Added delegate methods for will change page and did change page.

btate · Aug 13, 2014 · d375b03 · d375b03
1 parent e8f5c29
commit d375b03
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diff --git a/BTGridPager/BTGridPager.h b/BTGridPager/BTGridPager.h
@@ -104,6 +104,22 @@ typedef NSUInteger BTGridResetMode;
  */
 - (void) gridPager: (BTGridPager *) gridPager didSelectViewAtGridIndex: (BTGridIndex *) gridIndex;
 
+/**
+ *  Tells the delegate that the grid pager will change pages.
+ *
+ *  @param gridPager The grid pager
+ *  @param newIndex  The page index
+ */
+- (void) gridPager: (BTGridPager *) gridPager willChangePage: (BTGridIndex *) newIndex;
+
+/**
+ *  Tells the delegate that the grid pager changed pages.
+ *
+ *  @param gridPager The grid pager
+ *  @param newIndex  The page index
+ */
+- (void) gridPager: (BTGridPager *) gridPager didChangePage: (BTGridIndex *) newIndex;
+
 @end
 
 /**
@@ -144,4 +160,5 @@ typedef NSUInteger BTGridResetMode;
  */
 - (UIView *) gridPager: (BTGridPager *) gridPager gridViewAtGridIndex: (BTGridIndex *) gridIndex withFrame: (CGRect) frame;
 
+
 @end
diff --git a/BTGridPager/BTGridPager.m b/BTGridPager/BTGridPager.m
@@ -164,6 +164,10 @@ - (void) loadViewsForCurrentIndex{
     NSAssert([self.gridPagerDataSource respondsToSelector:@selector(numberOfRowsInGridPager:)], @"Implement DataSource Methods!!!!!");
     NSAssert([self.gridPagerDataSource respondsToSelector:@selector(gridPager:numberOfColumnsForRow:)], @"Implement DataSource Methods!!!!!");
 
+    if ([self.gridPagerDelegate respondsToSelector:@selector(gridPager:willChangePage:)]) {
+        [self.gridPagerDelegate gridPager:self willChangePage:[_currentIndex copy]];
+    }
+
     _numRows = (int)[self.gridPagerDataSource numberOfRowsInGridPager:self];
     if (_numRows <= 0)
         return;
@@ -229,6 +233,9 @@ - (void) loadViewsForCurrentIndex{
         [subview removeFromSuperview];
     }
 
+    if ([self.gridPagerDelegate respondsToSelector:@selector(gridPager:didChangePage:)]) {
+        [self.gridPagerDelegate gridPager:self didChangePage:[_currentIndex copy]];
+    }
 }
 
 /**

diff --git a/BTGridPagerDemo/BTGridPagerDemo/ViewController.m b/BTGridPagerDemo/BTGridPagerDemo/ViewController.m
@@ -41,6 +41,26 @@ - (void) gridPager: (BTGridPager *) gridPager didSelectViewAtGridIndex: (BTGridI
     NSLog(@"selected %@", gridIndex);
 }
 
+/**
+ *  Tells the delegate that the grid pager will change pages.
+ *
+ *  @param gridPager The grid pager
+ *  @param newIndex  The page index
+ */
+- (void) gridPager: (BTGridPager *) gridPager willChangePage: (BTGridIndex *) newIndex{
+    NSLog(@"will change pages %@", newIndex);
+}
+
+/**
+ *  Tells the delegate that the grid pager changed pages.
+ *
+ *  @param gridPager The grid pager
+ *  @param newIndex  The page index
+ */
+- (void) gridPager: (BTGridPager *) gridPager didChangePage: (BTGridIndex *) newIndex{
+    NSLog(@"on new page %@", newIndex);
+}
+
 #pragma mark - GridPagerDataSource
 
 /**