數組排序

NSArray *temp;
    [temp sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
    NSDictionary *temp1 = obj1;
    NSDictionary *temp2 = obj2;
        if (temp2[@"addtime"] > temp1[@"addtime"])  return (NSComparisonResult)NSOrderedAscending;
        else              return (NSComparisonResult)NSOrderedDescending;
    }];

//對數據時間 冒泡排序
    for (NSInteger i = 0; i < netArray.count; i ++)
    {
        for (NSInteger j = 1; j < netArray.count - i; j ++)
        {
            NSString *front = netArray[j - 1][@"addtime"];
            NSString *behind = netArray[j][@"addtime"];
            if ([front compare:behind] == NSOrderedDescending)
            {
                NSDictionary *temp = netArray[j - 1];
                [netArray replaceObjectAtIndex:j - 1 withObject:netArray[j]];
                [netArray replaceObjectAtIndex:j withObject:temp];
            }
        }
    }