I have an XML parser that uses RaptureXML to grab each item and display it within a table cell. I already can get the title and description, but I can't seem to work out how to get the date.
Here's what I have so far for the date:
NSString* dateString;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"EEEE MMMM d, YYYY"];
dateString = [formatter stringFromDate:self.pubDate];
[articleAbstract appendAttributedString:
[[NSAttributedString alloc] initWithString: dateString]
];
I keep getting this showing up in the debugger:
'NSInvalidArgumentException', reason: 'NSConcreteAttributedString initWithString:: nil value'
I don't know what I'm doing wrong. Here's the full code:
RSSItem.h
#import <Foundation/Foundation.h>
@interface RSSItem : NSObject
@property (strong, nonatomic) NSString* title;
@property (strong, nonatomic) NSString* description;
@property (strong, nonatomic) NSURL* link;
@property (strong, nonatomic) NSAttributedString* cellMessage;
@property (strong, nonatomic) NSDate* pubDate;
@property (strong, nonatomic) NSString* dateString;
@end
RSSItem.m
#import "RSSItem.h"
#import "GTMNSString+HTML.h"
@implementation RSSItem
-(NSAttributedString*)cellMessage
{ if (_cellMessage!=nil) return _cellMessage;
NSDictionary* boldStyle = @{NSFontAttributeName: [UIFont fontWithName:@"Helvetica-Bold" size:16.0]};
NSDictionary* normalStyle = @{NSFontAttributeName: [UIFont fontWithName:@"Helvetica" size:16.0]};
NSMutableAttributedString* articleAbstract = [[NSMutableAttributedString alloc] initWithString:self.title];
[articleAbstract setAttributes:boldStyle
range:NSMakeRange(0, self.title.length)];
[articleAbstract appendAttributedString:
[[NSAttributedString alloc] initWithString:@"\n\n"]
];
// Parse for date
NSString* dateString;
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setDateFormat:@"EEEE MMMM d, YYYY"];
dateString = [formatter stringFromDate:self.pubDate];
[articleAbstract appendAttributedString:
[[NSAttributedString alloc] initWithString: dateString]
];
[articleAbstract appendAttributedString:
[[NSAttributedString alloc] initWithString:@"\n\n"]
];
int startIndex = [articleAbstract length];
NSString* description = [NSString stringWithFormat:@"%@...", [self.description substringToIndex:100]];
description = [description gtm_stringByUnescapingFromHTML];
[articleAbstract appendAttributedString:
[[NSAttributedString alloc] initWithString: description]
];
[articleAbstract setAttributes:normalStyle
range:NSMakeRange(startIndex, articleAbstract.length - startIndex)];
_cellMessage = articleAbstract;
return _cellMessage;
}
@end
EDIT: Here is my RSS Loader
#import "RSSItem.h"
#define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
@implementation RSSLoader
-(void)fetchRssWithURL:(NSURL*)url complete:(RSSLoaderCompleteBlock)c
{
dispatch_async(kBgQueue, ^{
//work in the background
RXMLElement *rss = [RXMLElement elementFromURL: url];
RXMLElement* title = [[rss child:@"channel"] child:@"title"];
RXMLElement* pubDate = [[rss child:@"channel"] child:@"pubDate"];
NSString *usableDate = [pubDate];
NSArray* items = [[rss child:@"channel"] children:@"item"];
NSMutableArray* result = [NSMutableArray arrayWithCapacity:items.count];
//more code
for (RXMLElement *e in items) {
//iterate over the articles
RSSItem* item = [[RSSItem alloc] init];
item.title = [[e child:@"title"] text];
item.pubDate = usableDate
item.description = [[e child:@"description"] text];
item.link = [NSURL URLWithString: [[e child:@"link"] text]];
[result addObject: item];
}
c([title text], result);
});
}
Can someone please help me parse my date correctly?
Based on the code you added to your question, the problem has to do with how you set the pubDate
property. You defined the property to be an NSDate
but you set an NSString
value to the property in your RSS loader code.
You need to convert the string obtained from the XML file to an NSDate or change your pubDate
property from NSDate
to NSString
. If you do the latter then your earlier code needs to be updated to reflect this change.
The decision is really dependent on what you need to do with the date.