Twitter search API supports both JSON and Atom (XML). JSON would be easiest to work with though (using JSON framework).
I'm assuming you just want to pull in a search feed for a hashtag. I'd point you to the Twitter API (which you should investigate), but since your needs are quite basic, the API call would be along the lines of:
http://search.twitter.com/search.json?q=%23iphone (note the url encoded #)
Here's a very simple example that will fetch the search feed for #iphone and print out the tweets using JSON:
Code:
NSString *jString = [[NSString alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://search.twitter.com/search.json?q=%23iphone"]];
NSArray *tweets = [[jString JSONValue] objectForKey:@"results"];
for (NSDictionary *tweet in tweets) {
NSLog(@"%@: %@", [tweet objectForKey:@"from_user"], [tweet objectForKey:@"text"]);
//prints user: tweet
}
[jString release];
With regards to dealing with RSS parsing, there are plenty of examples for XML parsing around. Give it a go and post specific problems you encounter. It's a bit consuming to try and explain it when there are great resources already around (a quick forum search here will probably give you some useful threads). You don't necessarily have to use TouchXML. Built in NSXMLParser should be plenty fine and you'll find more examples and documentation using that.
Pull posts from Twitter hashtag into app?
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