+ [ios] list component section header sticky event

apache · May 9, 2017 · b9a1cd0 · b9a1cd0
1 parent 5d4d6ba
commit b9a1cd0
Showing 1 changed file with 21 additions and 0 deletions.
diff --git a/ios/sdk/WeexSDK/Sources/Component/WXListComponent.m b/ios/sdk/WeexSDK/Sources/Component/WXListComponent.m
@@ -100,6 +100,8 @@ - (NSString *)description
 
 @interface WXListComponent () <UITableViewDataSource, UITableViewDelegate, WXCellRenderDelegate, WXHeaderRenderDelegate>
 
+@property (nonatomic, assign) NSUInteger currentTopVisibleSection;
+
 @end
 
 @implementation WXListComponent
@@ -576,6 +578,25 @@ - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSIntege
     }
 }
 
+- (void)scrollViewDidScroll:(UIScrollView *)scrollView
+{
+    [super scrollViewDidScroll:scrollView];
+    NSIndexPath *topCellPath = [[_tableView indexPathsForVisibleRows] objectAtIndex:0];
+    if (self.currentTopVisibleSection != topCellPath.section) {
+        if (self.currentTopVisibleSection) {
+            WXSection *removeSection = [_sections objectAtIndex:self.currentTopVisibleSection];
+            if (removeSection.header && [removeSection.header.events containsObject:@"unSticky"]) {
+                [removeSection.header fireEvent:@"unSticky" params:nil];
+            }
+        }
+        self.currentTopVisibleSection = topCellPath.section;
+        WXSection *showSection = [_sections objectAtIndex:topCellPath.section];
+        if (showSection.header && [showSection.header.events containsObject:@"sticky"]) {
+            [showSection.header fireEvent:@"sticky" params:nil];
+        }
+    }
+}
+
 - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
 {
     WXHeaderComponent *header = ((WXSection *)_completedSections[section]).header;