我的应用程序使用 RSS 提要在表格视图中使用提要中的文章标题填充单元格。我正在尝试将每篇文章的发布日期添加到相应的单元格，但它没有显示出来。标题在 textLabel 中显示得很好，但在 detailTextLabel 中没有显示日期。我有一个显示所有 pubDate 项目的 NSLog 和一个显示所选行的 pubDate 的 didSelectRowAtIndexPath 中的 NSLog。有什么帮助吗？
RSS频道.m
#import "RSSChannel.h"
#import "RSSItem.h"
@implementation RSSChannel
@synthesize items, title, infoString, parentParserDelegate, date;
- (id)init
{
self = [super init];
if (self)
{
// Create the container for the RSSItems this channel has
items = [[NSMutableArray alloc]init];
}
return self;
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
NSLog(@"\t%@ found a %@ element", self, elementName);
if ([elementName isEqual:@"title"])
{
currentString = [[NSMutableString alloc]init];
[self setTitle:currentString];
}
else if ([elementName isEqual:@"pubDate"])
{
currentString = [[NSMutableString alloc]init];
[self setDate:currentString];
}
else if ([elementName isEqual:@"description"])
{
currentString = [[NSMutableString alloc]init];
[self setInfoString:currentString];
}
else if ([elementName isEqual:@"item"])
{
RSSItem *entry = [[RSSItem alloc]init];
// Set up its parent as ourselves so we can regain control of the parser
[entry setParentParserDelegate:self];
// Turn the parser to the RSSItem
[parser setDelegate:entry];
[items addObject:entry];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)str
{
[currentString appendString:str];
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
currentString = nil;
if ([elementName isEqual:@"channel"])
{
[parser setDelegate:parentParserDelegate];
}
}
@end
RSSItem.m
#import "RSSItem.h"
@implementation RSSItem
@synthesize title, link, date, isActionAlert, parentParserDelegate;
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
NSLog(@"\t\t%@ found a %@ element", self, elementName);
if ([elementName isEqualToString:@"category"]) {
NSLog(@"category");
}
if ([elementName isEqual:@"title"])
{
currentString = [[NSMutableString alloc]init];
[self setTitle:currentString];
}
else if ([elementName isEqual:@"link"])
{
currentString = [[NSMutableString alloc]init];
[self setLink:currentString];
}
else if ([elementName isEqual:@"pubDate"])
{
currentString = [[NSMutableString alloc]init];
[self setDate:currentString];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)str
{
if ([str isEqualToString:@"Action Alert"]) {
isActionAlert = YES;
}
[currentString appendString:str];
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
currentString = nil;
if ([elementName isEqual:@"item"])
{
[parser setDelegate:parentParserDelegate];
}
}
@end
表视图控制器
#import "AgStoriesViewController.h"
#import "RSSChannel.h"
#import "RSSItem.h"
#import "WebViewController.h"
// #import "CustomCellBackground.h"
#import "DTCustomColoredAccessory.h"
@implementation AgStoriesViewController
{
UIActivityIndicatorView *loadingIndicator;
}
@synthesize webViewController;
- (void)viewDidLoad
{
UIImageView *background = [[UIImageView alloc]init];
background.image = [UIImage imageNamed:@"plain_app-background.png"];
CGFloat width = CGRectGetWidth(self.view.bounds);
CGFloat height = CGRectGetHeight(self.view.bounds);
self.tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStyleGrouped];
[self.tableView setBackgroundView:background];
self.title = @"Ag News";
loadingIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
loadingIndicator.center = CGPointMake(width/2, height/2);
loadingIndicator.hidesWhenStopped = YES;
[self.view addSubview:loadingIndicator];
[loadingIndicator startAnimating];
// UIRefreshControl *refresh = [[UIRefreshControl alloc] init];
// refresh.attributedTitle = [[NSAttributedString alloc] initWithString:@"Pull to Refresh"];
// [refresh addTarget:self action:@selector(refreshView:)forControlEvents:UIControlEventValueChanged];
// self.refreshControl = refresh;
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
NSLog(@"%@ found a %@ element", self, elementName);
if ([elementName isEqual:@"channel"])
{
// If the parser saw a channel, create new instance, store in our ivar
channel = [[RSSChannel alloc]init];
// Give the channel object a pointer back to ourselves for later
[channel setParentParserDelegate:self];
// Set the parser's delegate to the channel object
[parser setDelegate:channel];
}
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// return 0;
NSLog(@"channel items %d", [[channel items]count]);
return [[channel items]count];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 50;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
// return nil;
UIImageView *image = [[UIImageView alloc]init];
image.image = [UIImage imageNamed:@"CellImage.png"];
UIImageView *background = [[UIImageView alloc]init];
background.image = [UIImage imageNamed:@"plain_app-background.png"];
UIImageView *highlightedCellImage = [[UIImageView alloc]init];
highlightedCellImage.image = [UIImage imageNamed:@"HighlightedCellImage"];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"UITableViewCell"];
if (cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"UITableViewCell"];
cell.textLabel.font=[UIFont systemFontOfSize:16.0];
}
RSSItem *item = [[channel items]objectAtIndex:[indexPath row]];
[[cell textLabel]setText:[item title]];
[[cell detailTextLabel]setText:[item date]];
NSLog(@"Date: %@", [item date]);
tableView.backgroundColor = [UIColor clearColor];
// cell.backgroundView = [[CustomCellBackground alloc] init];
// cell.selectedBackgroundView = [[CustomCellBackground alloc] init];
cell.textLabel.backgroundColor = [UIColor clearColor];
cell.textLabel.highlightedTextColor = [UIColor blueColor];
cell.textLabel.font = [UIFont fontWithName:@"FranklinGothicStd-ExtraCond" size:20.0];
cell.textLabel.textColor = [UIColor whiteColor];
cell.detailTextLabel.backgroundColor = [UIColor clearColor];
cell.detailTextLabel.highlightedTextColor = [UIColor blueColor];
cell.detailTextLabel.font = [UIFont fontWithName:@"FranklinGothicStd-ExtraCond" size:16.0];
cell.detailTextLabel.textColor = [UIColor whiteColor];
cell.backgroundView = image;
cell.selectedBackgroundView = highlightedCellImage;
tableView.backgroundView = background;
DTCustomColoredAccessory *accessory = [DTCustomColoredAccessory accessoryWithColor:cell.textLabel.textColor];
accessory.highlightedColor = [UIColor blueColor];
cell.accessoryView =accessory;
return cell;
}
- (void)fetchEntries
{
// Create a new data container for the stuff that comes back from the service
xmlData = [[NSMutableData alloc]init];
// Construct a URL that will ask the service for what you want -
// note we can concatenate literal strings together on multiple lines in this way - this results in a single NSString instance
NSURL *url = [NSURL URLWithString:@"http://kyfbnewsroom.com/category/ag-news/feed"];
// Put that URL into an NSURLRequest
NSURLRequest *req = [NSURLRequest requestWithURL:url];
// Create a connection that will exchange this request for data from the URL
connection = [[NSURLConnection alloc]initWithRequest:req delegate:self startImmediately:YES];
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self)
{
[self fetchEntries];
}
return self;
}
// This method will be called several times as the data arrives
- (void)connection:(NSURLConnection *)conn didReceiveData:(NSData *)data
{
// Add the incoming chunk of data to the container we are keeping
// The data always comes in the correct order
[xmlData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)conn
{
/* We are just checking to make sure we are getting the XML
NSString *xmlCheck = [[NSString alloc]initWithData:xmlData encoding:NSUTF8StringEncoding];
NSLog(@"xmlCheck = %@", xmlCheck);*/
[loadingIndicator stopAnimating];
// Create the parser object with the data received from the web service
NSXMLParser *parser = [[NSXMLParser alloc]initWithData:xmlData];
// Give it a delegate
[parser setDelegate:self];
//Tell it to start parsing - the document will be parsed and the delegate of NSXMLParser will get all of its delegate messages sent to it before this line finishes execution - it is blocking
[parser parse];
// Get rid of the XML data as we no longer need it
xmlData = nil;
// Reload the table.. for now, the table will be empty
[[self tableView]reloadData];
NSLog(@"%@\n %@\n %@\n", channel, [channel title], [channel infoString]);
}
- (void)connection:(NSURLConnection *)conn didFailWithError:(NSError *)error
{
// Release the connection object, we're done with it
connection = nil;
// Release the xmlData object, we're done with it
xmlData = nil;
// Grab the description of the error object passed to us
NSString *errorString = [NSString stringWithFormat:@"Fetch failed: %@", [error localizedDescription]];
// Create and show an alert view with this error displayed
UIAlertView *av = [[UIAlertView alloc]initWithTitle:@"Error" message:errorString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[av show];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Push the web view controller onto the navigation stack - this implicitly creates the web view controller's view the first time through
// [[self navigationController]pushViewController:webViewController animated:YES];
[self.navigationController pushViewController:webViewController animated:NO];
// Grab the selected item
RSSItem *entry = [[channel items]objectAtIndex:[indexPath row]];
NSLog(@"Channel Items: %@", [[channel items]objectAtIndex:[indexPath row]]);
// Construct a URL with the link string of the item
NSURL *url = [NSURL URLWithString:[entry link]];
NSLog(@"Link: %@", [entry link]);
// Construct a request object with that URL
NSURLRequest *req = [NSURLRequest requestWithURL:url];
NSLog(@"URL: %@", url);
// Load the request into the web view
[[webViewController webView]loadRequest:req];
webViewController.hackyURL = url;
NSLog(@"Request: %@", req);
// Set the title of the web view controller's navigation item
// [[webViewController navigationItem]setTitle:[entry title]];
NSLog(@"Title: %@", [entry title]);
NSLog(@"Pub Date: %@", [entry date]);
}
@end