Youtube thumbnail from channel rss feed? - ios

Question

I am trying to load a youtube channel's feed into a uitableview with an rss feed. I need this to display the thumbnail from the individual videos. I can only find this using the gdata client which does not work. Here is the code I have so far:
Videos.h:
#import <UIKit/UIKit.h>
#interface Videos : UITableViewController<NSXMLParserelegate>{
IBOutlet UITableView * newsTable;
UIActivityIndicatorView * activityIndicator;
CGSize cellSize;
NSXMLParser * rssParser;
NSMutableArray * stories;
// a temporary item; added to the "stories" array one at a time, and cleared for the next one
NSMutableDictionary * item;
// it parses through the document, from top to bottom...
// we collect and cache each sub-element value, and then save each item to our array.
// we use these to track each current item, until it's ready to be added to the "stories" array
NSString * currentElement;
NSMutableString * currentTitle, * currentDate, * currentSummary, * currentLink;
}
- (void)parseXMLFileAtURL:(NSString *)URL;
#end
Videos.m
#import "Videos.h"
#import "AppDelegate.h"
#implementation Videos
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
self.tabBarItem.image = [UIImage imageNamed:#"clapboard#2x.png"];
}
return self;
}
- (void)viewDidLoad {
// Add the following line if you want the list to be editable
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [stories count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *MyIdentifier = #"MyIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:MyIdentifier];
}
// Set up the cell
int storyIndex = [indexPath indexAtPosition: [indexPath length] - 1];
cell.textLabel.text=[[stories objectAtIndex: storyIndex] objectForKey: #"title"];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Navigation logic
int storyIndex = [indexPath indexAtPosition: [indexPath length] - 1];
NSString * storyLink = [[stories objectAtIndex: storyIndex] objectForKey: #"link"];
NSLog(#"%#",stories );
// clean up the link - get rid of spaces, returns, and tabs...
storyLink = [storyLink stringByReplacingOccurrencesOfString:#" " withString:#""];
storyLink = [storyLink stringByReplacingOccurrencesOfString:#"\n" withString:#""];
storyLink = [storyLink stringByReplacingOccurrencesOfString:#" " withString:#""];
// open in Safari
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:storyLink]];
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
if ([stories count] == 0) {
NSString * path = #"https://youtube.com/rss/user/TheGruenebergBrother/videos.rss";
[self parseXMLFileAtURL:path];
}
cellSize = CGSizeMake([newsTable bounds].size.width, 60);
}
- (void)viewWillDisappear:(BOOL)animated {
}
- (void)viewDidDisappear:(BOOL)animated {
}
#pragma mark - parseing_Delegate_methods
- (void)parserDidStartDocument:(NSXMLParser *)parser{
NSLog(#"found file and started parsing");
}
- (void)parseXMLFileAtURL:(NSString *)URL
{
stories = [[NSMutableArray alloc] init];
//you must then convert the path to a proper NSURL or it won't work
NSURL *xmlURL = [NSURL URLWithString:URL];
// here, for some reason you have to use NSClassFromString when trying to alloc NSXMLParser, otherwise you will get an object not found error
// this may be necessary only for the toolchain
rssParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];
// Set self as the delegate of the parser so that it will receive the parser delegate methods callbacks.
[rssParser setDelegate:self];
// Depending on the XML document you're parsing, you may want to enable these features of NSXMLParser.
[rssParser setShouldProcessNamespaces:NO];
[rssParser setShouldReportNamespacePrefixes:NO];
[rssParser setShouldResolveExternalEntities:NO];
[rssParser parse];
}
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
NSString * errorString = [NSString stringWithFormat:#"Unable to download story feed from web site (Error code %i )", [parseError code]];
NSLog(#"error parsing XML: %#", errorString);
UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:#"Error loading content" message:errorString delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[errorAlert show];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
//NSLog(#"found this element: %#", elementName);
currentElement = [elementName copy];
if ([elementName isEqualToString:#"item"]) {
// clear out our story item caches...
item = [[NSMutableDictionary alloc] init];
currentTitle = [[NSMutableString alloc] init];
currentDate = [[NSMutableString alloc] init];
currentSummary = [[NSMutableString alloc] init];
currentLink = [[NSMutableString alloc] init];
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
//NSLog(#"ended element: %#", elementName);
if ([elementName isEqualToString:#"item"]) {
// save values to an item, then store that item into the array...
[item setObject:currentTitle forKey:#"title"];
[item setObject:currentLink forKey:#"link"];
[item setObject:currentSummary forKey:#"summary"];
[item setObject:currentDate forKey:#"date"];
[stories addObject:[item copy]];
NSLog(#"adding story: %#", currentTitle);
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
//NSLog(#"found characters: %#", string);
// save the characters for the current item...
if ([currentElement isEqualToString:#"title"]) {
[currentTitle appendString:string];
} else if ([currentElement isEqualToString:#"link"]) {
[currentLink appendString:string];
} else if ([currentElement isEqualToString:#"description"]) {
[currentSummary appendString:string];
} else if ([currentElement isEqualToString:#"pubDate"]) {
[currentDate appendString:string];
}
}
- (void)parserDidEndDocument:(NSXMLParser *)parser {
[activityIndicator stopAnimating];
[activityIndicator removeFromSuperview];
NSLog(#"all done!");
NSLog(#"stories array has %d items", [stories count]);
[newsTable reloadData];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning]; // Releases the view if it doesn't have a superview
// Release anything that's not essential, such as cached data
}
- (void)dealloc {
[currentElement release];
[rssParser release];
[stories release];
[item release];
[currentTitle release];
[currentDate release];
[currentSummary release];
[currentLink release];
[super dealloc];
}
#end
Also where should the code go, and what is the code?
Thanks

Answer 1

there is a thumbnail url,
http://img.youtube.com/vi/VIDEOIDHERE/0.jpg
http://img.youtube.com/vi/VIDEOIDHERE/1.jpg
http://img.youtube.com/vi/VIDEOIDHERE/2.jpg
http://img.youtube.com/vi/VIDEOIDHERE/3.jpg
will fetch you the thumbnail for any video. The number represents the quality, zero being the highest. E.g:
http://img.youtube.com/vi/F2Jko4Ipdrs/0.jpg