Implement Pull to Refresh for RSS Feed [closed] - ios

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I have an RSS feed in my app and I'm trying to figure out how to implement pull to refresh. Here is my code:
#import "ActionAlertsViewController.h"
#import "RSSChannel.h"
#import "RSSItem.h"
#import "WebViewController.h"
#import "DTCustomColoredAccessory.h"
#import "SVProgressHUD.h"
#implementation ActionAlertsViewController
{
UIActivityIndicatorView *loadingIndicator;
}
#synthesize webViewController;
- (void)viewDidLoad
{
UIImageView *background = [[UIImageView alloc]init];
background.image = [UIImage imageNamed:#"plain_app-background.png"];
self.tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStyleGrouped];
[self.tableView setBackgroundView:background];
self.title = #"Action Alerts";
[[SVProgressHUD appearance]setHudBackgroundColor:[UIColor blackColor]];
[[SVProgressHUD appearance]setHudForegroundColor:[UIColor whiteColor]];
[SVProgressHUD showWithStatus:#"Loading"];
}
- (void)viewDidDisappear:(BOOL)animated
{
[SVProgressHUD dismiss];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
NSLog(#"%# found a %# element", self, elementName);
if ([elementName isEqual:#"channel"])
{
// If the parser saw a channel, create new instance, store in our ivar
channel = [[RSSChannel alloc]init];
// Give the channel object a pointer back to ourselves for later
[channel setParentParserDelegate:self];
// Set the parser's delegate to the channel object
[parser setDelegate:channel];
}
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// return 0;
NSLog(#"channel items %d", [[channel items]count]);
return [[channel items]count];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 50;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// return nil;
UIImageView *image = [[UIImageView alloc]init];
image.image = [UIImage imageNamed:#"CellImage.png"];
UIImageView *background = [[UIImageView alloc]init];
background.image = [UIImage imageNamed:#"plain_app-background.png"];
UIImageView *highlightedCellImage = [[UIImageView alloc]init];
highlightedCellImage.image = [UIImage imageNamed:#"HighlightedCellImage"];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"UITableViewCell"];
if (cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"UITableViewCell"];
cell.textLabel.font=[UIFont systemFontOfSize:16.0];
}
RSSItem *item = [[channel items]objectAtIndex:[indexPath row]];
NSDateFormatter *formatter = [[NSDateFormatter alloc]init];
[formatter setDateFormat:#"EEE, dd MMM yyyy HH:mm:ssZ"];
NSDate *pubDate = [formatter dateFromString:[item date]];
[formatter setDateStyle:NSDateFormatterMediumStyle];
NSString *dateString = [formatter stringFromDate:pubDate];
NSLog(#"Date String: %#", dateString);
[[cell textLabel]setText:[item title]];
[[cell detailTextLabel]setText:dateString];
NSLog(#"Date: %#", [item date]);
tableView.backgroundColor = [UIColor clearColor];
cell.textLabel.backgroundColor = [UIColor clearColor];
cell.textLabel.highlightedTextColor = [UIColor blueColor];
cell.textLabel.font = [UIFont fontWithName:#"FranklinGothicStd-ExtraCond" size:20.0];
cell.textLabel.textColor = [UIColor whiteColor];
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
cell.detailTextLabel.highlightedTextColor = [UIColor blueColor];
cell.detailTextLabel.font = [UIFont fontWithName:#"FranklinGothicStd-ExtraCond" size:14.0];
cell.detailTextLabel.textColor = [UIColor whiteColor];
cell.backgroundView = image;
cell.selectedBackgroundView = highlightedCellImage;
tableView.backgroundView = background;
DTCustomColoredAccessory *accessory = [DTCustomColoredAccessory accessoryWithColor:cell.textLabel.textColor];
accessory.highlightedColor = [UIColor blueColor];
cell.accessoryView =accessory;
return cell;
}
- (void)fetchEntries
{
// Create a new data container for the stuff that comes back from the service
xmlData = [[NSMutableData alloc]init];
// Construct a URL that will ask the service for what you want
NSURL *url = [NSURL URLWithString:#"http://kyfbnewsroom.com/category/public-affairs/notifications/feed/"];
// Put that URL into an NSURLRequest
NSURLRequest *req = [NSURLRequest requestWithURL:url];
// Create a connection that will exchange this request for data from the URL
connection = [[NSURLConnection alloc]initWithRequest:req delegate:self startImmediately:YES];
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self)
{
[self fetchEntries];
}
return self;
}
// This method will be called several times as the data arrives
- (void)connection:(NSURLConnection *)conn didReceiveData:(NSData *)data
{
// Add the incoming chunk of data to the container we are keeping
// The data always comes in the correct order
[xmlData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)conn
{
/* We are just checking to make sure we are getting the XML
NSString *xmlCheck = [[NSString alloc]initWithData:xmlData encoding:NSUTF8StringEncoding];
NSLog(#"xmlCheck = %#", xmlCheck);*/
[SVProgressHUD dismiss];
// Create the parser object with the data received from the web service
NSXMLParser *parser = [[NSXMLParser alloc]initWithData:xmlData];
[parser setDelegate:self];
[parser parse];
// Get rid of the XML data as we no longer need it
xmlData = nil;
// Reload the table.. for now, the table will be empty
NSMutableArray *notActionAlerts = [NSMutableArray array];
for (RSSItem *object in channel.items) {
if (!object.isActionAlert) {
[notActionAlerts addObject:object];
}
}
for (RSSItem *object in notActionAlerts) {
[channel.items removeObject:object];
}
[[self tableView]reloadData];
NSLog(#"%#\n %#\n %#\n", channel, [channel title], [channel infoString]);
}
- (void)connection:(NSURLConnection *)conn didFailWithError:(NSError *)error
{
// Release the connection object, we're done with it
connection = nil;
// Release the xmlData object, we're done with it
xmlData = nil;
[SVProgressHUD dismiss];
// Grab the description of the error object passed to us
NSString *errorString = [NSString stringWithFormat:#"Fetch failed: %#", [error localizedDescription]];
// Create and show an alert view with this error displayed
UIAlertView *av = [[UIAlertView alloc]initWithTitle:#"Error" message:errorString delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[av show];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[[webViewController webView]loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"about:blank"]]];
// Push the web view controller onto the navigation stack - this implicitly creates the web view controller's view the first time through
// [[self navigationController]pushViewController:webViewController animated:YES];
[self.navigationController pushViewController:webViewController animated:YES];
// Grab the selected item
RSSItem *entry = [[channel items]objectAtIndex:[indexPath row]];
// Construct a URL with the link string of the item
NSURL *url = [NSURL URLWithString:[entry link]];
// Construct a request object with that URL
NSURLRequest *req = [NSURLRequest requestWithURL:url];
// Load the request into the web view
[[webViewController webView]loadRequest:req];
webViewController.hackyURL = url;
// Set the title of the web view controller's navigation item
// [[webViewController navigationItem]setTitle:[entry title]];
}
#end

Answer 1

If you're using storyboard for that you have native support for pull-to-refresh.
Only change Refreshing to enabled and then you can hook up an action for this event.