detecting youtube video links programmatically in Objective-C - iphone

Question

I need to download and save videos from video sites like youtube. I want to save them to the video library of the iPhone. How can I detect the videos and save them to library? I already checked out some source codes available. This is what i have done in the download action, but is not working.
- (IBAction)download {
[downloadButton setEnabled:NO];
[webView setUserInteractionEnabled:NO];
UIUserInterfaceIdiom userInterfaceIdiom = [UIDevice currentDevice].userInterfaceIdiom;
NSString *getURL = #"";
if (userInterfaceIdiom == UIUserInterfaceIdiomPhone) {
getURL = [webView stringByEvaluatingJavaScriptFromString:#"function getURL() {var player = document.getElementById('player'); var video = player.getElementsByTagName('video')[0]; return video.getAttribute('src');} getURL();"];
} else {
getURL = [webView stringByEvaluatingJavaScriptFromString:#"function getURL() {var bh = document.getElementsByClassName('bh'); if (bh.length) {return bh[0].getAttribute('src');} else {var zq = document.getElementsByClassName('zq')[0]; return zq.getAttribute('src');}} getURL();"];
}
NSString *getTitle = [webView stringByEvaluatingJavaScriptFromString:#"function getTitle() {var jm = document.getElementsByClassName('jm'); if (jm.length) {return jm[0].innerHTML;} else {var lp = document.getElementsByClassName('lp')[0]; return lp.childNodes[0].innerHTML;}} getTitle();"];
NSString *getTitleFromChannel = [webView stringByEvaluatingJavaScriptFromString:#"function getTitleFromChannel() {var video_title = document.getElementById('video_title'); return video_title.childNodes[0].innerHTML;} getTitleFromChannel();"];
NSLog(#"%#, %#, %#", getURL, getTitle, getTitleFromChannel);
[webView setUserInteractionEnabled:YES];
NSArray *components = [getTitle componentsSeparatedByCharactersInSet:[[NSCharacterSet alphanumericCharacterSet] invertedSet]];
getTitle = [components componentsJoinedByString:#" "];
if ([getURL length] > 0) {
if ([getTitle length] > 0) {
videoTitle = [getTitle retain];
bar = [[UIDownloadBar alloc] initWithURL:[NSURL URLWithString:getURL]
progressBarFrame:CGRectMake(85.0, 17.0, 150.0, 11.0)
timeout:15
delegate:self];
[bar setProgressViewStyle:UIProgressViewStyleBar];
[toolbar addSubview:bar];
} else {
NSArray *components = [getTitleFromChannel componentsSeparatedByCharactersInSet:[[NSCharacterSet alphanumericCharacterSet] invertedSet]];
getTitleFromChannel = [components componentsJoinedByString:#" "];
if ([getTitleFromChannel length] > 0) {
videoTitle = [getTitleFromChannel retain];
bar = [[UIDownloadBar alloc] initWithURL:[NSURL URLWithString:getURL]
progressBarFrame:CGRectMake(85.0, 17.0, 150.0, 11.0)
timeout:15
delegate:self];
[bar setProgressViewStyle:UIProgressViewStyleBar];
[toolbar addSubview:bar];
} else {
//NSLog(#"%#", [webView stringByEvaluatingJavaScriptFromString:#"document.getElementsByTagName('html')[0].innerHTML;"]);
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"MyTube" message:#"Couldn't get video title." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alertView show];
[alertView release];
[downloadButton setEnabled:YES];
}
}
} else {
//NSLog(#"%#", [webView stringByEvaluatingJavaScriptFromString:#"document.getElementsByTagName('html')[0].innerHTML;"]);
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"MyTube" message:#"Couldn't get MP4 URL." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alertView show];
[alertView release];
[downloadButton setEnabled:YES];
}
}

Answer 1

This will grab the video ids if you are consistently expecting they to be in the < object > format.
Regex will obviously need to be changed if it's in an iframe.
NSError *error = nil;
NSRegularExpression *regex =
[NSRegularExpression regularExpressionWithPattern:#"<object .*name=\"movie\" value=\"[a-zA-z:\\/]*.com\\/\\w*\\/([A-Za-z0-9\\_-]*).*<\\/object>"
options:NSRegularExpressionCaseInsensitive
error:&error];
[regex enumerateMatchesInString:pageSource options:0 range:NSMakeRange(0, [string length]) usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags flags, BOOL *stop){
NSString *videoID = [pageSource substringWithRange:[match rangeAtIndex:1]];
}];

Answer 2

You can save downloaded videos either to photos album or to the app directory itself.For downloading videos u have to generate a downloadble link of the corresponding video.In the case of downloading videos from the site youtube,refer this source code https://github.com/comonitos/youtube_video. Some sites are download restricted ones that may not be possible.In the case of all other sites by generating the downloadable url,you can make it work