllers){