对 NSDate 进行排序

发布于 2024-12-15 15:07:14 字数 737 浏览 1 评论 0原文

我的程序中有几个字典，我已将所有这些字典放入一个数组中，我想对这些日期进行相应排序，字典应该交换其位置，下面显示的是我正在使用的代码，但我没有对其进行排序。请帮助我解决这个问题

**NSLog(@"排序前---%d",[allDataArray count]);

for(int i=0;i<[allDataArray count]-1;i++){
    NSString *dateStr1=[[allDataArray objectAtIndex:i]objectForKey:@"Date"];
    for(int j=i+1;j<[allDataArray count];j++){
        NSString *dateStr2=[[allDataArray objectAtIndex:j]objectForKey:@"Date"];
        if(([(NSDate*)dateStr1 compare:(NSDate*)dateStr2]==NSOrderedAscending)
           ||([(NSDate*)dateStr1 compare:(NSDate*)dateStr2]==NSOrderedSame))
            [allDataArray replaceObjectAtIndex:i withObject:[allDataArray objectAtIndex:j]];
    }
}
   NSLog(@"afterSorting-numbers--%@",allDataArray);**

原文

i have several dictionaries in my program,i have put all those dictionaries in an array i want to sort those dates accordingly dictionary should exchange its position,below shown is the code i am using,but i am not getting it sorted.Please help me to fix this issue

**NSLog(@"before sorting---%d",[allDataArray count]);

for(int i=0;i<[allDataArray count]-1;i++){
    NSString *dateStr1=[[allDataArray objectAtIndex:i]objectForKey:@"Date"];
    for(int j=i+1;j<[allDataArray count];j++){
        NSString *dateStr2=[[allDataArray objectAtIndex:j]objectForKey:@"Date"];
        if(([(NSDate*)dateStr1 compare:(NSDate*)dateStr2]==NSOrderedAscending)
           ||([(NSDate*)dateStr1 compare:(NSDate*)dateStr2]==NSOrderedSame))
            [allDataArray replaceObjectAtIndex:i withObject:[allDataArray objectAtIndex:j]];
    }
}
   NSLog(@"afterSorting-numbers--%@",allDataArray);**

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

月下客 2024-12-22 15:07:14

看起来你正在重新发明轮子（排序已经在几十年前解决），改为这样做：

NSArray *allDataArray = ...;
NSArray *sortedAllDataArray = [allDataArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"Date" ascending:YES]]];

或者这样：

NSArray *allDataArray = ...;
NSArray *sortedAllDataArray = [allDataArray sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *dict1, NSDictionary *dict2) {
    return [[dict1 objectForKey:@"Date"] compare:[dict2 objectForKey:@"Date"]];
}]

Looks like you're reinventing the wheel here (sorting has been solves decades ago), do this instead:

NSArray *allDataArray = ...;
NSArray *sortedAllDataArray = [allDataArray sortedArrayUsingDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"Date" ascending:YES]]];

or this:

NSArray *allDataArray = ...;
NSArray *sortedAllDataArray = [allDataArray sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *dict1, NSDictionary *dict2) {
    return [[dict1 objectForKey:@"Date"] compare:[dict2 objectForKey:@"Date"]];
}]

回复收藏 0 原文

~没有更多了~