Merge pull request #50 from CVertex/master

Add callbacks for willScrollPreviousPage and willScrollNextPage
gblancogarcia · Aug 31, 2015 · a08d799 · a08d799
2 parents 05d2d90 + c219930
commit a08d799
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diff --git a/GBInfiniteScrollView/GBInfiniteScrollView/GBInfiniteScrollView.h b/GBInfiniteScrollView/GBInfiniteScrollView/GBInfiniteScrollView.h
@@ -266,6 +266,17 @@ typedef NS_ENUM(NSInteger, GBScrollDirection) {
 
 -(void)infiniteScrollViewDidPan:(UIPanGestureRecognizer*)pan;
 
+
+/**
+ *  Called when the GBInfiniteScrollView will scroll to next page.
+ *
+ *  @warning Optional
+ *
+ *  @param infiniteScrollView The infinite scroll view object.
+ */
+- (void)infiniteScrollViewWillScrollNextPage:(GBInfiniteScrollView *)infiniteScrollView;
+
+
 /**
  *  Called when the GBInfiniteScrollView has scrolled to next page.
  *
@@ -275,6 +286,16 @@ typedef NS_ENUM(NSInteger, GBScrollDirection) {
  */
 - (void)infiniteScrollViewDidScrollNextPage:(GBInfiniteScrollView *)infiniteScrollView;
 
+
+/**
+ *  Called when the GBInfiniteScrollView will scroll to previous page.
+ *
+ *  @warning Optional
+ *
+ *  @param infiniteScrollView The infinite scroll view object.
+ */
+- (void)infiniteScrollViewWillScrollPreviousPage:(GBInfiniteScrollView *)infiniteScrollView;
+
 /**
  *  Called when the GBInfiniteScrollView has scrolled to previous page.
  *

diff --git a/GBInfiniteScrollView/GBInfiniteScrollView/GBInfiniteScrollView.m b/GBInfiniteScrollView/GBInfiniteScrollView/GBInfiniteScrollView.m
@@ -1676,6 +1676,11 @@ - (void)scrollToNextPage
             y = CGRectGetMaxY(frame);
         }
 
+        // Notify delegate we're going to the next page
+        if ([self.infiniteScrollViewDelegate respondsToSelector:@selector(infiniteScrollViewWillScrollNextPage:)]) {
+            [self.infiniteScrollViewDelegate infiniteScrollViewWillScrollNextPage:self];
+        }
+
         CGPoint point = CGPointMake(x, y);
         [self setContentOffsetWithCustomDuration:point];
     }
@@ -1700,6 +1705,12 @@ - (void)scrollToPreviousPage
             y = CGRectGetMinY(frame) - [self pageHeight];
         }
 
+
+        // Notify delegate we're going to the next page
+        if ([self.infiniteScrollViewDelegate respondsToSelector:@selector(infiniteScrollViewWillScrollPreviousPage:)]) {
+            [self.infiniteScrollViewDelegate infiniteScrollViewWillScrollPreviousPage:self];
+        }
+
         CGPoint point = CGPointMake(x, y);
         [self setContentOffsetWithCustomDuration:point];
     }

diff --git a/GBInfiniteScrollViewDemo/GBInfiniteScrollViewDemo/GBViewController.m b/GBInfiniteScrollViewDemo/GBInfiniteScrollViewDemo/GBViewController.m
@@ -633,13 +633,25 @@ - (void)stopAutoScroll
     self.autoScroll = NO;
 }
 
+- (void)infiniteScrollViewWillScrollNextPage:(GBInfiniteScrollView *)infiniteScrollView {
+    if (self.debug) {
+        NSLog(@"Will scroll next page");
+    }
+}
+
 - (void)infiniteScrollViewDidScrollNextPage:(GBInfiniteScrollView *)infiniteScrollView
 {
     if (self.debug) {
         NSLog(@"Did scroll next page");
     }
 }
 
+- (void)infiniteScrollViewWillScrollPreviousPage:(GBInfiniteScrollView *)infiniteScrollView {
+    if (self.debug) {
+        NSLog(@"Will scroll previous page");
+    }
+}
+
 - (void)infiniteScrollViewDidScrollPreviousPage:(GBInfiniteScrollView *)infiniteScrollView
 {
     if (self.debug) {