测试UITableView的部分页脚

Question

Trying to test a UISegmentedControl in a UITableView, which is created in the UITableViewDelegate method:

-(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {
    if (section == 0) {
        UIView *container = [[UIView alloc]initWithFrame:CGRectMake(0, 0, tableView.frame.size.width, [self tableView:tableView heightForFooterInSection:section])];
        [self.segmentedControl setCenter:container.center];
        [container addSubview:self.segmentedControl];
        return container;
    } else {
        return [super tableView:tableView viewForFooterInSection:section];
    }
}

In the test class:

-(void)testSegmentedControl {
    MyTableViewController *viewController = [[MyTableViewController alloc]initWithNibName:@"MyTableViewController" bundle:nil];
    [viewController.tableView reloadData];

    // Getting the footer via the delegate is cheating IMO.
    UITableViewHeaderFooterView *footer =  [viewController.tableView footerViewForSection:0];
    UISegmentedControl *segmentControl = footer.subviews[0];
    // do stuff to the segmentControl then check the tableView.
    [viewController.tableView reloadData];
}

I'm currently manipulating the UISegmentedControl via a global property ( viewController.segmentedControl ) and then calling [viewController.tableView reloadData] to update the state of the UITableViewCell s. But it seems to me that getting the footer from [viewController.tableView footerViewForSection:0] is the correct way to test. Any guidance is appreciated.

Edit:

As suggested by John Rodgers, I've tried dequeuing a UITableViewHeaderFooterView like we'd do in cellForRowAtIndexPath:

-(UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {
    if (section == 0) {
        UITableViewHeaderFooterView *footer = [tableView dequeueReusableHeaderFooterViewWithIdentifier:self.footerReuseId];
        if (footer == nil) {
            footer = [[UITableViewHeaderFooterView alloc]initWithReuseIdentifier:self.footerReuseId];
        }
        if (![footer.subviews containsObject:self.segmentedControl]) {
            [footer addSubview:self.segmentedControl];
        }
        return footer;
    } else {
        return [super tableView:tableView viewForFooterInSection:section];
    }
}

No improvement in the test method:

-(void)testSegmentedControl {
    MyTableViewController *viewController = [[MyTableViewController alloc]initWithNibName:@"MyTableViewController" bundle:nil];
    [viewController.tableView reloadData];
    UITableViewHeaderFooterView *footer1 = (UITableViewHeaderFooterView *)[viewController.tableView dequeueReusableHeaderFooterViewWithIdentifier:viewController.footerReuseId];
    UITableViewHeaderFooterView *footer2 = [viewController.tableView footerViewForSection:0];
    // Break point shows that footer1 and footer2 are nil.
}

Answer 1

The problem you're having here, is that footerViewForSection is actually a UITableView method that's used provide it with the view for that section.

You're going to have to dequeue a reusable UITableViewHeaderFooterView in order to test it in your test class:

UITableViewHeaderFooterView *footer = [tableView dequeueReusableHeaderFooterViewWithIdentifier:mySectionFooterViewIdentifier];

This is exactly what you should be using in your footerViewForSection method you provide for your table view, you're just dequeueing it in the test class instead.

Hope this helps!

~ J