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Parsing XML
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Figure 14.3 RSS feeds can easily be placed in table views.
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whichever RSS feeds they want to read. But for the purposes of this example, create an XML settings file called rssfeeds.xml by hand, using the following format:
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<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns="http://purl.org/rss/1.0/" xmlns:dc="http://purl.org/dc/elements/1.1/"> <feed title="RPGnet News" url="http://www.rpg.net/index.xml" /> <feed title="RPGnet Columns" url="http://www.rpg.net/columns/index.xml" /> </rdf:RDF>
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For each entry, create a singular <feed> element and include title and url attributes. After you ve added rssfeeds.xml to your project, you re ready to write the code for the top-level table, which will parse your local XML file and give your user the option to select one of the RSS feeds. Listing 14.3 displays this code, which appears in the main view controller.
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Listing 14.3 Reading an XML text file
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- (void)viewDidLoad { Parses [super viewDidLoad]; XML file self.title = @"RSS Feeds"; rssList = [[NSMutableArray alloc] initWithCapacity:1]; NSString *paths = [[NSBundle mainBundle] resourcePath]; NSString *xmlFile = [paths
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stringByAppendingPathComponent:@"rssfeeds.xml"]; NSURL *xmlURL = [NSURL fileURLWithPath:xmlFile isDirectory:NO]; NSXMLParser *firstParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL]; [firstParser setDelegate:self]; [firstParser parse]; } Reads attribute - (void)parser:(NSXMLParser *)parser elements didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict { if ([elementName compare:@"feed"] == NSOrderedSame) { [rssList addObject:[[NSDictionary alloc] initWithObjectsAndKeys: [attributeDict objectForKey:@"title"],@"title", [attributeDict objectForKey:@"url"],@"url", nil]]; } Cleans up } parser - (void)parserDidEndDocument:(NSXMLParser *)parser { [parser release]; } - (NSInteger)numberOfSectionsInTableView: (UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [rssList count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease]; } cell.textLabel.text = [[rssList objectAtIndex:indexPath.row] objectForKey:@"title"]; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; return cell; } Calls up - (void)tableView:(UITableView *)tableView RSS view didSelectRowAtIndexPath:(NSIndexPath *)indexPath { rssViewController *nextController = [[rssViewController alloc] initWithURL: [[rssList objectAtIndex:indexPath.row] objectForKey:@"url"]]; nextController.title = [[rssList objectAtIndex:indexPath.row] objectForKey:@"title"]; [self.navigationController pushViewController:nextController animated:YES]; [nextController release]; }
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Parsing XML
This example begins by reading in XML from a file B. The result is a lot more pleasing than trying to read raw text, as in the thumbnail example earlier in this chapter, so we suggest encoding simple preference files as XML in the future. Because we designed a simple XML format, where the information is encoded as attributes, you have to watch only one delegate method, didStartElement: C. Here you add the information to rssList, an NSMutableArray, for use later. The only other thing you have to do with your XML parser is clean it up when you ve finished D. The next few functions are standard table view work, because you define the sections, rows, and cells using the rssList array you created. Finally, you define what happens when the user selects a row E, and that s to call up a brand-new type of object, the rssViewController.
THE RSS TABLE
The rssViewController is a subclass of the UITableViewController that displays an RSS feed if initialized with a URL. Listing 14.4 shows the complete contents, much of which are similar to listing 14.3. The biggest differences are in the XML parsing, because an RSS feed is a much more complicated XML format, even when you re using only minimal information from it, as is the case here.
Listing 14.4 Creating a table from an RSS feed
- (id)initWithURL:(NSString *)url { Parses if (self = [super init]) { RSS feed feedList = [[NSMutableArray alloc] initWithCapacity:0]; NSXMLParser *nextParser = [[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:url]]; [nextParser setDelegate:self]; [nextParser parse]; } return self; } - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict { if ([elementName compare:@"item"] == NSOrderedSame) { currentItem = [[NSMutableDictionary alloc] initWithCapacity:0]; } else if (currentItem != NULL) { currentContents = [[NSMutableString alloc] initWithCapacity:0]; } } Reads - (void)parser:(NSXMLParser *)parser content foundCharacters:(NSString *)string { if (currentContents && string) { [currentContents appendString:string]; } } Finishes - (void)parser:(NSXMLParser *)parser reading didEndElement:(NSString *)elementName
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namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { if ([elementName compare:@"item"] == NSOrderedSame) { [feedList addObject:currentItem]; [currentItem release]; } else if (currentItem && currentContents) { [currentItem setObject:currentContents forKey:elementName]; currentContents = nil; [currentContents release]; } } - (void)parserDidEndDocument:(NSXMLParser *)parser { [parser release]; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [feedList count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease]; } if ([[feedList objectAtIndex:indexPath.row] objectForKey:@"title"]) { cell.textLabel.text = [[feedList objectAtIndex:indexPath.row] objectForKey:@"title"]; } if ([[feedList objectAtIndex:indexPath.row] objectForKey:@"link"]) { cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; } return cell; } Calls up - (void)tableView:(UITableView *)tableView web view didSelectRowAtIndexPath:(NSIndexPath *)indexPath { UIWebView *thisInfo = [[UIWebView alloc] init]; [thisInfo loadRequest:[NSURLRequest requestWithURL: [NSURL URLWithString:[[feedList objectAtIndex:indexPath.row] objectForKey:@"link"]]]]; thisInfo.scalesPageToFit = YES; UIViewController *thisVC = [[UIViewController alloc] init]; thisVC.view = thisInfo; thisVC.title = [[feedList objectAtIndex:indexPath.row] objectForKey:@"title"]; [self.navigationController pushViewController:thisVC animated:YES]; [thisInfo release]; [thisVC release]; }
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