我正在研究RSSFeed项目。我想从五个不同的网址XML中获取数据。
1）http://rss.news.yahoo.com/rss/world - Yahoo.com
2）http://news.google.com/news?pz=1&ned=us&hl=en&topic=w&output=rss - Google.com
3）http://rssfeeds.usatoday.com/UsatodaycomWorld-TopStories - 今日美国
我可以使用
获取标题和描述等数据 Object for key @"Ttile"和Object for key "@PUBDATE"
但是在图像方面，所有使用不同键的RSS Feed都适用于图像
Object for key @"image"，Object for key @"src"，Object for key @"Media:content"
我可以使用Objectforkey:@"media:content"获取少量图片
但其他链接使用不同的Objectforkey，如@＆＃34; image＆＃34;或@＆＃34;媒体：缩略图＆＃34;。
我如何获取这个不同的密钥或如何在单个tableview中设置它？
我正在使用MWFeedParser进行XML解析。
以下是我可以使用objectforkey:@"Media:content"获取图片的代码，但我无法理解如何为图片设置其他按键。
//MWFeeditem.h
#import <Foundation/Foundation.h>
@interface MWFeedItem : NSObject <NSCoding> {
NSString *identifier; // Item identifier
NSString *title; // Item title
NSString *link; // Item URL
NSDate *date; // Date the item was published
NSDate *updated; // Date the item was updated if available
NSString *summary; // Description of item
NSString *content; // More detailed content (if available)
NSString *author; // Item author
NSString *image; // image for the feed
// Enclosures: Holds 1 or more item enclosures (i.e. podcasts, mp3. pdf, etc)
// - NSArray of NSDictionaries with the following keys:
// url: where the enclosure is located (NSString)
// length: how big it is in bytes (NSNumber)
// type: what its type is, a standard MIME type (NSString)
NSArray *enclosures;
}
@property (nonatomic, copy) NSString *identifier;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *link;
@property (nonatomic, copy) NSDate *date;
@property (nonatomic, copy) NSDate *updated;
@property (nonatomic, copy) NSString *summary;
@property (nonatomic, copy) NSString *content;
@property (nonatomic, copy) NSString *author;
@property (nonatomic, copy) NSArray *enclosures;
@property (nonatomic, copy) NSString *image;
@end
// MWFeeditem.m
#pragma mark NSCoding
- (id)initWithCoder:(NSCoder *)decoder {
if ((self = [super init])) {
identifier = [decoder decodeObjectForKey:@"identifier"];
title = [decoder decodeObjectForKey:@"title"];
link = [decoder decodeObjectForKey:@"link"];
date = [decoder decodeObjectForKey:@"date"];
updated = [decoder decodeObjectForKey:@"updated"];
summary = [decoder decodeObjectForKey:@"summary"];
content = [decoder decodeObjectForKey:@"content"];
author = [decoder decodeObjectForKey:@"author"];
enclosures = [decoder decodeObjectForKey:@"enclosures"];
image = [decoder decodeObjectForKey:@"media:content"];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)encoder {
if (identifier) [encoder encodeObject:identifier forKey:@"identifier"];
if (title) [encoder encodeObject:title forKey:@"title"];
if (link) [encoder encodeObject:link forKey:@"link"];
if (date) [encoder encodeObject:date forKey:@"date"];
if (updated) [encoder encodeObject:updated forKey:@"updated"];
if (summary) [encoder encodeObject:summary forKey:@"summary"];
if (content) [encoder encodeObject:content forKey:@"content"];
if (author) [encoder encodeObject:author forKey:@"author"];
if (enclosures) [encoder encodeObject:enclosures forKey:@"enclosures"];
if (image) [encoder encodeObject:image forKey:@"media:content"];
}
@end
// MWFwwsparser.m
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
MWXMLLog(@"NSXMLParser: didEndElement: %@", qName);
@autoreleasepool {
// Parse content as structure (Atom feeds with element type="xhtml")
// - Use elementName not qualifiedName to ignore XML namespaces for XHTML entities
if (parseStructureAsContent) {
// Check for finishing parsing structure as content
if (currentPath.length > pathOfElementWithXHTMLType.length) {
// Close XHTML tag unless it is an empty element
if (!ELEMENT_IS_EMPTY(elementName)) [currentText appendFormat:@"</%@>", elementName];
// Adjust path & don't continue
self.currentPath = [currentPath stringByDeletingLastPathComponent];
// Return
return;
}
// Finish
parseStructureAsContent = NO;
self.pathOfElementWithXHTMLType = nil;
// Continue...
}
// Store data
BOOL processed = NO;
if (currentText) {
// Remove newlines and whitespace from currentText
NSString *processedText = [currentText stringByRemovingNewLinesAndWhitespace];
// Process
switch (feedType) {
case FeedTypeRSS: {
// Specifications
// http://cyber.law.harvard.edu/rss/index.html
// http://web.resource.org/rss/1.0/modules/dc/ Dublin core also seems to be used for RSS 2 as well
// Item
if (!processed) {
if ([currentPath isEqualToString:@"/rss/channel/item/title"]) { if (processedText.length > 0) item.title = processedText; processed = YES; }
else if ([currentPath isEqualToString:@"/rss/channel/item/link"]) { if (processedText.length > 0) item.link = processedText; processed = YES; }
else if ([currentPath isEqualToString:@"/rss/channel/item/author"]) { if (processedText.length > 0) item.author = processedText; processed = YES; }
else if ([currentPath isEqualToString:@"/rss/channel/item/dc:creator"]) { if (processedText.length > 0) item.author = processedText; processed = YES; }
else if ([currentPath isEqualToString:@"/rss/channel/item/guid"]) { if (processedText.length > 0) item.identifier = processedText; processed = YES; }
else if ([currentPath isEqualToString:@"/rss/channel/item/description"]) { if (processedText.length > 0) item.summary = processedText; processed = YES; }
else if ([currentPath isEqualToString:@"/rss/channel/item/content:encoded"]) { if (processedText.length > 0) item.content = processedText; processed = YES; }
else if ([currentPath isEqualToString:@"/rss/channel/item/pubDate"]) { if (processedText.length > 0) item.date = [NSDate dateFromInternetDateTimeString:processedText formatHint:DateFormatHintRFC822]; processed = YES; }
else if ([currentPath isEqualToString:@"/rss/channel/item/enclosure"]) { [self createEnclosureFromAttributes:currentElementAttributes andAddToItem:item]; processed = YES; }
else if ([currentPath isEqualToString:@"/rss/channel/item/dc:date"]) { if (processedText.length > 0) item.date = [NSDate dateFromInternetDateTimeString:processedText formatHint:DateFormatHintRFC3339]; processed = YES; }
***// Changes Done here for image //***
else if ([currentPath isEqualToString:@"/rss/channel/item/media:content"])
{
if ([self.currentElementAttributes objectForKey:@"url"])
item.image = self.currentElementAttributes[@"url"];
processed = YES; }
}
这是我的UITableview方法，我必须在单元格中设置图像。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *MainTableIdentifier = @"MainTableIdentifier";
MainViewTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MainTableIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"MainViewTableViewCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
MWFeedItem *item = [itemsToDisplay objectAtIndex:indexPath.row];
if (item) {
// Process
NSString *itemTitle = item.title ? [item.title stringByConvertingHTMLToPlainText] : @"[No Title]";
NSString *itemSummary = item.summary ? [item.summary stringByConvertingHTMLToPlainText] : @"[No Summary]";
cell.lblTitle.text = itemTitle;
NSMutableString *subtitle = [NSMutableString string];
if (item.date) [subtitle appendFormat:@"%@ ", [formatter stringFromDate:item.date]];
//[subtitle appendString:itemSummary];
cell.lblDateTime.text = subtitle;
cell.lblDescription.text=itemSummary;
}
NSURL *url = [NSURL URLWithString:item.image];
[cell.ImgMainView sd_setImageWithURL:url];
更多参考资料在这里，我附上了Pastie.org链接的完整代码。
MWFeed解析器的类文件包含更改
应用程序的类文件。