Question

我是iphone开发的新手。我正在尝试对NSMutable数组进行排序，并参考保存为键“pubDate”的对象的日期。解析url后，我将日期格式保存在数组中“myPubDate”。

 (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
//NSLog(@"found characters: %@", string);
// save the characters for the current item...
if ([currentElement isEqualToString:@"title"]) {
    [currentTitle appendString:string];
} else if ([currentElement isEqualToString:@"link"]) {
    [currentLink appendString:string];
} else if ([currentElement isEqualToString:@"description"]) {
    [currentSummary appendString:string];
} else if ([currentElement isEqualToString:@"pubDate"]) {
    [currentDate appendString:string];
    NSDateFormatter *df =[[NSDateFormatter alloc] init];
    [df setFormatterBehavior:NSDateFormatterBehavior10_4];
    [df setDateFormat:@"EEE, dd MMM yyyy"];
    myPubDate = [df dateFromString:currentDate];

}


  - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{     
//NSLog(@"ended element: %@", elementName);
if ([elementName isEqualToString:@"item"]) {
        [item setObject:currentTitle forKey:@"title"];
            [item setObject:currentLink forKey:@"link"];
            [item setObject:currentSummary forKey:@"description"];
            [item setObject:myPubDateforKey:@"pubDate"] 

            [item setObject:currentImage forKey:@"imagePath"];
            NSLog(@"Befor if condition");
            [stories addObject:[item copy]];
        }
                        recent = [stories copy];}

 For sorting
    NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"pubDate" ascending:NO]; 
    [recent sortUsingDescriptor:[NSArray arrayWithObjects:descriptor, nil]];  
 recent1 = [recent sortedArrayUsingDescriptors:descriptor];
[descriptor release];

我在控制台中将错误称为

[NSCFArray sortUsingDescriptor：]：无法识别的选择器发送到实例0x4ed10c0

我哪里出错了？请帮帮我。谢谢。

Answer 1

您的问题似乎是一个错字：sortUsingDescriptor:与sortUsingDescriptors:

不一样

如何避免无法识别的选择器发送到NSCFArray sortUsingDescriptor：在iPhone？

1 个答案: