Demo of rendering bug in CKRefreshControl, replace contents of DefaultRefreshController in the RefreshControlDemo with contents of this gist.

DefaultRefreshController.m

// DefaultRefreshController.m
//
// Copyright (c) 2012 Instructure, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#import "DefaultRefreshController.h"
#import <CKRefreshControl/CKRefreshControl.h>

@implementation DefaultRefreshController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.refreshControl = [[UIRefreshControl alloc] init];
    [self.refreshControl addTarget:self action:@selector(doRefresh:) forControlEvents:UIControlEventValueChanged];
}

- (void)doRefresh:(CKRefreshControl *)sender {
    NSLog(@"refreshing");
    [self.refreshControl performSelector:@selector(endRefreshing) withObject:nil afterDelay:1.0];
}

#pragma mark - Table view data source

//use sections instead of rows
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 20;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return 1;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    
    // Configure the cell...
    cell.textLabel.text = @"Pull down!";
    
    return cell;
}


//use some section indexes
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
    NSMutableArray* indexes = [NSMutableArray array];
    
    for (int i = 0; i < 20; i++) {
        [indexes addObject:[NSString stringWithFormat:@"%d", i]];        
    }
    return indexes;
}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}

@end