在iPhone中按日期格式排序 [英] Sorting by date format in iphone

问题描述

我是iphone开发的新手。我正在排序一个可变数组相对于date.But它是排序使用date参数认为它是字符串。我想按日期排序。我如何实现那个。请帮助我出去了。

  NSSortDescriptor * descriptor = [[NSSortDescriptor alloc] initWithKey：@pubDateascending：YES] 
 [stories sortUsingDescriptors：[NSArray arrayWithObjects：descriptor，nil]]; 
  

我可以使用选择器吗？如果是这样，我应该怎么用？谢谢。

解决方案

   - （void） （NSXMLParser *）解析器foundCharacters：（NSString *）string 
 {
 [dateString appendString：string]; （NSString *）nameName namespaceURI（NSString *）namespaceURI qualifiedName :( NSString *）qName {
} $（$）
 $ NSDateFormatter * df = [[[NSDateFormatter alloc] init] autorelease]; 
 [df setDateFormat：@dd.MM.yyyy]; //如果以不同的方式使用格式，请更改格式
 NSDate * myDate = [df dateFromString：dateString]; 
 [dateArray addObject：myDate];之后，您可以使用您所述的方式对数组进行排序。 
 
I am new to iphone development.I am sorting a mutable array with respect to date.But it is sorting Using the date parameter consider it as string.I want to sort it by date.How can i achieve that .Please help me out.
 NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"pubDate" ascending:YES];
[stories sortUsingDescriptors:[NSArray arrayWithObjects:descriptor,nil]];
Can i use selectors? if so how should i use it?.Thanks.
解决方案
-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{ 
    [dateString appendString:string];
}    

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{  
  NSDateFormatter *df = [[[NSDateFormatter alloc] init]autorelease];
  [df setDateFormat:@"dd.MM.yyyy"]; //change the format if you are using it in different way
  NSDate *myDate = [df dateFromString: dateString];
  [dateArray addObject:myDate];
}
after that you can sort the array just using the way you wrote in question.

                        
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