//排序 对时间进行排序
   NSMutableArray *dataArray=[[NSMutableArray alloc]initWithCapacity:0];
    NSMutableDictionary *dir=[[NSMutableDictionary alloc]init];
    [dir setObject:@"2012-12-02" forKey:@"time"];
    [dataArray addObject:dir];
    [dir release];

    NSMutableDictionary *dir1=[[NSMutableDictionary alloc]init];
    [dir1 setObject:@"2012-02-15" forKey:@"time"];
    [dataArray addObject:dir1];
    [dir1 release];

    NSMutableDictionary *dir2=[[NSMutableDictionary alloc]init];
    [dir2 setObject:@"2012-03-02" forKey:@"time"];
    [dataArray addObject:dir2];
    [dir2 release];

    NSMutableDictionary *dir3=[[NSMutableDictionary alloc]init];
    [dir3 setObject:@"2000-03-02" forKey:@"time"];
    [dataArray addObject:dir3];
    [dir3 release];

    NSMutableDictionary *dir4=[[NSMutableDictionary alloc]init];
    [dir4 setObject:@"2112-03-02" forKey:@"time"];
    [dataArray addObject:dir4];
    [dir4 release];

    NSMutableArray *myArray=[[NSMutableArray alloc]initWithCapacity:0];
    [myArray addObjectsFromArray:dataArray];
    //[myArray release];
    [dataArray release];

    for (int i=0; i<[myArray count]; i++) {
        NSLog(@"排序前----->>%@",[[myArray objectAtIndex:i] objectForKey:@"time"]);
    }

    NSSortDescriptor*sorter=[[NSSortDescriptor alloc]initWithKey:@"time" ascending:YES];
    NSMutableArray *sortDescriptors=[[NSMutableArray alloc]initWithObjects:&sorter count:1];
    NSArray *sortArray=[myArray sortedArrayUsingDescriptors:sortDescriptors];
    [sorter release];

    for (int i=0; i<[sortArray count]; i++) {
        NSLog(@"排序后----->>%@",[[sortArray objectAtIndex:i] objectForKey:@"time"]);
    }

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