CODEWITHSUNDEEP
iphoneobjective-ciosuitableviewuiview
donkim
donkim

Reputation: 13137

insertSubview:belowSubview: in UITableViews

I have a UITableView with UITableViewCells that are swipable. When a cell is swiped, I want a view to be visible (revealed) underneath that cell. Here's the code that I have:

UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];

_cellBack = [[UIView alloc] initWithFrame:CGRectMake(0, cell.frame.origin.y, cell.frame.size.width, cell.frame.size.height)];
_cellBack.backgroundColor = [UIColor whiteColor];
[self.tableView insertSubview:_cellBack belowSubview:cell];

for (int i = 0; i < [self.tableView subviews].count; i++) {
    UIView *v = [[self.tableView subviews] objectAtIndex:i];

    if ([v isEqual:_cellBack]) {
        NSLog(@"cellBack %d", i);
    }
    if ([v isEqual:cell]) {
        NSLog(@"cell %d", i);
    }
}

In the for loop, I check to see if the views' indexes are as I expect, and indeed they are; _cellBack has an index that is one less than cell's index.

When I replace the insertSubview:belowSubview: call with insertSubview:aboveSubview:, it works fine (albeit with the white UIView showing up above the swiped cell), so it's not a matter of not allocating _cellBack properly. I've also tried insertSubview:atIndex: and that didn't work either..

What could be causing this?

Thanks!

Upvotes: 0

Views: 2219

Answers (3)

Bluedays
Bluedays

Reputation: 151

To make the SideSwipeTableView example work on ios7 & previous, simply change the line to 

[cell.superview insertSubview:self.sideSwipeView belowSubview:cell];

Anything else pushes the back view on top of the cell and you don't get any animation effect, animation happening behind your background cell! To check this change the offset of the cell to less than the full screen to check that your cell is still on the top and background one is really below. From:

cell.frame = CGRectMake(direction == UISwipeGestureRecognizerDirectionRight ? cellFrame.size.width : -cellFrame.size.width, cellFrame.origin.y, cellFrame.size.width, cellFrame.size.height);

to

cell.frame = CGRectMake(direction == UISwipeGestureRecognizerDirectionRight ? cellFrame.size.width/2 : -cellFrame.size.width/2, cellFrame.origin.y, cellFrame.size.width, cellFrame.size.height);

Upvotes: 2

donkim
donkim

Reputation: 13137

So it turns out that, if I add it to another view, the code works as expected.

Here's where I added it:

    _cellBack = [[UIView alloc] initWithFrame:CGRectMake(0, cell.contentView.frame.origin.y, cell.frame.size.width, cell.frame.size.height)];
    _cellBack.backgroundColor = [UIColor whiteColor];

    [cell insertSubview:_cellBack belowSubview:cell.contentView];

I'm still not sure why the code in the question doesn't work. The SideSwipeTableView from this github account has code similar to what I had before and it works fine.

Upvotes: 0

ragamufin
ragamufin

Reputation: 4162

UITableView's already have the ability to put things behind cells. It's the backgroundView of the cell. Why don't you try that instead so you would do the following:

cell.selectedBackgroundView = _cellBack;

Upvotes: 1

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