UIRefreshControl at the bottom of the UITableView iOS6?

问题

Is it possibile add UIRefreshControl at the bottom of the UITableView? I would use it to load more data. Please, Any suggest?

回答1:

I believe there won't be any simple solution to this problem. May be someone could write a separate library to implement this behaviour plus it will cause more complications once you cache data in tableview.

But let us break down the problem and that might help you in achieving what you want. I have used the following code to add more rows in the app:

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
    float endScrolling = scrollView.contentOffset.y + scrollView.frame.size.height;
    if (endScrolling >= scrollView.contentSize.height)
    {
        NSLog(@"Scroll End Called");
        [self fetchMoreEntries];
    }
}

Or you could do something like that:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if ((scrollView.contentOffset.y + scrollView.frame.size.height) >= scrollView.contentSize.height)
    {
        if (!self.isMoreData)
        {
            self.MoreData = YES;

            // call some method that handles more rows
        }
    }
}

You must have seen such methods in many question as i have described above and certainly not what you have asked for. But what you can do is while the above code in in process to load more data, you can add a subview and show a couple of images similar to what UIRefreshControl offers. Add the images in the subview to be shown as a progress until the above code gets executed. Home this helps.

By the way, i will suggest you not to do that as it will just waste your time for making something so smaller unless you are just doing it for learning purposes.

回答2:

You can use UIView to customize your refreshControl at bottom. Create UIView and add it to UITableView as footerView.

UIView* footerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];

[footerView setBackgroundColor:[UIColor colorWithPatternImage:[UIImage imageNamed:@"refreshImage.png"]]];

tableView.tableFooterView = footerView;

Hide it: tableView.tableFooterView.hidden = YES;

Implement UIScrollView delegate -

(void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    if ((scrollView.contentOffset.y + scrollView.frame.size.height) >= scrollView.contentSize.height)
    {
             tableView.tableFooterView.hidden = NO;
            // call method to add data to tableView
    }

}

before adding data to tableView save current offset by CGPoint offset = tableView.contentOffset;

call reloadData then set previously saved offset back to tableView [tableView setContentOffset:offset animated:NO];

So that you can feel new data added at bottom.

回答3:

I've been stuck on the same problem recently and write a category for UIScrollView class. Here it is CCBottomRefreshControl.

回答4:

The following answer is in Xcode 8 and Swift 3.

first declare

var spinner = UIActivityIndicatorView()

than in viewDidLoad method write the following code:

spinner = UIActivityIndicatorView(activityIndicatorStyle: .whiteLarge)
spinner.stopAnimating()
spinner.hidesWhenStopped = true
spinner.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: 60)
tableView.tableFooterView = spinner

now finally override the scrollViewDidEndDragging delegate method with following:

override func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
        let offset = scrollView.contentOffset
        let bounds = scrollView.bounds
        let size = scrollView.contentSize
        let inset = scrollView.contentInset

        let y = offset.y + bounds.size.height - inset.bottom
        let h = size.height

        let reloadDistance = CGFloat(30.0)
        if y > h + reloadDistance {
            print("fetch more data")
            spinner.startAnimating()
        }
}

回答5:

Actually the free Sensible TableView framework does provide this functionality out of the box. You specify the batch number and it will automatically fetch the data, displaying the last cell as a 'load more' cell. Once you click that cell, it will automatically load the next batch, and so on. Worth taking a look at.

回答6:

For UITableView I suggest the following approach:

-(void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{    
    // if this is the last row that we have in local data
    // and we didn't reach the total count of rows from the server side
    if (count == indexPath.row+1 && count < total)
    {
        // .. fetch more rows and reload table when data comes
    }
}

I didn't use the scroll view methods intentionally because the scroll view is slow. It happens that scroll view scrolls, we request more data, refresh more rows, and scroll view is not yet finished with scrolling, it is still decelerating and causing problems with fetching more data.

回答7:

This Swift library add pull to refresh to the bottom of UITableview.

https://github.com/marwendoukh/PullUpToRefresh-iOS

I hope this help you.

回答8:

Use CCBottomRefreshControl in cocoapods,

As it is for language objective. you can add the pod file to your swift project then run it, i have done it, no problem occurs for me

Hope it helps.

来源：https://stackoverflow.com/questions/14942460/uirefreshcontrol-at-the-bottom-of-the-uitableview-ios6

标签

uitableview

ios6

uirefreshcontrol