iPhone dev：尝试比较当前日期和数组元素的日期

发布于 2024-10-29 05:40:52 字数 1195 浏览 6 评论 0原文

我有一个带有部分的工作 UITable。 UITable 从外部 XML 文件获取数据，这也很好用。但我想要的是 XMLparser 排除日期早于今天的行。我想在我的文件向数组添加一个元素时执行此操作。但是当我添加此代码时出现错误。请帮我解决这个问题！

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
   NSDate* date = [NSDate date];
   NSDateFormatter* nsformatter = [[[NSDateFormatter alloc] init] autorelease];
   [nsformatter setDateFormat:@"yyyy-MM-dd"];
   NSDate* stageDate = [XMLParser dateFromString:aStage.end];

   if([elementName isEqualToString:@"Stages"])
   {
       return;
   }
   if([elementName isEqualToString:@"Month"])
   {
   [appDelegate.stages addObject:aMonth];
       [aMonth release];
   aMonth = nil;
   }
   if([elementName isEqualToString:@"Stage"])
   {
       /* THIS IS THE PART I ADDED BUT GIVES THE ERROR
       if(stageDate < date)
       {
       */
           [aMonth.stagesPerMonth addObject:aStage];
           [aStage release];
           aStage = nil;
       /*
       }
       */
   }
   else
   {
       [aStage setValue:currentElementValue forKey:elementName];
       [currentElementValue release];
       currentElementValue = nil;
   }
}

原文

I have a working UITable with sections. The UITable gets its data from an external XML file this also works good. But what I want is that the XMLparser excludes the rows where the date is older then today. I thought to do this at the moment where my file adds an element to my array. But when I add this code I get an error.
Please help me out on this one!

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
   NSDate* date = [NSDate date];
   NSDateFormatter* nsformatter = [[[NSDateFormatter alloc] init] autorelease];
   [nsformatter setDateFormat:@"yyyy-MM-dd"];
   NSDate* stageDate = [XMLParser dateFromString:aStage.end];

   if([elementName isEqualToString:@"Stages"])
   {
       return;
   }
   if([elementName isEqualToString:@"Month"])
   {
   [appDelegate.stages addObject:aMonth];
       [aMonth release];
   aMonth = nil;
   }
   if([elementName isEqualToString:@"Stage"])
   {
       /* THIS IS THE PART I ADDED BUT GIVES THE ERROR
       if(stageDate < date)
       {
       */
           [aMonth.stagesPerMonth addObject:aStage];
           [aStage release];
           aStage = nil;
       /*
       }
       */
   }
   else
   {
       [aStage setValue:currentElementValue forKey:elementName];
       [currentElementValue release];
       currentElementValue = nil;
   }
}

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大姐，你呐 2024-11-05 05:40:52

一个简单的方法是使用 NSDate 的 compare 方法：

NSComparisonResult result = [stageDate compare:aDate];  
if (result == NSOrderedAscending)     
    // stageDate is in the future
else if (result == NSOrderedDescending)     
    // stageDate is in the past
else     
    // Both dates are the same

A simple way is to use NSDate's compare method:

NSComparisonResult result = [stageDate compare:aDate];  
if (result == NSOrderedAscending)     
    // stageDate is in the future
else if (result == NSOrderedDescending)     
    // stageDate is in the past
else     
    // Both dates are the same

回复收藏 0 原文

转瞬即逝 2024-11-05 05:40:52

您以错误的方式比较日期。试试这个。

NSTimeInterval interval = [date timeIntervalSinceDate:stageDate];
if (interval > 0) {
    [aMonth.stagesPerMonth addObject:aStage];
    [aStage release];
    aStage = nil;
}

You are comparing the dates in wrong way. Try this.

NSTimeInterval interval = [date timeIntervalSinceDate:stageDate];
if (interval > 0) {
    [aMonth.stagesPerMonth addObject:aStage];
    [aStage release];
    aStage = nil;
}

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