我正在创建基于RSS Feed的应用。我正在尝试解析图像链接。但我没有得到链接。代码如下 -
-(void) grabRSSFeed:(NSString *)blogAddress
{
// Autorelease pool for secondary threads
// NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
// Initialize the blogEntries MutableArray that we declared in the header
feedEntries = [[NSMutableArray alloc] init];
// Convert the supplied URL string into a usable URL object
NSURL *url = [NSURL URLWithString:blogAddress];
if(url==nil)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"RSS Feed" message:@"Please enter a valid RSS feed URL."
delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[alert show];
}
else
{
// Create a new rssParser object based on the TouchXML "CXMLDocument" class, this is the
// object that actually grabs and processes the RSS data
NSError *error;
CXMLDocument *rssParser = [[CXMLDocument alloc] initWithContentsOfURL:url options:0 error:&error];
if(rssParser==nil)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"RSS Feed" message:@"Please enter a valid RSS feed URL."
delegate:self cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[alert show];
}
else
{
// Create a new Array object to be used with the looping of the results from the rssParser
NSArray *resultNodes = NULL;
// Set the resultNodes Array to contain an object for every instance of an node in our RSS feed
resultNodes = [rssParser nodesForXPath:@"//item" error:nil];
// Loop through the resultNodes to access each items actual data
for (CXMLElement *resultElement in resultNodes) {
// Create a temporary MutableDictionary to store the items fields in, which will eventually end up in blogEntries
NSMutableDictionary *feedItem = [[NSMutableDictionary alloc] init];
// Create a counter variable as type "int"
int counter;
// Loop through the children of the current node
for(counter = 0; counter < [resultElement childCount]; counter++)
{
// Add each field to the blogItem Dictionary with the node name as key and node value as the value
if([[resultElement childAtIndex:counter] stringValue]!=nil)
[feedItem setObject:[[resultElement childAtIndex:counter] stringValue] forKey:[[resultElement childAtIndex:counter] name]];
}
// Add the blogItem to the global blogEntries Array so that the view can access it.
[feedEntries addObject:feedItem];
}
NSLog(@"Feeds = %@",feedEntries);
[feedEntries writeToFile:[[self applicationDocumentsDirectory] stringByAppendingPathComponent:@"Feeds.plist"] atomically:YES];
// [self performSelectorOnMainThread:@selector(reloadTableData:) withObject:nil waitUntilDone:NO];
}
}
}
如何获取有关特定新闻的图像链接？